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refactor(api)!: merge the new api changes into dev

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BREAKING CHANGE: remove the following
`prototorch/functions/*`
`prototorch/components/*`
`prototorch/modules/*`
BREAKING CHANGE: move `initializers` into the `prototorch.initializers`
namespace from the `prototorch.components` namespace
BREAKING CHANGE: `functions` and `modules` and moved into `core` and `nn`
This commit is contained in:
Jensun Ravichandran 2021-06-18 18:20:30 +02:00
commit 74d420a77d
49 changed files with 2465 additions and 2201 deletions
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4
.bumpversion.cfg
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@ -3,8 +3,8 @@ current_version = 0.5.0
commit = True
tag = True
parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)
serialize =
{major}.{minor}.{patch}
serialize = {major}.{minor}.{patch}
message = bump: {current_version} → {new_version}
[bumpversion:file:setup.py]

16
.gitignore vendored
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@ -129,14 +129,6 @@ dmypy.json
# End of https://www.gitignore.io/api/python
# ProtoFlow
core
checkpoint
logs/
saved_weights/
scratch*
# Created by https://www.gitignore.io/api/visualstudiocode
# Edit at https://www.gitignore.io/?templates=visualstudiocode
@ -154,5 +146,13 @@ scratch*
# End of https://www.gitignore.io/api/visualstudiocode
.vscode/
# Vim
*~
*.swp
*.swo
# Artifacts created by ProtoTorch
reports
artifacts
examples/_*.py
examples/_*.ipynb

10
.pre-commit-config.yaml
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@ -23,19 +23,19 @@ repos:
- id: isort
- repo: https://github.com/pre-commit/mirrors-mypy
rev: 'v0.902'
rev: v0.902
hooks:
- id: mypy
files: prototorch
additional_dependencies: [types-pkg_resources]
- repo: https://github.com/pre-commit/mirrors-yapf
rev: 'v0.31.0' # Use the sha / tag you want to point at
rev: v0.31.0
hooks:
- id: yapf
- repo: https://github.com/pre-commit/pygrep-hooks
rev: v1.9.0 # Use the ref you want to point at
rev: v1.9.0
hooks:
- id: python-use-type-annotations
- id: python-no-log-warn
@ -47,8 +47,8 @@ repos:
hooks:
- id: pyupgrade
- repo: https://github.com/jorisroovers/gitlint
rev: "v0.15.1"
- repo: https://github.com/si-cim/gitlint
rev: v0.15.2-unofficial
hooks:
- id: gitlint
args: [--contrib=CT1, --ignore=B6, --msg-filename]

7
.remarkrc Normal file
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@ -0,0 +1,7 @@
{
"plugins": [
"remark-preset-lint-recommended",
["remark-lint-list-item-indent", false],
["no-emphasis-as-header", false]
]
}

2
.travis.yml
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@ -1,7 +1,7 @@
dist: bionic
sudo: false
language: python
python: 3.8
python: 3.9
cache:
directories:
- "$HOME/.cache/pip"

10
README.md
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@ -51,14 +51,20 @@ that link not work try <https://prototorch.readthedocs.io/en/latest/>.
## Contribution
This repository contains definition for [git hooks](https://githooks.com).
[Pre-commit](https://pre-commit.com) gets installed as development dependency with prototorch.
Please install the hooks by running
[Pre-commit](https://pre-commit.com) is automatically installed as development
dependency with prototorch or you can install it manually with `pip install
pre-commit`.
Please install the hooks by running:
```bash
pre-commit install
pre-commit install --hook-type commit-msg
```
before creating the first commit.
The commit will fail if the commit message does not follow the specification
provided [here](https://www.conventionalcommits.org/en/v1.0.0/#specification).
## Bibtex
If you would like to cite the package, please use this:

96
examples/cbc_iris.py Normal file
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@ -0,0 +1,96 @@
"""ProtoTorch CBC example using 2D Iris data."""
import torch
from matplotlib import pyplot as plt
import prototorch as pt
class CBC(torch.nn.Module):
def __init__(self, data, **kwargs):
super().__init__(**kwargs)
self.components_layer = pt.components.ReasoningComponents(
distribution=[2, 1, 2],
components_initializer=pt.initializers.SSCI(data, noise=0.1),
reasonings_initializer=pt.initializers.PPRI(components_first=True),
)
def forward(self, x):
components, reasonings = self.components_layer()
sims = pt.similarities.euclidean_similarity(x, components)
probs = pt.competitions.cbcc(sims, reasonings)
return probs
class VisCBC2D():
def __init__(self, model, data):
self.model = model
self.x_train, self.y_train = pt.utils.parse_data_arg(data)
self.title = "Components Visualization"
self.fig = plt.figure(self.title)
self.border = 0.1
self.resolution = 100
self.cmap = "viridis"
def on_epoch_end(self):
x_train, y_train = self.x_train, self.y_train
_components = self.model.components_layer._components.detach()
ax = self.fig.gca()
ax.cla()
ax.set_title(self.title)
ax.axis("off")
ax.scatter(
x_train[:, 0],
x_train[:, 1],
c=y_train,
cmap=self.cmap,
edgecolor="k",
marker="o",
s=30,
)
ax.scatter(
_components[:, 0],
_components[:, 1],
c="w",
cmap=self.cmap,
edgecolor="k",
marker="D",
s=50,
)
x = torch.vstack((x_train, _components))
mesh_input, xx, yy = pt.utils.mesh2d(x, self.border, self.resolution)
with torch.no_grad():
y_pred = self.model(
torch.Tensor(mesh_input).type_as(_components)).argmax(1)
y_pred = y_pred.cpu().reshape(xx.shape)
ax.contourf(xx, yy, y_pred, cmap=self.cmap, alpha=0.35)
plt.pause(0.2)
if __name__ == "__main__":
train_ds = pt.datasets.Iris(dims=[0, 2])
train_loader = torch.utils.data.DataLoader(train_ds, batch_size=32)
model = CBC(train_ds)
optimizer = torch.optim.Adam(model.parameters(), lr=0.01)
criterion = pt.losses.MarginLoss(margin=0.1)
vis = VisCBC2D(model, train_ds)
for epoch in range(200):
correct = 0.0
for x, y in train_loader:
y_oh = torch.eye(3)[y]
y_pred = model(x)
loss = criterion(y_pred, y_oh).mean(0)
optimizer.zero_grad()
loss.backward()
optimizer.step()
correct += (y_pred.argmax(1) == y).float().sum(0)
acc = 100 * correct / len(train_ds)
print(f"Epoch: {epoch} Accuracy: {acc:05.02f}%")
vis.on_epoch_end()

55
examples/new_components.py
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@ -1,39 +1,35 @@
"""This example script shows the usage of the new components architecture.
Serialization/deserialization also works as expected.
"""
# DATASET
import torch
from sklearn.datasets import load_iris
from sklearn.preprocessing import StandardScaler
scaler = StandardScaler()
x_train, y_train = load_iris(return_X_y=True)
x_train = x_train[:, [0, 2]]
scaler.fit(x_train)
x_train = scaler.transform(x_train)
import prototorch as pt
x_train = torch.Tensor(x_train)
y_train = torch.Tensor(y_train)
num_classes = len(torch.unique(y_train))
ds = pt.datasets.Iris()
# CREATE NEW COMPONENTS
from prototorch.components import *
from prototorch.components.initializers import *
unsupervised = Components(6, SelectionInitializer(x_train))
unsupervised = pt.components.Components(
6,
initializer=pt.initializers.ZCI(2),
)
print(unsupervised())
prototypes = LabeledComponents(
(3, 2), StratifiedSelectionInitializer(x_train, y_train))
prototypes = pt.components.LabeledComponents(
(3, 2),
components_initializer=pt.initializers.SSCI(ds),
)
print(prototypes())
components = ReasoningComponents(
(3, 6), StratifiedSelectionInitializer(x_train, y_train))
print(components())
components = pt.components.ReasoningComponents(
(3, 2),
components_initializer=pt.initializers.SSCI(ds),
reasonings_initializer=pt.initializers.PPRI(),
)
print(prototypes())
# TEST SERIALIZATION
# Test Serialization
import io
save = io.BytesIO()
@ -41,25 +37,20 @@ torch.save(unsupervised, save)
save.seek(0)
serialized_unsupervised = torch.load(save)
assert torch.all(unsupervised.components == serialized_unsupervised.components
), "Serialization of Components failed."
assert torch.all(unsupervised.components == serialized_unsupervised.components)
save = io.BytesIO()
torch.save(prototypes, save)
save.seek(0)
serialized_prototypes = torch.load(save)
assert torch.all(prototypes.components == serialized_prototypes.components
), "Serialization of Components failed."
assert torch.all(prototypes.component_labels == serialized_prototypes.
component_labels), "Serialization of Components failed."
assert torch.all(prototypes.components == serialized_prototypes.components)
assert torch.all(prototypes.labels == serialized_prototypes.labels)
save = io.BytesIO()
torch.save(components, save)
save.seek(0)
serialized_components = torch.load(save)
assert torch.all(components.components == serialized_components.components
), "Serialization of Components failed."
assert torch.all(components.reasonings == serialized_components.reasonings
), "Serialization of Components failed."
assert torch.all(components.components == serialized_components.components)
assert torch.all(components.reasonings == serialized_components.reasonings)

32
prototorch/__init__.py
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@ -1,21 +1,41 @@
"""ProtoTorch package."""
"""ProtoTorch package"""
import pkgutil
from typing import List
import pkg_resources
from . import components, datasets, functions, modules, utils
from .datasets import *
from . import (
datasets,
nn,
utils,
)
from .core import (
competitions,
components,
distances,
initializers,
losses,
pooling,
similarities,
transforms,
)
# Core Setup
__version__ = "0.5.0"
__all_core__ = [
"datasets",
"functions",
"modules",
"competitions",
"components",
"core",
"datasets",
"distances",
"initializers",
"losses",
"nn",
"pooling",
"similarities",
"transforms",
"utils",
]

2
prototorch/components/__init__.py
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@ -1,2 +0,0 @@
from prototorch.components.components import *
from prototorch.components.initializers import *

270
prototorch/components/components.py
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@ -1,270 +0,0 @@
"""ProtoTorch components modules."""
import warnings
import torch
from torch.nn.parameter import Parameter
from prototorch.components.initializers import (ClassAwareInitializer,
ComponentsInitializer,
EqualLabelsInitializer,
UnequalLabelsInitializer,
ZeroReasoningsInitializer)
from .initializers import parse_data_arg
def get_labels_object(distribution):
if isinstance(distribution, dict):
if "num_classes" in distribution.keys():
labels = EqualLabelsInitializer(
distribution["num_classes"],
distribution["prototypes_per_class"])
else:
clabels = list(distribution.keys())
dist = list(distribution.values())
labels = UnequalLabelsInitializer(dist, clabels)
elif isinstance(distribution, tuple):
num_classes, prototypes_per_class = distribution
labels = EqualLabelsInitializer(num_classes, prototypes_per_class)
elif isinstance(distribution, list):
labels = UnequalLabelsInitializer(distribution)
else:
msg = f"`distribution` not understood." \
f"You have provided: {distribution=}."
raise ValueError(msg)
return labels
def _precheck_initializer(initializer):
if not isinstance(initializer, ComponentsInitializer):
emsg = f"`initializer` has to be some subtype of " \
f"{ComponentsInitializer}. " \
f"You have provided: {initializer=} instead."
raise TypeError(emsg)
class LinearMapping(torch.nn.Module):
"""LinearMapping is a learnable Mapping Matrix."""
def __init__(self,
mapping_shape=None,
initializer=None,
*,
initialized_linearmapping=None):
super().__init__()
# Ignore all initialization settings if initialized_components is given.
if initialized_linearmapping is not None:
self._register_mapping(initialized_linearmapping)
if num_components is not None or initializer is not None:
wmsg = "Arguments ignored while initializing Components"
warnings.warn(wmsg)
else:
self._initialize_mapping(mapping_shape, initializer)
@property
def mapping_shape(self):
return self._omega.shape
def _register_mapping(self, components):
self.register_parameter("_omega", Parameter(components))
def _initialize_mapping(self, mapping_shape, initializer):
_precheck_initializer(initializer)
_mapping = initializer.generate(mapping_shape)
self._register_mapping(_mapping)
@property
def mapping(self):
"""Tensor containing the component tensors."""
return self._omega.detach()
def forward(self):
return self._omega
class Components(torch.nn.Module):
"""Components is a set of learnable Tensors."""
def __init__(self,
num_components=None,
initializer=None,
*,
initialized_components=None):
super().__init__()
# Ignore all initialization settings if initialized_components is given.
if initialized_components is not None:
self._register_components(initialized_components)
if num_components is not None or initializer is not None:
wmsg = "Arguments ignored while initializing Components"
warnings.warn(wmsg)
else:
self._initialize_components(num_components, initializer)
@property
def num_components(self):
return len(self._components)
def _register_components(self, components):
self.register_parameter("_components", Parameter(components))
def _initialize_components(self, num_components, initializer):
_precheck_initializer(initializer)
_components = initializer.generate(num_components)
self._register_components(_components)
def add_components(self,
num=1,
initializer=None,
*,
initialized_components=None):
if initialized_components is not None:
_components = torch.cat([self._components, initialized_components])
else:
_precheck_initializer(initializer)
_new = initializer.generate(num)
_components = torch.cat([self._components, _new])
self._register_components(_components)
def remove_components(self, indices=None):
mask = torch.ones(self.num_components, dtype=torch.bool)
mask[indices] = False
_components = self._components[mask]
self._register_components(_components)
return mask
@property
def components(self):
"""Tensor containing the component tensors."""
return self._components.detach()
def forward(self):
return self._components
def extra_repr(self):
return f"(components): (shape: {tuple(self._components.shape)})"
class LabeledComponents(Components):
"""LabeledComponents generate a set of components and a set of labels.
Every Component has a label assigned.
"""
def __init__(self,
distribution=None,
initializer=None,
*,
initialized_components=None):
if initialized_components is not None:
components, component_labels = parse_data_arg(
initialized_components)
super().__init__(initialized_components=components)
self._register_labels(component_labels)
else:
labels = get_labels_object(distribution)
self.initial_distribution = labels.distribution
_labels = labels.generate()
super().__init__(len(_labels), initializer=initializer)
self._register_labels(_labels)
def _register_labels(self, labels):
self.register_buffer("_labels", labels)
@property
def distribution(self):
clabels, counts = torch.unique(self._labels,
sorted=True,
return_counts=True)
return dict(zip(clabels.tolist(), counts.tolist()))
def _initialize_components(self, num_components, initializer):
if isinstance(initializer, ClassAwareInitializer):
_precheck_initializer(initializer)
_components = initializer.generate(num_components,
self.initial_distribution)
self._register_components(_components)
else:
super()._initialize_components(num_components, initializer)
def add_components(self, distribution, initializer):
_precheck_initializer(initializer)
# Labels
labels = get_labels_object(distribution)
new_labels = labels.generate()
_labels = torch.cat([self._labels, new_labels])
self._register_labels(_labels)
# Components
if isinstance(initializer, ClassAwareInitializer):
_new = initializer.generate(len(new_labels), distribution)
else:
_new = initializer.generate(len(new_labels))
_components = torch.cat([self._components, _new])
self._register_components(_components)
def remove_components(self, indices=None):
# Components
mask = super().remove_components(indices)
# Labels
_labels = self._labels[mask]
self._register_labels(_labels)
@property
def component_labels(self):
"""Tensor containing the component tensors."""
return self._labels.detach()
def forward(self):
return super().forward(), self._labels
class ReasoningComponents(Components):
r"""ReasoningComponents generate a set of components and a set of reasoning matrices.
Every Component has a reasoning matrix assigned.
A reasoning matrix is a Nx2 matrix, where N is the number of Classes. The
first element is called positive reasoning :math:`p`, the second negative
reasoning :math:`n`. A components can reason in favour (positive) of a
class, against (negative) a class or not at all (neutral).
It holds that :math:`0 \leq n \leq 1`, :math:`0 \leq p \leq 1` and :math:`0
\leq n+p \leq 1`. Therefore :math:`n` and :math:`p` are two elements of a
three element probability distribution.
"""
def __init__(self,
reasonings=None,
initializer=None,
*,
initialized_components=None):
if initialized_components is not None:
components, reasonings = initialized_components
super().__init__(initialized_components=components)
self.register_parameter("_reasonings", reasonings)
else:
self._initialize_reasonings(reasonings)
super().__init__(len(self._reasonings), initializer=initializer)
def _initialize_reasonings(self, reasonings):
if isinstance(reasonings, tuple):
num_classes, num_components = reasonings
reasonings = ZeroReasoningsInitializer(num_classes, num_components)
_reasonings = reasonings.generate()
self.register_parameter("_reasonings", _reasonings)
@property
def reasonings(self):
"""Returns Reasoning Matrix.
Dimension NxCx2
"""
return self._reasonings.detach()
def forward(self):
return super().forward(), self._reasonings

233
prototorch/components/initializers.py
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@ -1,233 +0,0 @@
"""ProtoTroch Initializers."""
import warnings
from collections.abc import Iterable
from itertools import chain
import torch
from torch.utils.data import DataLoader, Dataset
def parse_data_arg(data_arg):
if isinstance(data_arg, Dataset):
data_arg = DataLoader(data_arg, batch_size=len(data_arg))
if isinstance(data_arg, DataLoader):
data = torch.tensor([])
targets = torch.tensor([])
for x, y in data_arg:
data = torch.cat([data, x])
targets = torch.cat([targets, y])
else:
data, targets = data_arg
if not isinstance(data, torch.Tensor):
wmsg = f"Converting data to {torch.Tensor}."
warnings.warn(wmsg)
data = torch.Tensor(data)
if not isinstance(targets, torch.Tensor):
wmsg = f"Converting targets to {torch.Tensor}."
warnings.warn(wmsg)
targets = torch.Tensor(targets)
return data, targets
def get_subinitializers(data, targets, clabels, subinit_type):
initializers = dict()
for clabel in clabels:
class_data = data[targets == clabel]
class_initializer = subinit_type(class_data)
initializers[clabel] = (class_initializer)
return initializers
# Components
class ComponentsInitializer(object):
def generate(self, number_of_components):
raise NotImplementedError("Subclasses should implement this!")
class DimensionAwareInitializer(ComponentsInitializer):
def __init__(self, dims):
super().__init__()
if isinstance(dims, Iterable):
self.components_dims = tuple(dims)
else:
self.components_dims = (dims, )
class OnesInitializer(DimensionAwareInitializer):
def __init__(self, dims, scale=1.0):
super().__init__(dims)
self.scale = scale
def generate(self, length):
gen_dims = (length, ) + self.components_dims
return torch.ones(gen_dims) * self.scale
class ZerosInitializer(DimensionAwareInitializer):
def generate(self, length):
gen_dims = (length, ) + self.components_dims
return torch.zeros(gen_dims)
class UniformInitializer(DimensionAwareInitializer):
def __init__(self, dims, minimum=0.0, maximum=1.0, scale=1.0):
super().__init__(dims)
self.minimum = minimum
self.maximum = maximum
self.scale = scale
def generate(self, length):
gen_dims = (length, ) + self.components_dims
return torch.ones(gen_dims).uniform_(self.minimum,
self.maximum) * self.scale
class DataAwareInitializer(ComponentsInitializer):
def __init__(self, data, transform=torch.nn.Identity()):
super().__init__()
self.data = data
self.transform = transform
def __del__(self):
del self.data
class SelectionInitializer(DataAwareInitializer):
def generate(self, length):
indices = torch.LongTensor(length).random_(0, len(self.data))
return self.transform(self.data[indices])
class MeanInitializer(DataAwareInitializer):
def generate(self, length):
mean = torch.mean(self.data, dim=0)
repeat_dim = [length] + [1] * len(mean.shape)
return self.transform(mean.repeat(repeat_dim))
class ClassAwareInitializer(DataAwareInitializer):
def __init__(self, data, transform=torch.nn.Identity()):
data, targets = parse_data_arg(data)
super().__init__(data, transform)
self.targets = targets
self.clabels = torch.unique(self.targets).int().tolist()
self.num_classes = len(self.clabels)
def _get_samples_from_initializer(self, length, dist):
if not dist:
per_class = length // self.num_classes
dist = dict(zip(self.clabels, self.num_classes * [per_class]))
if isinstance(dist, list):
dist = dict(zip(self.clabels, dist))
samples = [self.initializers[k].generate(n) for k, n in dist.items()]
out = torch.vstack(samples)
with torch.no_grad():
out = self.transform(out)
return out
def __del__(self):
del self.data
del self.targets
class StratifiedMeanInitializer(ClassAwareInitializer):
def __init__(self, data, **kwargs):
super().__init__(data, **kwargs)
self.initializers = get_subinitializers(self.data, self.targets,
self.clabels, MeanInitializer)
def generate(self, length, dist):
samples = self._get_samples_from_initializer(length, dist)
return samples
class StratifiedSelectionInitializer(ClassAwareInitializer):
def __init__(self, data, noise=None, **kwargs):
super().__init__(data, **kwargs)
self.noise = noise
self.initializers = get_subinitializers(self.data, self.targets,
self.clabels,
SelectionInitializer)
def add_noise_v1(self, x):
return x + self.noise
def add_noise_v2(self, x):
"""Shifts some dimensions of the data randomly."""
n1 = torch.rand_like(x)
n2 = torch.rand_like(x)
mask = torch.bernoulli(n1) - torch.bernoulli(n2)
return x + (self.noise * mask)
def generate(self, length, dist):
samples = self._get_samples_from_initializer(length, dist)
if self.noise is not None:
samples = self.add_noise_v1(samples)
return samples
# Omega matrix
class PcaInitializer(DataAwareInitializer):
def generate(self, shape):
(input_dim, latent_dim) = shape
(_, eigVal, eigVec) = torch.pca_lowrank(self.data, q=latent_dim)
return eigVec
# Labels
class LabelsInitializer:
def generate(self):
raise NotImplementedError("Subclasses should implement this!")
class UnequalLabelsInitializer(LabelsInitializer):
def __init__(self, dist, clabels=None):
self.dist = dist
self.clabels = clabels or range(len(self.dist))
@property
def distribution(self):
return self.dist
def generate(self):
targets = list(
chain(*[[i] * n for i, n in zip(self.clabels, self.dist)]))
return torch.LongTensor(targets)
class EqualLabelsInitializer(LabelsInitializer):
def __init__(self, classes, per_class):
self.classes = classes
self.per_class = per_class
@property
def distribution(self):
return self.classes * [self.per_class]
def generate(self):
return torch.arange(self.classes).repeat(self.per_class, 1).T.flatten()
# Reasonings
class ReasoningsInitializer:
def generate(self, length):
raise NotImplementedError("Subclasses should implement this!")
class ZeroReasoningsInitializer(ReasoningsInitializer):
def __init__(self, classes, length):
self.classes = classes
self.length = length
def generate(self):
return torch.zeros((self.length, self.classes, 2))
# Aliases
SSI = StratifiedSampleInitializer = StratifiedSelectionInitializer
SMI = StratifiedMeanInitializer
Random = RandomInitializer = UniformInitializer
Zeros = ZerosInitializer
Ones = OnesInitializer
PCA = PcaInitializer

10
prototorch/core/__init__.py Normal file
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@ -0,0 +1,10 @@
"""ProtoTorch core"""
from .competitions import *
from .components import *
from .distances import *
from .initializers import *
from .losses import *
from .pooling import *
from .similarities import *
from .transforms import *

89
prototorch/core/competitions.py Normal file
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"""ProtoTorch competitions"""
import torch
def wtac(distances: torch.Tensor, labels: torch.LongTensor):
"""Winner-Takes-All-Competition.
Returns the labels corresponding to the winners.
"""
winning_indices = torch.min(distances, dim=1).indices
winning_labels = labels[winning_indices].squeeze()
return winning_labels
def knnc(distances: torch.Tensor, labels: torch.LongTensor, k: int = 1):
"""K-Nearest-Neighbors-Competition.
Returns the labels corresponding to the winners.
"""
winning_indices = torch.topk(-distances, k=k, dim=1).indices
winning_labels = torch.mode(labels[winning_indices], dim=1).values
return winning_labels
def cbcc(detections: torch.Tensor, reasonings: torch.Tensor):
"""Classification-By-Components Competition.
Returns probability distributions over the classes.
`detections` must be of shape [batch_size, num_components].
`reasonings` must be of shape [num_components, num_classes, 2].
"""
A, B = reasonings.permute(2, 1, 0).clamp(0, 1)
pk = A
nk = (1 - A) * B
numerator = (detections @ (pk - nk).T) + nk.sum(1)
probs = numerator / (pk + nk).sum(1)
return probs
class WTAC(torch.nn.Module):
"""Winner-Takes-All-Competition Layer.
Thin wrapper over the `wtac` function.
"""
def forward(self, distances, labels):
return wtac(distances, labels)
class LTAC(torch.nn.Module):
"""Loser-Takes-All-Competition Layer.
Thin wrapper over the `wtac` function.
"""
def forward(self, probs, labels):
return wtac(-1.0 * probs, labels)
class KNNC(torch.nn.Module):
"""K-Nearest-Neighbors-Competition.
Thin wrapper over the `knnc` function.
"""
def __init__(self, k=1, **kwargs):
super().__init__(**kwargs)
self.k = k
def forward(self, distances, labels):
return knnc(distances, labels, k=self.k)
def extra_repr(self):
return f"k: {self.k}"
class CBCC(torch.nn.Module):
"""Classification-By-Components Competition.
Thin wrapper over the `cbcc` function.
"""
def forward(self, detections, reasonings):
return cbcc(detections, reasonings)

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"""ProtoTorch components"""
import inspect
from typing import Union
import torch
from torch.nn.parameter import Parameter
from ..utils import parse_distribution
from .initializers import (
AbstractClassAwareCompInitializer,
AbstractComponentsInitializer,
AbstractLabelsInitializer,
AbstractReasoningsInitializer,
LabelsInitializer,
PurePositiveReasoningsInitializer,
RandomReasoningsInitializer,
)
def validate_initializer(initializer, instanceof):
"""Check if the initializer is valid."""
if not isinstance(initializer, instanceof):
emsg = f"`initializer` has to be an instance " \
f"of some subtype of {instanceof}. " \
f"You have provided: {initializer} instead. "
helpmsg = ""
if inspect.isclass(initializer):
helpmsg = f"Perhaps you meant to say, {initializer.__name__}() " \
f"with the brackets instead of just {initializer.__name__}?"
raise TypeError(emsg + helpmsg)
return True
def gencat(ins, attr, init, *iargs, **ikwargs):
"""Generate new items and concatenate with existing items."""
new_items = init.generate(*iargs, **ikwargs)
if hasattr(ins, attr):
items = torch.cat([getattr(ins, attr), new_items])
else:
items = new_items
return items, new_items
def removeind(ins, attr, indices):
"""Remove items at specified indices."""
mask = torch.ones(len(ins), dtype=torch.bool)
mask[indices] = False
items = getattr(ins, attr)[mask]
return items, mask
def get_cikwargs(init, distribution):
"""Return appropriate key-word arguments for a component initializer."""
if isinstance(init, AbstractClassAwareCompInitializer):
cikwargs = dict(distribution=distribution)
else:
distribution = parse_distribution(distribution)
num_components = sum(distribution.values())
cikwargs = dict(num_components=num_components)
return cikwargs
class AbstractComponents(torch.nn.Module):
"""Abstract class for all components modules."""
@property
def num_components(self):
"""Current number of components."""
return len(self._components)
@property
def components(self):
"""Detached Tensor containing the components."""
return self._components.detach().cpu()
def _register_components(self, components):
self.register_parameter("_components", Parameter(components))
def extra_repr(self):
return f"components: (shape: {tuple(self._components.shape)})"
def __len__(self):
return self.num_components
class Components(AbstractComponents):
"""A set of adaptable Tensors."""
def __init__(self, num_components: int,
initializer: AbstractComponentsInitializer):
super().__init__()
self.add_components(num_components, initializer)
def add_components(self, num_components: int,
initializer: AbstractComponentsInitializer):
"""Generate and add new components."""
assert validate_initializer(initializer, AbstractComponentsInitializer)
_components, new_components = gencat(self, "_components", initializer,
num_components)
self._register_components(_components)
return new_components
def remove_components(self, indices):
"""Remove components at specified indices."""
_components, mask = removeind(self, "_components", indices)
self._register_components(_components)
return mask
def forward(self):
"""Simply return the components parameter Tensor."""
return self._components
class AbstractLabels(torch.nn.Module):
"""Abstract class for all labels modules."""
@property
def labels(self):
return self._labels.cpu()
@property
def num_labels(self):
return len(self._labels)
@property
def unique_labels(self):
return torch.unique(self._labels)
@property
def num_unique(self):
return len(self.unique_labels)
@property
def distribution(self):
unique, counts = torch.unique(self._labels,
sorted=True,
return_counts=True)
return dict(zip(unique.tolist(), counts.tolist()))
def _register_labels(self, labels):
self.register_buffer("_labels", labels)
def extra_repr(self):
r = f"num_labels: {self.num_labels}, num_unique: {self.num_unique}"
if len(self.distribution) < 11: # avoid lengthy representations
d = self.distribution
unique, counts = list(d.keys()), list(d.values())
r += f", unique: {unique}, counts: {counts}"
return r
def __len__(self):
return self.num_labels
class Labels(AbstractLabels):
"""A set of standalone labels."""
def __init__(self,
distribution: Union[dict, list, tuple],
initializer: AbstractLabelsInitializer = LabelsInitializer()):
super().__init__()
self.add_labels(distribution, initializer)
def add_labels(
self,
distribution: Union[dict, tuple, list],
initializer: AbstractLabelsInitializer = LabelsInitializer()):
"""Generate and add new labels."""
assert validate_initializer(initializer, AbstractLabelsInitializer)
_labels, new_labels = gencat(self, "_labels", initializer,
distribution)
self._register_labels(_labels)
return new_labels
def remove_labels(self, indices):
"""Remove labels at specified indices."""
_labels, mask = removeind(self, "_labels", indices)
self._register_labels(_labels)
return mask
def forward(self):
"""Simply return the labels."""
return self._labels
class LabeledComponents(AbstractComponents):
"""A set of adaptable components and corresponding unadaptable labels."""
def __init__(
self,
distribution: Union[dict, list, tuple],
components_initializer: AbstractComponentsInitializer,
labels_initializer: AbstractLabelsInitializer = LabelsInitializer()):
super().__init__()
self.add_components(distribution, components_initializer,
labels_initializer)
@property
def distribution(self):
unique, counts = torch.unique(self._labels,
sorted=True,
return_counts=True)
return dict(zip(unique.tolist(), counts.tolist()))
@property
def num_classes(self):
return len(self.distribution.keys())
@property
def labels(self):
"""Tensor containing the component labels."""
return self._labels.cpu()
def _register_labels(self, labels):
self.register_buffer("_labels", labels)
def add_components(
self,
distribution,
components_initializer,
labels_initializer: AbstractLabelsInitializer = LabelsInitializer()):
"""Generate and add new components and labels."""
assert validate_initializer(components_initializer,
AbstractComponentsInitializer)
assert validate_initializer(labels_initializer,
AbstractLabelsInitializer)
cikwargs = get_cikwargs(components_initializer, distribution)
_components, new_components = gencat(self, "_components",
components_initializer,
**cikwargs)
_labels, new_labels = gencat(self, "_labels", labels_initializer,
distribution)
self._register_components(_components)
self._register_labels(_labels)
return new_components, new_labels
def remove_components(self, indices):
"""Remove components and labels at specified indices."""
_components, mask = removeind(self, "_components", indices)
_labels, mask = removeind(self, "_labels", indices)
self._register_components(_components)
self._register_labels(_labels)
return mask
def forward(self):
"""Simply return the components parameter Tensor and labels."""
return self._components, self._labels
class Reasonings(torch.nn.Module):
"""A set of standalone reasoning matrices.
The `reasonings` tensor is of shape [num_components, num_classes, 2].
"""
def __init__(
self,
distribution: Union[dict, list, tuple],
initializer:
AbstractReasoningsInitializer = RandomReasoningsInitializer()):
super().__init__()
@property
def num_classes(self):
return self._reasonings.shape[1]
@property
def reasonings(self):
"""Tensor containing the reasoning matrices."""
return self._reasonings.detach().cpu()
def _register_reasonings(self, reasonings):
self.register_buffer("_reasonings", reasonings)
def add_reasonings(
self,
distribution: Union[dict, list, tuple],
initializer:
AbstractReasoningsInitializer = RandomReasoningsInitializer()):
"""Generate and add new reasonings."""
assert validate_initializer(initializer, AbstractReasoningsInitializer)
_reasonings, new_reasonings = gencat(self, "_reasonings", initializer,
distribution)
self._register_reasonings(_reasonings)
return new_reasonings
def remove_reasonings(self, indices):
"""Remove reasonings at specified indices."""
_reasonings, mask = removeind(self, "_reasonings", indices)
self._register_reasonings(_reasonings)
return mask
def forward(self):
"""Simply return the reasonings."""
return self._reasonings
class ReasoningComponents(AbstractComponents):
r"""A set of components and a corresponding adapatable reasoning matrices.
Every component has its own reasoning matrix.
A reasoning matrix is an Nx2 matrix, where N is the number of classes. The
first element is called positive reasoning :math:`p`, the second negative
reasoning :math:`n`. A components can reason in favour (positive) of a
class, against (negative) a class or not at all (neutral).
It holds that :math:`0 \leq n \leq 1`, :math:`0 \leq p \leq 1` and :math:`0
\leq n+p \leq 1`. Therefore :math:`n` and :math:`p` are two elements of a
three element probability distribution.
"""
def __init__(
self,
distribution: Union[dict, list, tuple],
components_initializer: AbstractComponentsInitializer,
reasonings_initializer:
AbstractReasoningsInitializer = PurePositiveReasoningsInitializer()):
super().__init__()
self.add_components(distribution, components_initializer,
reasonings_initializer)
@property
def num_classes(self):
return self._reasonings.shape[1]
@property
def reasonings(self):
"""Tensor containing the reasoning matrices."""
return self._reasonings.detach().cpu()
@property
def reasoning_matrices(self):
"""Reasoning matrices for each class."""
with torch.no_grad():
A, B = self._reasonings.permute(2, 1, 0).clamp(0, 1)
pk = A
nk = (1 - pk) * B
ik = 1 - pk - nk
matrices = torch.stack([pk, nk, ik], dim=-1).permute(1, 2, 0)
return matrices.cpu()
def _register_reasonings(self, reasonings):
self.register_parameter("_reasonings", Parameter(reasonings))
def add_components(self, distribution, components_initializer,
reasonings_initializer: AbstractReasoningsInitializer):
"""Generate and add new components and reasonings."""
assert validate_initializer(components_initializer,
AbstractComponentsInitializer)
assert validate_initializer(reasonings_initializer,
AbstractReasoningsInitializer)
cikwargs = get_cikwargs(components_initializer, distribution)
_components, new_components = gencat(self, "_components",
components_initializer,
**cikwargs)
_reasonings, new_reasonings = gencat(self, "_reasonings",
reasonings_initializer,
distribution)
self._register_components(_components)
self._register_reasonings(_reasonings)
return new_components, new_reasonings
def remove_components(self, indices):
"""Remove components and reasonings at specified indices."""
_components, mask = removeind(self, "_components", indices)
_reasonings, mask = removeind(self, "_reasonings", indices)
self._register_components(_components)
self._register_reasonings(_reasonings)
return mask
def forward(self):
"""Simply return the components and reasonings."""
return self._components, self._reasonings

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"""ProtoTorch distances"""
import torch
def squared_euclidean_distance(x, y):
r"""Compute the squared Euclidean distance between :math:`\bm x` and :math:`\bm y`.
Compute :math:`{\langle \bm x - \bm y \rangle}_2`
**Alias:**
``prototorch.functions.distances.sed``
"""
x, y = [arr.view(arr.size(0), -1) for arr in (x, y)]
expanded_x = x.unsqueeze(dim=1)
batchwise_difference = y - expanded_x
differences_raised = torch.pow(batchwise_difference, 2)
distances = torch.sum(differences_raised, axis=2)
return distances
def euclidean_distance(x, y):
r"""Compute the Euclidean distance between :math:`x` and :math:`y`.
Compute :math:`\sqrt{{\langle \bm x - \bm y \rangle}_2}`
:returns: Distance Tensor of shape :math:`X \times Y`
:rtype: `torch.tensor`
"""
x, y = [arr.view(arr.size(0), -1) for arr in (x, y)]
distances_raised = squared_euclidean_distance(x, y)
distances = torch.sqrt(distances_raised)
return distances
def euclidean_distance_v2(x, y):
x, y = [arr.view(arr.size(0), -1) for arr in (x, y)]
diff = y - x.unsqueeze(1)
pairwise_distances = (diff @ diff.permute((0, 2, 1))).sqrt()
# Passing `dim1=-2` and `dim2=-1` to `diagonal()` takes the
# batch diagonal. See:
# https://pytorch.org/docs/stable/generated/torch.diagonal.html
distances = torch.diagonal(pairwise_distances, dim1=-2, dim2=-1)
# print(f"{diff.shape=}") # (nx, ny, ndim)
# print(f"{pairwise_distances.shape=}") # (nx, ny, ny)
# print(f"{distances.shape=}") # (nx, ny)
return distances
def lpnorm_distance(x, y, p):
r"""Calculate the lp-norm between :math:`\bm x` and :math:`\bm y`.
Also known as Minkowski distance.
Compute :math:`{\| \bm x - \bm y \|}_p`.
Calls ``torch.cdist``
:param p: p parameter of the lp norm
"""
x, y = [arr.view(arr.size(0), -1) for arr in (x, y)]
distances = torch.cdist(x, y, p=p)
return distances
def omega_distance(x, y, omega):
r"""Omega distance.
Compute :math:`{\| \Omega \bm x - \Omega \bm y \|}_p`
:param `torch.tensor` omega: Two dimensional matrix
"""
x, y = [arr.view(arr.size(0), -1) for arr in (x, y)]
projected_x = x @ omega
projected_y = y @ omega
distances = squared_euclidean_distance(projected_x, projected_y)
return distances
def lomega_distance(x, y, omegas):
r"""Localized Omega distance.
Compute :math:`{\| \Omega_k \bm x - \Omega_k \bm y_k \|}_p`
:param `torch.tensor` omegas: Three dimensional matrix
"""
x, y = [arr.view(arr.size(0), -1) for arr in (x, y)]
projected_x = x @ omegas
projected_y = torch.diagonal(y @ omegas).T
expanded_y = torch.unsqueeze(projected_y, dim=1)
batchwise_difference = expanded_y - projected_x
differences_squared = batchwise_difference**2
distances = torch.sum(differences_squared, dim=2)
distances = distances.permute(1, 0)
return distances
# Aliases
sed = squared_euclidean_distance

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"""ProtoTorch code initializers"""
import warnings
from abc import ABC, abstractmethod
from collections.abc import Iterable
from typing import (
Callable,
Type,
Union,
)
import torch
from ..utils import parse_data_arg, parse_distribution
# Components
class AbstractComponentsInitializer(ABC):
"""Abstract class for all components initializers."""
...
class LiteralCompInitializer(AbstractComponentsInitializer):
"""'Generate' the provided components.
Use this to 'generate' pre-initialized components elsewhere.
"""
def __init__(self, components):
self.components = components
def generate(self, num_components: int = 0):
"""Ignore `num_components` and simply return `self.components`."""
if not isinstance(self.components, torch.Tensor):
wmsg = f"Converting components to {torch.Tensor}..."
warnings.warn(wmsg)
self.components = torch.Tensor(self.components)
return self.components
class ShapeAwareCompInitializer(AbstractComponentsInitializer):
"""Abstract class for all dimension-aware components initializers."""
def __init__(self, shape: Union[Iterable, int]):
if isinstance(shape, Iterable):
self.component_shape = tuple(shape)
else:
self.component_shape = (shape, )
@abstractmethod
def generate(self, num_components: int):
...
class ZerosCompInitializer(ShapeAwareCompInitializer):
"""Generate zeros corresponding to the components shape."""
def generate(self, num_components: int):
components = torch.zeros((num_components, ) + self.component_shape)
return components
class OnesCompInitializer(ShapeAwareCompInitializer):
"""Generate ones corresponding to the components shape."""
def generate(self, num_components: int):
components = torch.ones((num_components, ) + self.component_shape)
return components
class FillValueCompInitializer(OnesCompInitializer):
"""Generate components with the provided `fill_value`."""
def __init__(self, shape, fill_value: float = 1.0):
super().__init__(shape)
self.fill_value = fill_value
def generate(self, num_components: int):
ones = super().generate(num_components)
components = ones.fill_(self.fill_value)
return components
class UniformCompInitializer(OnesCompInitializer):
"""Generate components by sampling from a continuous uniform distribution."""
def __init__(self, shape, minimum=0.0, maximum=1.0, scale=1.0):
super().__init__(shape)
self.minimum = minimum
self.maximum = maximum
self.scale = scale
def generate(self, num_components: int):
ones = super().generate(num_components)
components = self.scale * ones.uniform_(self.minimum, self.maximum)
return components
class RandomNormalCompInitializer(OnesCompInitializer):
"""Generate components by sampling from a standard normal distribution."""
def __init__(self, shape, shift=0.0, scale=1.0):
super().__init__(shape)
self.shift = shift
self.scale = scale
def generate(self, num_components: int):
ones = super().generate(num_components)
components = self.scale * (torch.randn_like(ones) + self.shift)
return components
class AbstractDataAwareCompInitializer(AbstractComponentsInitializer):
"""Abstract class for all data-aware components initializers.
Components generated by data-aware components initializers inherit the shape
of the provided data.
`data` has to be a torch tensor.
"""
def __init__(self,
data: torch.Tensor,
noise: float = 0.0,
transform: Callable = torch.nn.Identity()):
self.data = data
self.noise = noise
self.transform = transform
def generate_end_hook(self, samples):
drift = torch.rand_like(samples) * self.noise
components = self.transform(samples + drift)
return components
@abstractmethod
def generate(self, num_components: int):
...
return self.generate_end_hook(...)
def __del__(self):
del self.data
class DataAwareCompInitializer(AbstractDataAwareCompInitializer):
"""'Generate' the components from the provided data."""
def generate(self, num_components: int = 0):
"""Ignore `num_components` and simply return transformed `self.data`."""
components = self.generate_end_hook(self.data)
return components
class SelectionCompInitializer(AbstractDataAwareCompInitializer):
"""Generate components by uniformly sampling from the provided data."""
def generate(self, num_components: int):
indices = torch.LongTensor(num_components).random_(0, len(self.data))
samples = self.data[indices]
components = self.generate_end_hook(samples)
return components
class MeanCompInitializer(AbstractDataAwareCompInitializer):
"""Generate components by computing the mean of the provided data."""
def generate(self, num_components: int):
mean = self.data.mean(dim=0)
repeat_dim = [num_components] + [1] * len(mean.shape)
samples = mean.repeat(repeat_dim)
components = self.generate_end_hook(samples)
return components
class AbstractClassAwareCompInitializer(AbstractComponentsInitializer):
"""Abstract class for all class-aware components initializers.
Components generated by class-aware components initializers inherit the shape
of the provided data.
`data` could be a torch Dataset or DataLoader or a list/tuple of data and
target tensors.
"""
def __init__(self,
data,
noise: float = 0.0,
transform: Callable = torch.nn.Identity()):
self.data, self.targets = parse_data_arg(data)
self.noise = noise
self.transform = transform
self.clabels = torch.unique(self.targets).int().tolist()
self.num_classes = len(self.clabels)
def generate_end_hook(self, samples):
drift = torch.rand_like(samples) * self.noise
components = self.transform(samples + drift)
return components
@abstractmethod
def generate(self, distribution: Union[dict, list, tuple]):
...
return self.generate_end_hook(...)
def __del__(self):
del self.data
del self.targets
class ClassAwareCompInitializer(AbstractClassAwareCompInitializer):
"""'Generate' components from provided data and requested distribution."""
def generate(self, distribution: Union[dict, list, tuple]):
"""Ignore `distribution` and simply return transformed `self.data`."""
components = self.generate_end_hook(self.data)
return components
class AbstractStratifiedCompInitializer(AbstractClassAwareCompInitializer):
"""Abstract class for all stratified components initializers."""
@property
@abstractmethod
def subinit_type(self) -> Type[AbstractDataAwareCompInitializer]:
...
def generate(self, distribution: Union[dict, list, tuple]):
distribution = parse_distribution(distribution)
components = torch.tensor([])
for k, v in distribution.items():
stratified_data = self.data[self.targets == k]
initializer = self.subinit_type(
stratified_data,
noise=self.noise,
transform=self.transform,
)
samples = initializer.generate(num_components=v)
components = torch.cat([components, samples])
return components
class StratifiedSelectionCompInitializer(AbstractStratifiedCompInitializer):
"""Generate components using stratified sampling from the provided data."""
@property
def subinit_type(self):
return SelectionCompInitializer
class StratifiedMeanCompInitializer(AbstractStratifiedCompInitializer):
"""Generate components at stratified means of the provided data."""
@property
def subinit_type(self):
return MeanCompInitializer
# Labels
class AbstractLabelsInitializer(ABC):
"""Abstract class for all labels initializers."""
@abstractmethod
def generate(self, distribution: Union[dict, list, tuple]):
...
class LiteralLabelsInitializer(AbstractLabelsInitializer):
"""'Generate' the provided labels.
Use this to 'generate' pre-initialized labels elsewhere.
"""
def __init__(self, labels):
self.labels = labels
def generate(self, distribution: Union[dict, list, tuple]):
"""Ignore `distribution` and simply return `self.labels`.
Convert to long tensor, if necessary.
"""
labels = self.labels
if not isinstance(labels, torch.LongTensor):
wmsg = f"Converting labels to {torch.LongTensor}..."
warnings.warn(wmsg)
labels = torch.LongTensor(labels)
return labels
class DataAwareLabelsInitializer(AbstractLabelsInitializer):
"""'Generate' the labels from a torch Dataset."""
def __init__(self, data):
self.data, self.targets = parse_data_arg(data)
def generate(self, distribution: Union[dict, list, tuple]):
"""Ignore `num_components` and simply return `self.targets`."""
return self.targets
class LabelsInitializer(AbstractLabelsInitializer):
"""Generate labels from `distribution`."""
def generate(self, distribution: Union[dict, list, tuple]):
distribution = parse_distribution(distribution)
labels_list = []
for k, v in distribution.items():
labels_list.extend([k] * v)
labels = torch.LongTensor(labels_list)
return labels
class OneHotLabelsInitializer(LabelsInitializer):
"""Generate one-hot-encoded labels from `distribution`."""
def generate(self, distribution: Union[dict, list, tuple]):
distribution = parse_distribution(distribution)
num_classes = len(distribution.keys())
# this breaks if class labels are not [0,...,nclasses]
labels = torch.eye(num_classes)[super().generate(distribution)]
return labels
# Reasonings
class AbstractReasoningsInitializer(ABC):
"""Abstract class for all reasonings initializers."""
def __init__(self, components_first: bool = True):
self.components_first = components_first
def compute_shape(self, distribution):
distribution = parse_distribution(distribution)
num_components = sum(distribution.values())
num_classes = len(distribution.keys())
return (num_components, num_classes, 2)
def generate_end_hook(self, reasonings):
if not self.components_first:
reasonings = reasonings.permute(2, 1, 0)
return reasonings
@abstractmethod
def generate(self, distribution: Union[dict, list, tuple]):
...
return self.generate_end_hook(...)
class LiteralReasoningsInitializer(AbstractReasoningsInitializer):
"""'Generate' the provided reasonings.
Use this to 'generate' pre-initialized reasonings elsewhere.
"""
def __init__(self, reasonings, **kwargs):
super().__init__(**kwargs)
self.reasonings = reasonings
def generate(self, distribution: Union[dict, list, tuple]):
"""Ignore `distributuion` and simply return self.reasonings."""
reasonings = self.reasonings
if not isinstance(reasonings, torch.Tensor):
wmsg = f"Converting reasonings to {torch.Tensor}..."
warnings.warn(wmsg)
reasonings = torch.Tensor(reasonings)
reasonings = self.generate_end_hook(reasonings)
return reasonings
class ZerosReasoningsInitializer(AbstractReasoningsInitializer):
"""Reasonings are all initialized with zeros."""
def generate(self, distribution: Union[dict, list, tuple]):
shape = self.compute_shape(distribution)
reasonings = torch.zeros(*shape)
reasonings = self.generate_end_hook(reasonings)
return reasonings
class OnesReasoningsInitializer(AbstractReasoningsInitializer):
"""Reasonings are all initialized with ones."""
def generate(self, distribution: Union[dict, list, tuple]):
shape = self.compute_shape(distribution)
reasonings = torch.ones(*shape)
reasonings = self.generate_end_hook(reasonings)
return reasonings
class RandomReasoningsInitializer(AbstractReasoningsInitializer):
"""Reasonings are randomly initialized."""
def __init__(self, minimum=0.4, maximum=0.6, **kwargs):
super().__init__(**kwargs)
self.minimum = minimum
self.maximum = maximum
def generate(self, distribution: Union[dict, list, tuple]):
shape = self.compute_shape(distribution)
reasonings = torch.ones(*shape).uniform_(self.minimum, self.maximum)
reasonings = self.generate_end_hook(reasonings)
return reasonings
class PurePositiveReasoningsInitializer(AbstractReasoningsInitializer):
"""Each component reasons positively for exactly one class."""
def generate(self, distribution: Union[dict, list, tuple]):
num_components, num_classes, _ = self.compute_shape(distribution)
A = OneHotLabelsInitializer().generate(distribution)
B = torch.zeros(num_components, num_classes)
reasonings = torch.stack([A, B], dim=-1)
reasonings = self.generate_end_hook(reasonings)
return reasonings
# Transforms
class AbstractTransformInitializer(ABC):
"""Abstract class for all transform initializers."""
...
class AbstractLinearTransformInitializer(AbstractTransformInitializer):
"""Abstract class for all linear transform initializers."""
def __init__(self, out_dim_first: bool = False):
self.out_dim_first = out_dim_first
def generate_end_hook(self, weights):
if self.out_dim_first:
weights = weights.permute(1, 0)
return weights
@abstractmethod
def generate(self, in_dim: int, out_dim: int):
...
return self.generate_end_hook(...)
class ZerosLinearTransformInitializer(AbstractLinearTransformInitializer):
"""Initialize a matrix with zeros."""
def generate(self, in_dim: int, out_dim: int):
weights = torch.zeros(in_dim, out_dim)
return self.generate_end_hook(weights)
class OnesLinearTransformInitializer(AbstractLinearTransformInitializer):
"""Initialize a matrix with ones."""
def generate(self, in_dim: int, out_dim: int):
weights = torch.ones(in_dim, out_dim)
return self.generate_end_hook(weights)
class EyeTransformInitializer(AbstractLinearTransformInitializer):
"""Initialize a matrix with the largest possible identity matrix."""
def generate(self, in_dim: int, out_dim: int):
weights = torch.zeros(in_dim, out_dim)
I = torch.eye(min(in_dim, out_dim))
weights[:I.shape[0], :I.shape[1]] = I
return self.generate_end_hook(weights)
class AbstractDataAwareLTInitializer(AbstractLinearTransformInitializer):
"""Abstract class for all data-aware linear transform initializers."""
def __init__(self,
data: torch.Tensor,
noise: float = 0.0,
transform: Callable = torch.nn.Identity()):
self.data = data
self.noise = noise
self.transform = transform
def generate_end_hook(self, weights: torch.Tensor):
drift = torch.rand_like(weights) * self.noise
weights = self.transform(weights + drift)
if self.out_dim_first:
weights = weights.permute(1, 0)
return weights
class PCALinearTransformInitializer(AbstractDataAwareLTInitializer):
"""Initialize a matrix with Eigenvectors from the data."""
@abstractmethod
def generate(self, in_dim: int, out_dim: int):
_, _, weights = torch.pca_lowrank(self.data, q=out_dim)
return self.generate_end_hook(weights)
# Aliases - Components
CACI = ClassAwareCompInitializer
DACI = DataAwareCompInitializer
FVCI = FillValueCompInitializer
LCI = LiteralCompInitializer
MCI = MeanCompInitializer
OCI = OnesCompInitializer
RNCI = RandomNormalCompInitializer
SCI = SelectionCompInitializer
SMCI = StratifiedMeanCompInitializer
SSCI = StratifiedSelectionCompInitializer
UCI = UniformCompInitializer
ZCI = ZerosCompInitializer
# Aliases - Labels
DLI = DataAwareLabelsInitializer
LI = LabelsInitializer
LLI = LiteralLabelsInitializer
OHLI = OneHotLabelsInitializer
# Aliases - Reasonings
LRI = LiteralReasoningsInitializer
ORI = OnesReasoningsInitializer
PPRI = PurePositiveReasoningsInitializer
RRI = RandomReasoningsInitializer
ZRI = ZerosReasoningsInitializer
# Aliases - Transforms
Eye = EyeTransformInitializer
OLTI = OnesLinearTransformInitializer
ZLTI = ZerosLinearTransformInitializer
PCALTI = PCALinearTransformInitializer

79
prototorch/functions/losses.py → prototorch/core/losses.py
View File

@ -1,8 +1,11 @@
"""ProtoTorch loss functions."""
"""ProtoTorch losses"""
import torch
from ..nn.activations import get_activation
# Helpers
def _get_matcher(targets, labels):
"""Returns a boolean tensor."""
matcher = torch.eq(targets.unsqueeze(dim=1), labels)
@ -28,6 +31,7 @@ def _get_dp_dm(distances, targets, plabels, with_indices=False):
return dp.values, dm.values
# GLVQ
def glvq_loss(distances, target_labels, prototype_labels):
"""GLVQ loss function with support for one-hot labels."""
dp, dm = _get_dp_dm(distances, target_labels, prototype_labels)
@ -92,3 +96,76 @@ def rslvq_loss(probabilities, targets, prototype_labels):
likelihood = correct / whole
log_likelihood = torch.log(likelihood)
return -1.0 * log_likelihood
def margin_loss(y_pred, y_true, margin=0.3):
"""Compute the margin loss."""
dp = torch.sum(y_true * y_pred, dim=-1)
dm = torch.max(y_pred - y_true, dim=-1).values
return torch.nn.functional.relu(dm - dp + margin)
class GLVQLoss(torch.nn.Module):
def __init__(self, margin=0.0, squashing="identity", beta=10, **kwargs):
super().__init__(**kwargs)
self.margin = margin
self.squashing = get_activation(squashing)
self.beta = torch.tensor(beta)
def forward(self, outputs, targets):
distances, plabels = outputs
mu = glvq_loss(distances, targets, prototype_labels=plabels)
batch_loss = self.squashing(mu + self.margin, beta=self.beta)
return torch.sum(batch_loss, dim=0)
class MarginLoss(torch.nn.modules.loss._Loss):
def __init__(self,
margin=0.3,
size_average=None,
reduce=None,
reduction="mean"):
super().__init__(size_average, reduce, reduction)
self.margin = margin
def forward(self, y_pred, y_true):
return margin_loss(y_pred, y_true, self.margin)
class NeuralGasEnergy(torch.nn.Module):
def __init__(self, lm, **kwargs):
super().__init__(**kwargs)
self.lm = lm
def forward(self, d):
order = torch.argsort(d, dim=1)
ranks = torch.argsort(order, dim=1)
cost = torch.sum(self._nghood_fn(ranks, self.lm) * d)
return cost, order
def extra_repr(self):
return f"lambda: {self.lm}"
@staticmethod
def _nghood_fn(rankings, lm):
return torch.exp(-rankings / lm)
class GrowingNeuralGasEnergy(NeuralGasEnergy):
def __init__(self, topology_layer, **kwargs):
super().__init__(**kwargs)
self.topology_layer = topology_layer
@staticmethod
def _nghood_fn(rankings, topology):
winner = rankings[:, 0]
weights = torch.zeros_like(rankings, dtype=torch.float)
weights[torch.arange(rankings.shape[0]), winner] = 1.0
neighbours = topology.get_neighbours(winner)
weights[neighbours] = 0.1
return weights

26
prototorch/functions/pooling.py → prototorch/core/pooling.py
View File

@ -1,4 +1,4 @@
"""ProtoTorch pooling functions."""
"""ProtoTorch pooling"""
from typing import Callable
@ -78,3 +78,27 @@ def stratified_prod_pooling(values: torch.Tensor,
fn=lambda x: torch.prod(x, dim=1, keepdim=True).squeeze(),
fill_value=1.0)
return winning_values
class StratifiedSumPooling(torch.nn.Module):
"""Thin wrapper over the `stratified_sum_pooling` function."""
def forward(self, values, labels):
return stratified_sum_pooling(values, labels)
class StratifiedProdPooling(torch.nn.Module):
"""Thin wrapper over the `stratified_prod_pooling` function."""
def forward(self, values, labels):
return stratified_prod_pooling(values, labels)
class StratifiedMinPooling(torch.nn.Module):
"""Thin wrapper over the `stratified_min_pooling` function."""
def forward(self, values, labels):
return stratified_min_pooling(values, labels)
class StratifiedMaxPooling(torch.nn.Module):
"""Thin wrapper over the `stratified_max_pooling` function."""
def forward(self, values, labels):
return stratified_max_pooling(values, labels)

15
prototorch/functions/similarities.py → prototorch/core/similarities.py
View File

@ -1,7 +1,19 @@
"""ProtoTorch similarity functions."""
"""ProtoTorch similarities."""
import torch
from .distances import euclidean_distance
def gaussian(x, variance=1.0):
return torch.exp(-(x * x) / (2 * variance))
def euclidean_similarity(x, y, variance=1.0):
distances = euclidean_distance(x, y)
similarities = gaussian(distances, variance)
return similarities
def cosine_similarity(x, y):
"""Compute the cosine similarity between :math:`x` and :math:`y`.
@ -9,6 +21,7 @@ def cosine_similarity(x, y):
Expected dimension of x is 2.
Expected dimension of y is 2.
"""
x, y = [arr.view(arr.size(0), -1) for arr in (x, y)]
norm_x = x.pow(2).sum(1).sqrt()
norm_y = y.pow(2).sum(1).sqrt()
norm_mat = norm_x.unsqueeze(-1) @ norm_y.unsqueeze(-1).T

43
prototorch/core/transforms.py Normal file
View File

@ -0,0 +1,43 @@
"""ProtoTorch transforms"""
import torch
from torch.nn.parameter import Parameter
from .initializers import (
AbstractLinearTransformInitializer,
EyeTransformInitializer,
)
class LinearTransform(torch.nn.Module):
def __init__(
self,
in_dim: int,
out_dim: int,
initializer:
AbstractLinearTransformInitializer = EyeTransformInitializer()):
super().__init__()
self.set_weights(in_dim, out_dim, initializer)
@property
def weights(self):
return self._weights.detach().cpu()
def _register_weights(self, weights):
self.register_parameter("_weights", Parameter(weights))
def set_weights(
self,
in_dim: int,
out_dim: int,
initializer:
AbstractLinearTransformInitializer = EyeTransformInitializer()):
weights = initializer.generate(in_dim, out_dim)
self._register_weights(weights)
def forward(self, x):
return x @ self.weights.T
# Aliases
Omega = LinearTransform

10
prototorch/datasets/__init__.py
View File

@ -1,6 +1,12 @@
"""ProtoTorch datasets."""
"""ProtoTorch datasets"""
from .abstract import NumpyDataset
from .sklearn import Blobs, Circles, Iris, Moons, Random
from .sklearn import (
Blobs,
Circles,
Iris,
Moons,
Random,
)
from .spiral import Spiral
from .tecator import Tecator

25
prototorch/datasets/abstract.py
View File

@ -1,10 +1,11 @@
"""ProtoTorch abstract dataset classes.
"""ProtoTorch abstract dataset classes
Based on `torchvision.VisionDataset` and `torchvision.MNIST`
Based on `torchvision.VisionDataset` and `torchvision.MNIST`.
For the original code, see:
https://github.com/pytorch/vision/blob/master/torchvision/datasets/vision.py
https://github.com/pytorch/vision/blob/master/torchvision/datasets/mnist.py
"""
import os
@ -12,15 +13,6 @@ import os
import torch
class NumpyDataset(torch.utils.data.TensorDataset):
"""Create a PyTorch TensorDataset from NumPy arrays."""
def __init__(self, data, targets):
self.data = torch.Tensor(data)
self.targets = torch.LongTensor(targets)
tensors = [self.data, self.targets]
super().__init__(*tensors)
class Dataset(torch.utils.data.Dataset):
"""Abstract dataset class to be inherited."""
@ -44,7 +36,7 @@ class ProtoDataset(Dataset):
training_file = "training.pt"
test_file = "test.pt"
def __init__(self, root, train=True, download=True, verbose=True):
def __init__(self, root="", train=True, download=True, verbose=True):
super().__init__(root)
self.train = train # training set or test set
self.verbose = verbose
@ -96,3 +88,12 @@ class ProtoDataset(Dataset):
def _download(self):
raise NotImplementedError
class NumpyDataset(torch.utils.data.TensorDataset):
"""Create a PyTorch TensorDataset from NumPy arrays."""
def __init__(self, data, targets):
self.data = torch.Tensor(data)
self.targets = torch.LongTensor(targets)
tensors = [self.data, self.targets]
super().__init__(*tensors)

5
prototorch/functions/__init__.py
View File

@ -1,5 +0,0 @@
"""ProtoTorch functions."""
from .activations import identity, sigmoid_beta, swish_beta
from .competitions import knnc, wtac
from .pooling import *

28
prototorch/functions/competitions.py
View File

@ -1,28 +0,0 @@
"""ProtoTorch competition functions."""
import torch
def wtac(distances: torch.Tensor,
labels: torch.LongTensor) -> (torch.LongTensor):
"""Winner-Takes-All-Competition.
Returns the labels corresponding to the winners.
"""
winning_indices = torch.min(distances, dim=1).indices
winning_labels = labels[winning_indices].squeeze()
return winning_labels
def knnc(distances: torch.Tensor,
labels: torch.LongTensor,
k: int = 1) -> (torch.LongTensor):
"""K-Nearest-Neighbors-Competition.
Returns the labels corresponding to the winners.
"""
winning_indices = torch.topk(-distances, k=k, dim=1).indices
winning_labels = torch.mode(labels[winning_indices], dim=1).values
return winning_labels

259
prototorch/functions/distances.py
View File

@ -1,259 +0,0 @@
"""ProtoTorch distance functions."""
import numpy as np
import torch
from prototorch.functions.helper import (_check_shapes, _int_and_mixed_shape,
equal_int_shape, get_flat)
def squared_euclidean_distance(x, y):
r"""Compute the squared Euclidean distance between :math:`\bm x` and :math:`\bm y`.
Compute :math:`{\langle \bm x - \bm y \rangle}_2`
**Alias:**
``prototorch.functions.distances.sed``
"""
x, y = get_flat(x, y)
expanded_x = x.unsqueeze(dim=1)
batchwise_difference = y - expanded_x
differences_raised = torch.pow(batchwise_difference, 2)
distances = torch.sum(differences_raised, axis=2)
return distances
def euclidean_distance(x, y):
r"""Compute the Euclidean distance between :math:`x` and :math:`y`.
Compute :math:`\sqrt{{\langle \bm x - \bm y \rangle}_2}`
:returns: Distance Tensor of shape :math:`X \times Y`
:rtype: `torch.tensor`
"""
x, y = get_flat(x, y)
distances_raised = squared_euclidean_distance(x, y)
distances = torch.sqrt(distances_raised)
return distances
def euclidean_distance_v2(x, y):
x, y = get_flat(x, y)
diff = y - x.unsqueeze(1)
pairwise_distances = (diff @ diff.permute((0, 2, 1))).sqrt()
# Passing `dim1=-2` and `dim2=-1` to `diagonal()` takes the
# batch diagonal. See:
# https://pytorch.org/docs/stable/generated/torch.diagonal.html
distances = torch.diagonal(pairwise_distances, dim1=-2, dim2=-1)
# print(f"{diff.shape=}") # (nx, ny, ndim)
# print(f"{pairwise_distances.shape=}") # (nx, ny, ny)
# print(f"{distances.shape=}") # (nx, ny)
return distances
def lpnorm_distance(x, y, p):
r"""Calculate the lp-norm between :math:`\bm x` and :math:`\bm y`.
Also known as Minkowski distance.
Compute :math:`{\| \bm x - \bm y \|}_p`.
Calls ``torch.cdist``
:param p: p parameter of the lp norm
"""
x, y = get_flat(x, y)
distances = torch.cdist(x, y, p=p)
return distances
def omega_distance(x, y, omega):
r"""Omega distance.
Compute :math:`{\| \Omega \bm x - \Omega \bm y \|}_p`
:param `torch.tensor` omega: Two dimensional matrix
"""
x, y = get_flat(x, y)
projected_x = x @ omega
projected_y = y @ omega
distances = squared_euclidean_distance(projected_x, projected_y)
return distances
def lomega_distance(x, y, omegas):
r"""Localized Omega distance.
Compute :math:`{\| \Omega_k \bm x - \Omega_k \bm y_k \|}_p`
:param `torch.tensor` omegas: Three dimensional matrix
"""
x, y = get_flat(x, y)
projected_x = x @ omegas
projected_y = torch.diagonal(y @ omegas).T
expanded_y = torch.unsqueeze(projected_y, dim=1)
batchwise_difference = expanded_y - projected_x
differences_squared = batchwise_difference**2
distances = torch.sum(differences_squared, dim=2)
distances = distances.permute(1, 0)
return distances
def euclidean_distance_matrix(x, y, squared=False, epsilon=1e-10):
r"""Computes an euclidean distances matrix given two distinct vectors.
last dimension must be the vector dimension!
compute the distance via the identity of the dot product. This avoids the memory overhead due to the subtraction!
- ``x.shape = (number_of_x_vectors, vector_dim)``
- ``y.shape = (number_of_y_vectors, vector_dim)``
output: matrix of distances (number_of_x_vectors, number_of_y_vectors)
"""
for tensor in [x, y]:
if tensor.ndim != 2:
raise ValueError(
"The tensor dimension must be two. You provide: tensor.ndim=" +
str(tensor.ndim) + ".")
if not equal_int_shape([tuple(x.shape)[1]], [tuple(y.shape)[1]]):
raise ValueError(
"The vector shape must be equivalent in both tensors. You provide: tuple(y.shape)[1]="
+ str(tuple(x.shape)[1]) + " and tuple(y.shape)(y)[1]=" +
str(tuple(y.shape)[1]) + ".")
y = torch.transpose(y)
diss = (torch.sum(x**2, axis=1, keepdims=True) - 2 * torch.dot(x, y) +
torch.sum(y**2, axis=0, keepdims=True))
if not squared:
if epsilon == 0:
diss = torch.sqrt(diss)
else:
diss = torch.sqrt(torch.max(diss, epsilon))
return diss
def tangent_distance(signals, protos, subspaces, squared=False, epsilon=1e-10):
r"""Tangent distances based on the tensorflow implementation of Sascha Saralajews
For more info about Tangen distances see
DOI:10.1109/IJCNN.2016.7727534.
The subspaces is always assumed as transposed and must be orthogonal!
For local non sparse signals subspaces must be provided!
- shape(signals): batch x proto_number x channels x dim1 x dim2 x ... x dimN
- shape(protos): proto_number x dim1 x dim2 x ... x dimN
- shape(subspaces): (optional [proto_number]) x prod(dim1 * dim2 * ... * dimN) x prod(projected_atom_shape)
subspace should be orthogonalized
Pytorch implementation of Sascha Saralajew's tensorflow code.
Translation by Christoph Raab
"""
signal_shape, signal_int_shape = _int_and_mixed_shape(signals)
proto_shape, proto_int_shape = _int_and_mixed_shape(protos)
subspace_int_shape = tuple(subspaces.shape)
# check if the shapes are correct
_check_shapes(signal_int_shape, proto_int_shape)
atom_axes = list(range(3, len(signal_int_shape)))
# for sparse signals, we use the memory efficient implementation
if signal_int_shape[1] == 1:
signals = torch.reshape(signals, [-1, np.prod(signal_shape[3:])])
if len(atom_axes) > 1:
protos = torch.reshape(protos, [proto_shape[0], -1])
if subspaces.ndim == 2:
# clean solution without map if the matrix_scope is global
projectors = torch.eye(subspace_int_shape[-2]) - torch.dot(
subspaces, torch.transpose(subspaces))
projected_signals = torch.dot(signals, projectors)
projected_protos = torch.dot(protos, projectors)
diss = euclidean_distance_matrix(projected_signals,
projected_protos,
squared=squared,
epsilon=epsilon)
diss = torch.reshape(
diss, [signal_shape[0], signal_shape[2], proto_shape[0]])
return torch.permute(diss, [0, 2, 1])
else:
# no solution without map possible --> memory efficient but slow!
projectors = torch.eye(subspace_int_shape[-2]) - torch.bmm(
subspaces,
subspaces) # K.batch_dot(subspaces, subspaces, [2, 2])
projected_protos = (protos @ subspaces
).T # K.batch_dot(projectors, protos, [1, 1]))
def projected_norm(projector):
return torch.sum(torch.dot(signals, projector)**2, axis=1)
diss = (torch.transpose(map(projected_norm, projectors)) -
2 * torch.dot(signals, projected_protos) +
torch.sum(projected_protos**2, axis=0, keepdims=True))
if not squared:
if epsilon == 0:
diss = torch.sqrt(diss)
else:
diss = torch.sqrt(torch.max(diss, epsilon))
diss = torch.reshape(
diss, [signal_shape[0], signal_shape[2], proto_shape[0]])
return torch.permute(diss, [0, 2, 1])
else:
signals = signals.permute([0, 2, 1] + atom_axes)
diff = signals - protos
# global tangent space
if subspaces.ndim == 2:
# Scope Projectors
projectors = subspaces #
# Scope: Tangentspace Projections
diff = torch.reshape(
diff, (signal_shape[0] * signal_shape[2], signal_shape[1], -1))
projected_diff = diff @ projectors
projected_diff = torch.reshape(
projected_diff,
(signal_shape[0], signal_shape[2], signal_shape[1]) +
signal_shape[3:],
)
diss = torch.norm(projected_diff, 2, dim=-1)
return diss.permute([0, 2, 1])
# local tangent spaces
else:
# Scope: Calculate Projectors
projectors = subspaces
# Scope: Tangentspace Projections
diff = torch.reshape(
diff, (signal_shape[0] * signal_shape[2], signal_shape[1], -1))
diff = diff.permute([1, 0, 2])
projected_diff = torch.bmm(diff, projectors)
projected_diff = torch.reshape(
projected_diff,
(signal_shape[1], signal_shape[0], signal_shape[2]) +
signal_shape[3:],
)
diss = torch.norm(projected_diff, 2, dim=-1)
return diss.permute([1, 0, 2]).squeeze(-1)
# Aliases
sed = squared_euclidean_distance

94
prototorch/functions/helper.py
View File

@ -1,94 +0,0 @@
import torch
def get_flat(*args):
rv = [x.view(x.size(0), -1) for x in args]
return rv
def calculate_prototype_accuracy(y_pred, y_true, plabels):
"""Computes the accuracy of a prototype based model.
via Winner-Takes-All rule.
Requirement:
y_pred.shape == y_true.shape
unique(y_pred) in plabels
"""
with torch.no_grad():
idx = torch.argmin(y_pred, axis=1)
return torch.true_divide(torch.sum(y_true == plabels[idx]),
len(y_pred)) * 100
def predict_label(y_pred, plabels):
r""" Predicts labels given a prediction of a prototype based model.
"""
with torch.no_grad():
return plabels[torch.argmin(y_pred, 1)]
def mixed_shape(inputs):
if not torch.is_tensor(inputs):
raise ValueError("Input must be a tensor.")
else:
int_shape = list(inputs.shape)
# sometimes int_shape returns mixed integer types
int_shape = [int(i) if i is not None else i for i in int_shape]
tensor_shape = inputs.shape
for i, s in enumerate(int_shape):
if s is None:
int_shape[i] = tensor_shape[i]
return tuple(int_shape)
def equal_int_shape(shape_1, shape_2):
if not isinstance(shape_1,
(tuple, list)) or not isinstance(shape_2, (tuple, list)):
raise ValueError("Input shapes must list or tuple.")
for shape in [shape_1, shape_2]:
if not all([isinstance(x, int) or x is None for x in shape]):
raise ValueError(
"Input shapes must be list or tuple of int and None values.")
if len(shape_1) != len(shape_2):
return False
else:
for axis, value in enumerate(shape_1):
if value is not None and shape_2[axis] not in {value, None}:
return False
return True
def _check_shapes(signal_int_shape, proto_int_shape):
if len(signal_int_shape) < 4:
raise ValueError(
"The number of signal dimensions must be >=4. You provide: " +
str(len(signal_int_shape)))
if len(proto_int_shape) < 2:
raise ValueError(
"The number of proto dimensions must be >=2. You provide: " +
str(len(proto_int_shape)))
if not equal_int_shape(signal_int_shape[3:], proto_int_shape[1:]):
raise ValueError(
"The atom shape of signals must be equal protos. You provide: signals.shape[3:]="
+ str(signal_int_shape[3:]) + " != protos.shape[1:]=" +
str(proto_int_shape[1:]))
# not a sparse signal
if signal_int_shape[1] != 1:
if not equal_int_shape(signal_int_shape[1:2], proto_int_shape[0:1]):
raise ValueError(
"If the signal is not sparse, the number of prototypes must be equal in signals and "
"protos. You provide: " + str(signal_int_shape[1]) + " != " +
str(proto_int_shape[0]))
return True
def _int_and_mixed_shape(tensor):
shape = mixed_shape(tensor)
int_shape = tuple(i if isinstance(i, int) else None for i in shape)
return shape, int_shape

107
prototorch/functions/initializers.py
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@ -1,107 +0,0 @@
"""ProtoTorch initialization functions."""
from itertools import chain
import torch
INITIALIZERS = dict()
def register_initializer(function):
"""Add the initializer to the registry."""
INITIALIZERS[function.__name__] = function
return function
def labels_from(distribution, one_hot=True):
"""Takes a distribution tensor and returns a labels tensor."""
num_classes = distribution.shape[0]
llist = [[i] * n for i, n in zip(range(num_classes), distribution)]
# labels = [l for cl in llist for l in cl] # flatten the list of lists
flat_llist = list(chain(*llist)) # flatten label list with itertools.chain
plabels = torch.tensor(flat_llist, requires_grad=False)
if one_hot:
return torch.eye(num_classes)[plabels]
return plabels
@register_initializer
def ones(x_train, y_train, prototype_distribution, one_hot=True):
num_protos = torch.sum(prototype_distribution)
protos = torch.ones(num_protos, *x_train.shape[1:])
plabels = labels_from(prototype_distribution, one_hot)
return protos, plabels
@register_initializer
def zeros(x_train, y_train, prototype_distribution, one_hot=True):
num_protos = torch.sum(prototype_distribution)
protos = torch.zeros(num_protos, *x_train.shape[1:])
plabels = labels_from(prototype_distribution, one_hot)
return protos, plabels
@register_initializer
def rand(x_train, y_train, prototype_distribution, one_hot=True):
num_protos = torch.sum(prototype_distribution)
protos = torch.rand(num_protos, *x_train.shape[1:])
plabels = labels_from(prototype_distribution, one_hot)
return protos, plabels
@register_initializer
def randn(x_train, y_train, prototype_distribution, one_hot=True):
num_protos = torch.sum(prototype_distribution)
protos = torch.randn(num_protos, *x_train.shape[1:])
plabels = labels_from(prototype_distribution, one_hot)
return protos, plabels
@register_initializer
def stratified_mean(x_train, y_train, prototype_distribution, one_hot=True):
num_protos = torch.sum(prototype_distribution)
pdim = x_train.shape[1]
protos = torch.empty(num_protos, pdim)
plabels = labels_from(prototype_distribution, one_hot)
for i, label in enumerate(plabels):
matcher = torch.eq(label.unsqueeze(dim=0), y_train)
if one_hot:
num_classes = y_train.size()[1]
matcher = torch.eq(torch.sum(matcher, dim=-1), num_classes)
xl = x_train[matcher]
mean_xl = torch.mean(xl, dim=0)
protos[i] = mean_xl
plabels = labels_from(prototype_distribution, one_hot=one_hot)
return protos, plabels
@register_initializer
def stratified_random(x_train,
y_train,
prototype_distribution,
one_hot=True,
epsilon=1e-7):
num_protos = torch.sum(prototype_distribution)
pdim = x_train.shape[1]
protos = torch.empty(num_protos, pdim)
plabels = labels_from(prototype_distribution, one_hot)
for i, label in enumerate(plabels):
matcher = torch.eq(label.unsqueeze(dim=0), y_train)
if one_hot:
num_classes = y_train.size()[1]
matcher = torch.eq(torch.sum(matcher, dim=-1), num_classes)
xl = x_train[matcher]
rand_index = torch.zeros(1).long().random_(0, xl.shape[0] - 1)
random_xl = xl[rand_index]
protos[i] = random_xl + epsilon
plabels = labels_from(prototype_distribution, one_hot=one_hot)
return protos, plabels
def get_initializer(funcname):
"""Deserialize the initializer."""
if callable(funcname):
return funcname
if funcname in INITIALIZERS:
return INITIALIZERS.get(funcname)
raise NameError(f"Initializer {funcname} was not found.")

35
prototorch/functions/normalization.py
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# -*- coding: utf-8 -*-
from __future__ import absolute_import, division, print_function
import torch
def orthogonalization(tensors):
r""" Orthogonalization of a given tensor via polar decomposition.
"""
u, _, v = torch.svd(tensors, compute_uv=True)
u_shape = tuple(list(u.shape))
v_shape = tuple(list(v.shape))
# reshape to (num x N x M)
u = torch.reshape(u, (-1, u_shape[-2], u_shape[-1]))
v = torch.reshape(v, (-1, v_shape[-2], v_shape[-1]))
out = u @ v.permute([0, 2, 1])
out = torch.reshape(out, u_shape[:-1] + (v_shape[-2], ))
return out
def trace_normalization(tensors):
r""" Trace normalization
"""
epsilon = torch.tensor([1e-10], dtype=torch.float64)
# Scope trace_normalization
constant = torch.trace(tensors)
if epsilon != 0:
constant = torch.max(constant, epsilon)
return tensors / constant

32
prototorch/functions/transforms.py
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@ -1,32 +0,0 @@
import torch
# Functions
def gaussian(distances, variance):
return torch.exp(-(distances * distances) / (2 * variance))
def rank_scaled_gaussian(distances, lambd):
order = torch.argsort(distances, dim=1)
ranks = torch.argsort(order, dim=1)
return torch.exp(-torch.exp(-ranks / lambd) * distances)
# Modules
class GaussianPrior(torch.nn.Module):
def __init__(self, variance):
super().__init__()
self.variance = variance
def forward(self, distances):
return gaussian(distances, self.variance)
class RankScaledGaussianPrior(torch.nn.Module):
def __init__(self, lambd):
super().__init__()
self.lambd = lambd
def forward(self, distances):
return rank_scaled_gaussian(distances, self.lambd)

5
prototorch/modules/__init__.py
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@ -1,5 +0,0 @@
"""ProtoTorch modules."""
from .competitions import *
from .pooling import *
from .wrappers import LambdaLayer, LossLayer

42
prototorch/modules/competitions.py
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@ -1,42 +0,0 @@
"""ProtoTorch Competition Modules."""
import torch
from prototorch.functions.competitions import knnc, wtac
class WTAC(torch.nn.Module):
"""Winner-Takes-All-Competition Layer.
Thin wrapper over the `wtac` function.
"""
def forward(self, distances, labels):
return wtac(distances, labels)
class LTAC(torch.nn.Module):
"""Loser-Takes-All-Competition Layer.
Thin wrapper over the `wtac` function.
"""
def forward(self, probs, labels):
return wtac(-1.0 * probs, labels)
class KNNC(torch.nn.Module):
"""K-Nearest-Neighbors-Competition.
Thin wrapper over the `knnc` function.
"""
def __init__(self, k=1, **kwargs):
super().__init__(**kwargs)
self.k = k
def forward(self, distances, labels):
return knnc(distances, labels, k=self.k)
def extra_repr(self):
return f"k: {self.k}"

59
prototorch/modules/losses.py
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@ -1,59 +0,0 @@
"""ProtoTorch losses."""
import torch
from prototorch.functions.activations import get_activation
from prototorch.functions.losses import glvq_loss
class GLVQLoss(torch.nn.Module):
def __init__(self, margin=0.0, squashing="identity", beta=10, **kwargs):
super().__init__(**kwargs)
self.margin = margin
self.squashing = get_activation(squashing)
self.beta = torch.tensor(beta)
def forward(self, outputs, targets):
distances, plabels = outputs
mu = glvq_loss(distances, targets, prototype_labels=plabels)
batch_loss = self.squashing(mu + self.margin, beta=self.beta)
return torch.sum(batch_loss, dim=0)
class NeuralGasEnergy(torch.nn.Module):
def __init__(self, lm, **kwargs):
super().__init__(**kwargs)
self.lm = lm
def forward(self, d):
order = torch.argsort(d, dim=1)
ranks = torch.argsort(order, dim=1)
cost = torch.sum(self._nghood_fn(ranks, self.lm) * d)
return cost, order
def extra_repr(self):
return f"lambda: {self.lm}"
@staticmethod
def _nghood_fn(rankings, lm):
return torch.exp(-rankings / lm)
class GrowingNeuralGasEnergy(NeuralGasEnergy):
def __init__(self, topology_layer, **kwargs):
super().__init__(**kwargs)
self.topology_layer = topology_layer
@staticmethod
def _nghood_fn(rankings, topology):
winner = rankings[:, 0]
weights = torch.zeros_like(rankings, dtype=torch.float)
weights[torch.arange(rankings.shape[0]), winner] = 1.0
neighbours = topology.get_neighbours(winner)
weights[neighbours] = 0.1
return weights

170
prototorch/modules/models.py
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@ -1,170 +0,0 @@
import torch
from torch import nn
from prototorch.components import LabeledComponents, StratifiedMeanInitializer
from prototorch.functions.distances import euclidean_distance_matrix
from prototorch.functions.normalization import orthogonalization
class GTLVQ(nn.Module):
r""" Generalized Tangent Learning Vector Quantization
Parameters
----------
num_classes: int
Number of classes of the given classification problem.
subspace_data: torch.tensor of shape (n_batch,feature_dim,feature_dim)
Subspace data for the point approximation, required
prototype_data: torch.tensor of shape (n_init_data,feature_dim) (optional)
prototype data for initalization of the prototypes used in GTLVQ.
subspace_size: int (default=256,optional)
Subspace dimension of the Projectors. Currently only supported
with tagnent_projection_type=global.
tangent_projection_type: string
Specifies the tangent projection type
options: local
local_proj
global
local: computes the tangent distances without emphasizing projected
data. Only distances are available
local_proj: computs tangent distances and returns the projected data
for further use. Be careful: data is repeated by number of prototypes
global: Number of subspaces is set to one and every prototypes
uses the same.
prototypes_per_class: int (default=2,optional)
Number of prototypes per class
feature_dim: int (default=256)
Dimensionality of the feature space specified as integer.
Prototype dimension.
Notes
-----
The GTLVQ [1] is a prototype-based classification learning model. The
GTLVQ uses the Tangent-Distances for a local point approximation
of an assumed data manifold via prototypial representations.
The GTLVQ requires subspace projectors for transforming the data
and prototypes into the affine subspace. Every prototype is
equipped with a specific subpspace and represents a point
approximation of the assumed manifold.
In practice prototypes and data are projected on this manifold
and pairwise euclidean distance computes.
References
----------
.. [1] Saralajew, Sascha; Villmann, Thomas: Transfer learning
in classification based on manifolc. models and its relation
to tangent metric learning. In: 2017 International Joint
Conference on Neural Networks (IJCNN).
Bd. 2017-May : IEEE, 2017, S. 1756–1765
"""
def __init__(
self,
num_classes,
subspace_data=None,
prototype_data=None,
subspace_size=256,
tangent_projection_type="local",
prototypes_per_class=2,
feature_dim=256,
):
super(GTLVQ, self).__init__()
self.num_protos = num_classes * prototypes_per_class
self.num_protos_class = prototypes_per_class
self.subspace_size = feature_dim if subspace_size is None else subspace_size
self.feature_dim = feature_dim
self.num_classes = num_classes
cls_initializer = StratifiedMeanInitializer(prototype_data)
cls_distribution = {
"num_classes": num_classes,
"prototypes_per_class": prototypes_per_class,
}
self.cls = LabeledComponents(cls_distribution, cls_initializer)
if subspace_data is None:
raise ValueError("Init Data must be specified!")
self.tpt = tangent_projection_type
with torch.no_grad():
if self.tpt == "local":
self.init_local_subspace(subspace_data, subspace_size,
self.num_protos)
elif self.tpt == "global":
self.init_gobal_subspace(subspace_data, subspace_size)
else:
self.subspaces = None
def forward(self, x):
if self.tpt == "local":
dis = self.local_tangent_distances(x)
elif self.tpt == "gloabl":
dis = self.global_tangent_distances(x)
else:
dis = (x @ self.cls.prototypes.T) / (
torch.norm(x, dim=1, keepdim=True) @ torch.norm(
self.cls.prototypes, dim=1, keepdim=True).T)
return dis
def init_gobal_subspace(self, data, num_subspaces):
_, _, v = torch.svd(data)
subspace = (torch.eye(v.shape[0]) - (v @ v.T)).T
subspaces = subspace[:, :num_subspaces]
self.subspaces = nn.Parameter(subspaces, requires_grad=True)
def init_local_subspace(self, data, num_subspaces, num_protos):
data = data - torch.mean(data, dim=0)
_, _, v = torch.svd(data, some=False)
v = v[:, :num_subspaces]
subspaces = v.unsqueeze(0).repeat_interleave(num_protos, 0)
self.subspaces = nn.Parameter(subspaces, requires_grad=True)
def global_tangent_distances(self, x):
# Tangent Projection
x, projected_prototypes = (
x @ self.subspaces,
self.cls.prototypes @ self.subspaces,
)
# Euclidean Distance
return euclidean_distance_matrix(x, projected_prototypes)
def local_tangent_distances(self, x):
# Tangent Distance
x = x.unsqueeze(1).expand(x.size(0), self.cls.num_components,
x.size(-1))
protos = self.cls()[0].unsqueeze(0).expand(x.size(0),
self.cls.num_components,
x.size(-1))
projectors = torch.eye(
self.subspaces.shape[-2], device=x.device) - torch.bmm(
self.subspaces, self.subspaces.permute([0, 2, 1]))
diff = (x - protos)
diff = diff.permute([1, 0, 2])
diff = torch.bmm(diff, projectors)
diff = torch.norm(diff, 2, dim=-1).T
return diff
def get_parameters(self):
return {
"params": self.cls.components,
}, {
"params": self.subspaces
}
def orthogonalize_subspace(self):
if self.subspaces is not None:
with torch.no_grad():
ortho_subpsaces = (orthogonalization(self.subspaces)
if self.tpt == "global" else
torch.nn.init.orthogonal_(self.subspaces))
self.subspaces.copy_(ortho_subpsaces)

32
prototorch/modules/pooling.py
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@ -1,32 +0,0 @@
"""ProtoTorch Pooling Modules."""
import torch
from prototorch.functions.pooling import (stratified_max_pooling,
stratified_min_pooling,
stratified_prod_pooling,
stratified_sum_pooling)
class StratifiedSumPooling(torch.nn.Module):
"""Thin wrapper over the `stratified_sum_pooling` function."""
def forward(self, values, labels):
return stratified_sum_pooling(values, labels)
class StratifiedProdPooling(torch.nn.Module):
"""Thin wrapper over the `stratified_prod_pooling` function."""
def forward(self, values, labels):
return stratified_prod_pooling(values, labels)
class StratifiedMinPooling(torch.nn.Module):
"""Thin wrapper over the `stratified_min_pooling` function."""
def forward(self, values, labels):
return stratified_min_pooling(values, labels)
class StratifiedMaxPooling(torch.nn.Module):
"""Thin wrapper over the `stratified_max_pooling` function."""
def forward(self, values, labels):
return stratified_max_pooling(values, labels)

4
prototorch/nn/__init__.py Normal file
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@ -0,0 +1,4 @@
"""ProtoTorch Neural Network Module"""
from .activations import *
from .wrappers import *

10
prototorch/functions/activations.py → prototorch/nn/activations.py
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@ -1,4 +1,4 @@
"""ProtoTorch activation functions."""
"""ProtoTorch activations"""
import torch
@ -57,6 +57,10 @@ def get_activation(funcname):
"""Deserialize the activation function."""
if callable(funcname):
return funcname
if funcname in ACTIVATIONS:
elif funcname in ACTIVATIONS:
return ACTIVATIONS.get(funcname)
raise NameError(f"Activation {funcname} was not found.")
else:
emsg = f"Unable to find matching function for `{funcname}` " \
f"in `prototorch.nn.activations`. "
helpmsg = f"Possible values are {list(ACTIVATIONS.keys())}."
raise NameError(emsg + helpmsg)

2
prototorch/modules/wrappers.py → prototorch/nn/wrappers.py
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@ -1,4 +1,4 @@
"""ProtoTorch Wrappers."""
"""ProtoTorch wrappers."""
import torch

8
prototorch/utils/__init__.py
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@ -0,0 +1,8 @@
"""ProtoFlow utils module"""
from .colors import hex_to_rgb, rgb_to_hex
from .utils import (
mesh2d,
parse_data_arg,
parse_distribution,
)

46
prototorch/utils/celluloid.py
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@ -1,46 +0,0 @@
"""Easy matplotlib animation. From https://github.com/jwkvam/celluloid."""
from collections import defaultdict
from typing import Dict, List
from matplotlib.animation import ArtistAnimation
from matplotlib.artist import Artist
from matplotlib.figure import Figure
__version__ = "0.2.0"
class Camera:
"""Make animations easier."""
def __init__(self, figure: Figure) -> None:
"""Create camera from matplotlib figure."""
self._figure = figure
# need to keep track off artists for each axis
self._offsets: Dict[str, Dict[int, int]] = {
k: defaultdict(int)
for k in
["collections", "patches", "lines", "texts", "artists", "images"]
}
self._photos: List[List[Artist]] = []
def snap(self) -> List[Artist]:
"""Capture current state of the figure."""
frame_artists: List[Artist] = []
for i, axis in enumerate(self._figure.axes):
if axis.legend_ is not None:
axis.add_artist(axis.legend_)
for name in self._offsets:
new_artists = getattr(axis, name)[self._offsets[name][i]:]
frame_artists += new_artists
self._offsets[name][i] += len(new_artists)
self._photos.append(frame_artists)
return frame_artists
def animate(self, *args, **kwargs) -> ArtistAnimation:
"""Animate the snapshots taken.
Uses matplotlib.animation.ArtistAnimation
Returns
-------
ArtistAnimation
"""
return ArtistAnimation(self._figure, self._photos, *args, **kwargs)

85
prototorch/utils/colors.py
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@ -1,78 +1,15 @@
"""ProtoFlow color utilities."""
import matplotlib.lines as mlines
from matplotlib import cm
from matplotlib.colors import Normalize, to_hex, to_rgb
"""ProtoFlow color utilities"""
def color_scheme(n,
cmap="viridis",
form="hex",
tikz=False,
zero_indexed=False):
"""Return *n* colors from the color scheme.
Arguments:
n (int): number of colors to return
Keyword Arguments:
cmap (str): Name of a matplotlib `colormap\
<https://matplotlib.org/3.1.1/gallery/color/colormap_reference.html>`_.
form (str): Colorformat (supports "hex" and "rgb").
tikz (bool): Output as `TikZ <https://github.com/pgf-tikz/pgf>`_
command.
zero_indexed (bool): Use zero indexing for output array.
Returns:
(list): List of colors
"""
cmap = cm.get_cmap(cmap)
colornorm = Normalize(vmin=1, vmax=n)
hex_map = dict()
rgb_map = dict()
for cl in range(1, n + 1):
if zero_indexed:
hex_map[cl - 1] = to_hex(cmap(colornorm(cl)))
rgb_map[cl - 1] = to_rgb(cmap(colornorm(cl)))
else:
hex_map[cl] = to_hex(cmap(colornorm(cl)))
rgb_map[cl] = to_rgb(cmap(colornorm(cl)))
if tikz:
for k, v in rgb_map.items():
print(f"\\definecolor{{color-{k}}}{{rgb}}{{{v[0]},{v[1]},{v[2]}}}")
if form == "hex":
return hex_map
elif form == "rgb":
return rgb_map
else:
return hex_map
def hex_to_rgb(hex_values):
for v in hex_values:
v = v.lstrip('#')
lv = len(v)
c = [int(v[i:i + lv // 3], 16) for i in range(0, lv, lv // 3)]
yield c
def get_legend_handles(labels, marker="dots", zero_indexed=False):
"""Return matplotlib legend handles and colors."""
handles = list()
n = len(labels)
colors = color_scheme(n,
cmap="viridis",
form="hex",
zero_indexed=zero_indexed)
for label, color in zip(labels, colors.values()):
if marker == "dots":
handle = mlines.Line2D(
[],
[],
color="white",
markerfacecolor=color,
marker="o",
markersize=10,
markeredgecolor="k",
label=label,
)
else:
handle = mlines.Line2D([], [],
color=color,
marker="",
markersize=15,
label=label)
handles.append(handle)
return handles, colors
def rgb_to_hex(rgb_values):
for v in rgb_values:
c = "%02x%02x%02x" % tuple(v)
yield c

104
prototorch/utils/utils.py Normal file
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"""ProtoFlow utilities"""
import warnings
from collections.abc import Iterable
from typing import Union
import numpy as np
import torch
from torch.utils.data import DataLoader, Dataset
def mesh2d(x=None, border: float = 1.0, resolution: int = 100):
if x is not None:
x_shift = border * np.ptp(x[:, 0])
y_shift = border * np.ptp(x[:, 1])
x_min, x_max = x[:, 0].min() - x_shift, x[:, 0].max() + x_shift
y_min, y_max = x[:, 1].min() - y_shift, x[:, 1].max() + y_shift
else:
x_min, x_max = -border, border
y_min, y_max = -border, border
xx, yy = np.meshgrid(np.linspace(x_min, x_max, resolution),
np.linspace(y_min, y_max, resolution))
mesh = np.c_[xx.ravel(), yy.ravel()]
return mesh, xx, yy
def distribution_from_list(list_dist: list[int],
clabels: Iterable[int] = None):
clabels = clabels or list(range(len(list_dist)))
distribution = dict(zip(clabels, list_dist))
return distribution
def parse_distribution(user_distribution,
clabels: Iterable[int] = None) -> dict[int, int]:
"""Parse user-provided distribution.
Return a dictionary with integer keys that represent the class labels and
values that denote the number of components/prototypes with that class
label.
The argument `user_distribution` could be any one of a number of allowed
formats. If it is a Python list, it is assumed that there are as many
entries in this list as there are classes, and the value at each index of
this list describes the number of prototypes for that particular class. So,
[1, 1, 1] implies that we have three classes with one prototype per class.
If it is a Python tuple, a shorthand of (num_classes, prototypes_per_class)
is assumed. If it is a Python dictionary, the key-value pairs describe the
class label and the number of prototypes for that class respectively. So,
{0: 2, 1: 2, 2: 2} implies that we have three classes with labels {1, 2,
3}, each equipped with two prototypes. If however, the dictionary contains
the keys "num_classes" and "per_class", they are parsed to use their values
as one might expect.
"""
if isinstance(user_distribution, dict):
if "num_classes" in user_distribution.keys():
num_classes = int(user_distribution["num_classes"])
per_class = int(user_distribution["per_class"])
return distribution_from_list([per_class] * num_classes, clabels)
else:
return user_distribution
elif isinstance(user_distribution, tuple):
assert len(user_distribution) == 2
num_classes, per_class = user_distribution
num_classes, per_class = int(num_classes), int(per_class)
return distribution_from_list([per_class] * num_classes, clabels)
elif isinstance(user_distribution, list):
return distribution_from_list(user_distribution, clabels)
else:
msg = f"`distribution` was not understood." \
f"You have provided: {user_distribution}."
raise ValueError(msg)
def parse_data_arg(data_arg: Union[Dataset, DataLoader, list, tuple]):
"""Return data and target as torch tensors."""
if isinstance(data_arg, Dataset):
if hasattr(data_arg, "__len__"):
ds_size = len(data_arg) # type: ignore
loader = DataLoader(data_arg, batch_size=ds_size)
data, targets = next(iter(loader))
else:
emsg = f"Dataset {data_arg} is not sized (`__len__` unimplemented)."
raise TypeError(emsg)
elif isinstance(data_arg, DataLoader):
data = torch.tensor([])
targets = torch.tensor([])
for x, y in data_arg:
data = torch.cat([data, x])
targets = torch.cat([targets, y])
else:
assert len(data_arg) == 2
data, targets = data_arg
if not isinstance(data, torch.Tensor):
wmsg = f"Converting data to {torch.Tensor}..."
warnings.warn(wmsg)
data = torch.Tensor(data)
if not isinstance(targets, torch.LongTensor):
wmsg = f"Converting targets to {torch.LongTensor}..."
warnings.warn(wmsg)
targets = torch.LongTensor(targets)
return data, targets

15
setup.cfg Normal file
View File

@ -0,0 +1,15 @@
[pylint]
disable =
too-many-arguments,
too-few-public-methods,
fixme,
[pycodestyle]
max-line-length = 79
[isort]
multi_line_output = 3
include_trailing_comma = True
force_grid_wrap = 3
use_parentheses = True
line_length = 79

3
setup.py
View File

@ -61,8 +61,9 @@ setup(
license="MIT",
install_requires=INSTALL_REQUIRES,
extras_require={
"docs": DOCS,
"datasets": DATASETS,
"dev": DEV,
"docs": DOCS,
"examples": EXAMPLES,
"tests": TESTS,
"all": ALL,

26
tests/test_components.py
View File

@ -1,26 +0,0 @@
"""ProtoTorch components test suite."""
import torch
import prototorch as pt
def test_labcomps_zeros_init():
protos = torch.zeros(3, 2)
c = pt.components.LabeledComponents(
distribution=[1, 1, 1],
initializer=pt.components.Zeros(2),
)
assert (c.components == protos).any() == True
def test_labcomps_warmstart():
protos = torch.randn(3, 2)
plabels = torch.tensor([1, 2, 3])
c = pt.components.LabeledComponents(
distribution=[1, 1, 1],
initializer=None,
initialized_components=[protos, plabels],
)
assert (c.components == protos).any() == True
assert (c.component_labels == plabels).any() == True

760
tests/test_core.py Normal file
View File

@ -0,0 +1,760 @@
"""ProtoTorch core test suite"""
import unittest
import numpy as np
import pytest
import torch
import prototorch as pt
from prototorch.utils import parse_distribution
# Utils
def test_parse_distribution_dict_0():
distribution = {"num_classes": 1, "per_class": 0}
distribution = parse_distribution(distribution)
assert distribution == {0: 0}
def test_parse_distribution_dict_1():
distribution = dict(num_classes=3, per_class=2)
distribution = parse_distribution(distribution)
assert distribution == {0: 2, 1: 2, 2: 2}
def test_parse_distribution_dict_2():
distribution = {0: 1, 2: 2, -1: 3}
distribution = parse_distribution(distribution)
assert distribution == {0: 1, 2: 2, -1: 3}
def test_parse_distribution_tuple():
distribution = (2, 3)
distribution = parse_distribution(distribution)
assert distribution == {0: 3, 1: 3}
def test_parse_distribution_list():
distribution = [1, 1, 0, 2]
distribution = parse_distribution(distribution)
assert distribution == {0: 1, 1: 1, 2: 0, 3: 2}
def test_parse_distribution_custom_labels():
distribution = [1, 1, 0, 2]
clabels = [1, 2, 5, 3]
distribution = parse_distribution(distribution, clabels)
assert distribution == {1: 1, 2: 1, 5: 0, 3: 2}
# Components initializers
def test_literal_comp_generate():
protos = torch.rand(4, 3, 5, 5)
c = pt.initializers.LiteralCompInitializer(protos)
components = c.generate([])
assert torch.allclose(components, protos)
def test_literal_comp_generate_from_list():
protos = [[0, 1], [2, 3], [4, 5]]
c = pt.initializers.LiteralCompInitializer(protos)
with pytest.warns(UserWarning):
components = c.generate([])
assert torch.allclose(components, torch.Tensor(protos))
def test_shape_aware_raises_error():
with pytest.raises(TypeError):
_ = pt.initializers.ShapeAwareCompInitializer(shape=(2, ))
def test_data_aware_comp_generate():
protos = torch.rand(4, 3, 5, 5)
c = pt.initializers.DataAwareCompInitializer(protos)
components = c.generate(num_components="IgnoreMe!")
assert torch.allclose(components, protos)
def test_class_aware_comp_generate():
protos = torch.rand(4, 2, 3, 5, 5)
plabels = torch.tensor([0, 0, 1, 1]).long()
c = pt.initializers.ClassAwareCompInitializer([protos, plabels])
components = c.generate(distribution=[])
assert torch.allclose(components, protos)
def test_zeros_comp_generate():
shape = (3, 5, 5)
c = pt.initializers.ZerosCompInitializer(shape)
components = c.generate(num_components=4)
assert torch.allclose(components, torch.zeros(4, 3, 5, 5))
def test_ones_comp_generate():
c = pt.initializers.OnesCompInitializer(2)
components = c.generate(num_components=3)
assert torch.allclose(components, torch.ones(3, 2))
def test_fill_value_comp_generate():
c = pt.initializers.FillValueCompInitializer(2, 0.0)
components = c.generate(num_components=3)
assert torch.allclose(components, torch.zeros(3, 2))
def test_uniform_comp_generate_min_max_bound():
c = pt.initializers.UniformCompInitializer(2, -1.0, 1.0)
components = c.generate(num_components=1024)
assert components.min() >= -1.0
assert components.max() <= 1.0
def test_random_comp_generate_mean():
c = pt.initializers.RandomNormalCompInitializer(2, -1.0)
components = c.generate(num_components=1024)
assert torch.allclose(components.mean(),
torch.tensor(-1.0),
rtol=1e-05,
atol=1e-01)
def test_comp_generate_0_components():
c = pt.initializers.ZerosCompInitializer(2)
_ = c.generate(num_components=0)
def test_stratified_mean_comp_generate():
# yapf: disable
x = torch.Tensor(
[[0, -1, -2],
[10, 11, 12],
[0, 0, 0],
[2, 2, 2]])
y = torch.LongTensor([0, 0, 1, 1])
desired = torch.Tensor(
[[5.0, 5.0, 5.0],
[1.0, 1.0, 1.0]])
# yapf: enable
c = pt.initializers.StratifiedMeanCompInitializer(data=[x, y])
actual = c.generate([1, 1])
assert torch.allclose(actual, desired)
def test_stratified_selection_comp_generate():
# yapf: disable
x = torch.Tensor(
[[0, 0, 0],
[1, 1, 1],
[0, 0, 0],
[1, 1, 1]])
y = torch.LongTensor([0, 1, 0, 1])
desired = torch.Tensor(
[[0, 0, 0],
[1, 1, 1]])
# yapf: enable
c = pt.initializers.StratifiedSelectionCompInitializer(data=[x, y])
actual = c.generate([1, 1])
assert torch.allclose(actual, desired)
# Labels initializers
def test_literal_labels_init():
l = pt.initializers.LiteralLabelsInitializer([0, 0, 1, 2])
with pytest.warns(UserWarning):
labels = l.generate([])
assert torch.allclose(labels, torch.LongTensor([0, 0, 1, 2]))
def test_labels_init_from_list():
l = pt.initializers.LabelsInitializer()
components = l.generate(distribution=[1, 1, 1])
assert torch.allclose(components, torch.LongTensor([0, 1, 2]))
def test_labels_init_from_tuple_legal():
l = pt.initializers.LabelsInitializer()
components = l.generate(distribution=(3, 1))
assert torch.allclose(components, torch.LongTensor([0, 1, 2]))
def test_labels_init_from_tuple_illegal():
l = pt.initializers.LabelsInitializer()
with pytest.raises(AssertionError):
_ = l.generate(distribution=(1, 1, 1))
def test_data_aware_labels_init():
data, targets = [0, 1, 2, 3], [0, 0, 1, 1]
ds = pt.datasets.NumpyDataset(data, targets)
l = pt.initializers.DataAwareLabelsInitializer(ds)
labels = l.generate([])
assert torch.allclose(labels, torch.LongTensor(targets))
# Reasonings initializers
def test_literal_reasonings_init():
r = pt.initializers.LiteralReasoningsInitializer([0, 0, 1, 2])
with pytest.warns(UserWarning):
reasonings = r.generate([])
assert torch.allclose(reasonings, torch.Tensor([0, 0, 1, 2]))
def test_random_reasonings_init():
r = pt.initializers.RandomReasoningsInitializer(0.2, 0.8)
reasonings = r.generate(distribution=[0, 1])
assert torch.numel(reasonings) == 1 * 2 * 2
assert reasonings.min() >= 0.2
assert reasonings.max() <= 0.8
def test_zeros_reasonings_init():
r = pt.initializers.ZerosReasoningsInitializer()
reasonings = r.generate(distribution=[0, 1])
assert torch.allclose(reasonings, torch.zeros(1, 2, 2))
def test_ones_reasonings_init():
r = pt.initializers.ZerosReasoningsInitializer()
reasonings = r.generate(distribution=[1, 2, 3])
assert torch.allclose(reasonings, torch.zeros(6, 3, 2))
def test_pure_positive_reasonings_init_one_per_class():
r = pt.initializers.PurePositiveReasoningsInitializer(
components_first=False)
reasonings = r.generate(distribution=(4, 1))
assert torch.allclose(reasonings[0], torch.eye(4))
def test_pure_positive_reasonings_init_unrepresented_classes():
r = pt.initializers.PurePositiveReasoningsInitializer()
reasonings = r.generate(distribution=[9, 0, 0, 0])
assert reasonings.shape[0] == 9
assert reasonings.shape[1] == 4
assert reasonings.shape[2] == 2
def test_random_reasonings_init_channels_not_first():
r = pt.initializers.RandomReasoningsInitializer(components_first=False)
reasonings = r.generate(distribution=[0, 0, 0, 1])
assert reasonings.shape[0] == 2
assert reasonings.shape[1] == 4
assert reasonings.shape[2] == 1
# Transform initializers
def test_eye_transform_init_square():
t = pt.initializers.EyeTransformInitializer()
I = t.generate(3, 3)
assert torch.allclose(I, torch.eye(3))
def test_eye_transform_init_narrow():
t = pt.initializers.EyeTransformInitializer()
actual = t.generate(3, 2)
desired = torch.Tensor([[1, 0], [0, 1], [0, 0]])
assert torch.allclose(actual, desired)
def test_eye_transform_init_wide():
t = pt.initializers.EyeTransformInitializer()
actual = t.generate(2, 3)
desired = torch.Tensor([[1, 0, 0], [0, 1, 0]])
assert torch.allclose(actual, desired)
# Transforms
def test_linear_transform():
l = pt.transforms.LinearTransform(2, 4)
actual = l.weights
desired = torch.Tensor([[1, 0, 0, 0], [0, 1, 0, 0]])
assert torch.allclose(actual, desired)
def test_linear_transform_zeros_init():
l = pt.transforms.LinearTransform(
in_dim=2,
out_dim=4,
initializer=pt.initializers.ZerosLinearTransformInitializer(),
)
actual = l.weights
desired = torch.zeros(2, 4)
assert torch.allclose(actual, desired)
def test_linear_transform_out_dim_first():
l = pt.transforms.LinearTransform(
in_dim=2,
out_dim=4,
initializer=pt.initializers.OLTI(out_dim_first=True),
)
assert l.weights.shape[0] == 4
assert l.weights.shape[1] == 2
# Components
def test_components_no_initializer():
with pytest.raises(TypeError):
_ = pt.components.Components(3, None)
def test_components_no_num_components():
with pytest.raises(TypeError):
_ = pt.components.Components(initializer=pt.initializers.OCI(2))
def test_components_none_num_components():
with pytest.raises(TypeError):
_ = pt.components.Components(None, initializer=pt.initializers.OCI(2))
def test_components_no_args():
with pytest.raises(TypeError):
_ = pt.components.Components()
def test_components_zeros_init():
c = pt.components.Components(3, pt.initializers.ZCI(2))
assert torch.allclose(c.components, torch.zeros(3, 2))
def test_labeled_components_dict_init():
c = pt.components.LabeledComponents({0: 3}, pt.initializers.OCI(2))
assert torch.allclose(c.components, torch.ones(3, 2))
assert torch.allclose(c.labels, torch.zeros(3, dtype=torch.long))
def test_labeled_components_list_init():
c = pt.components.LabeledComponents([3], pt.initializers.OCI(2))
assert torch.allclose(c.components, torch.ones(3, 2))
assert torch.allclose(c.labels, torch.zeros(3, dtype=torch.long))
def test_labeled_components_tuple_init():
c = pt.components.LabeledComponents({0: 1, 1: 2}, pt.initializers.OCI(2))
assert torch.allclose(c.components, torch.ones(3, 2))
assert torch.allclose(c.labels, torch.LongTensor([0, 1, 1]))
# Labels
def test_standalone_labels_dict_init():
l = pt.components.Labels({0: 3})
assert torch.allclose(l.labels, torch.zeros(3, dtype=torch.long))
def test_standalone_labels_list_init():
l = pt.components.Labels([3])
assert torch.allclose(l.labels, torch.zeros(3, dtype=torch.long))
def test_standalone_labels_tuple_init():
l = pt.components.Labels({0: 1, 1: 2})
assert torch.allclose(l.labels, torch.LongTensor([0, 1, 1]))
# Losses
def test_glvq_loss_int_labels():
d = torch.stack([torch.ones(100), torch.zeros(100)], dim=1)
labels = torch.tensor([0, 1])
targets = torch.ones(100)
batch_loss = pt.losses.glvq_loss(distances=d,
target_labels=targets,
prototype_labels=labels)
loss_value = torch.sum(batch_loss, dim=0)
assert loss_value == -100
def test_glvq_loss_one_hot_labels():
d = torch.stack([torch.ones(100), torch.zeros(100)], dim=1)
labels = torch.tensor([[0, 1], [1, 0]])
wl = torch.tensor([1, 0])
targets = torch.stack([wl for _ in range(100)], dim=0)
batch_loss = pt.losses.glvq_loss(distances=d,
target_labels=targets,
prototype_labels=labels)
loss_value = torch.sum(batch_loss, dim=0)
assert loss_value == -100
def test_glvq_loss_one_hot_unequal():
dlist = [torch.ones(100), torch.zeros(100), torch.zeros(100)]
d = torch.stack(dlist, dim=1)
labels = torch.tensor([[0, 1], [1, 0], [1, 0]])
wl = torch.tensor([1, 0])
targets = torch.stack([wl for _ in range(100)], dim=0)
batch_loss = pt.losses.glvq_loss(distances=d,
target_labels=targets,
prototype_labels=labels)
loss_value = torch.sum(batch_loss, dim=0)
assert loss_value == -100
# Activations
class TestActivations(unittest.TestCase):
def setUp(self):
self.flist = ["identity", "sigmoid_beta", "swish_beta"]
self.x = torch.randn(1024, 1)
def test_registry(self):
self.assertIsNotNone(pt.nn.ACTIVATIONS)
def test_funcname_deserialization(self):
for funcname in self.flist:
f = pt.nn.get_activation(funcname)
iscallable = callable(f)
self.assertTrue(iscallable)
def test_callable_deserialization(self):
def dummy(x, **kwargs):
return x
for f in [dummy, lambda x: x]:
f = pt.nn.get_activation(f)
iscallable = callable(f)
self.assertTrue(iscallable)
self.assertEqual(1, f(1))
def test_unknown_deserialization(self):
for funcname in ["blubb", "foobar"]:
with self.assertRaises(NameError):
_ = pt.nn.get_activation(funcname)
def test_identity(self):
actual = pt.nn.identity(self.x)
desired = self.x
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_sigmoid_beta1(self):
actual = pt.nn.sigmoid_beta(self.x, beta=1.0)
desired = torch.sigmoid(self.x)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_swish_beta1(self):
actual = pt.nn.swish_beta(self.x, beta=1.0)
desired = self.x * torch.sigmoid(self.x)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def tearDown(self):
del self.x
# Competitions
class TestCompetitions(unittest.TestCase):
def setUp(self):
pass
def test_wtac(self):
d = torch.tensor([[2.0, 3.0, 1.99, 3.01], [2.0, 3.0, 2.01, 3.0]])
labels = torch.tensor([0, 1, 2, 3])
competition_layer = pt.competitions.WTAC()
actual = competition_layer(d, labels)
desired = torch.tensor([2, 0])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_wtac_unequal_dist(self):
d = torch.tensor([[2.0, 3.0, 4.0], [2.0, 3.0, 1.0]])
labels = torch.tensor([0, 1, 1])
competition_layer = pt.competitions.WTAC()
actual = competition_layer(d, labels)
desired = torch.tensor([0, 1])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_wtac_one_hot(self):
d = torch.tensor([[1.99, 3.01], [3.0, 2.01]])
labels = torch.tensor([[0, 1], [1, 0]])
competition_layer = pt.competitions.WTAC()
actual = competition_layer(d, labels)
desired = torch.tensor([[0, 1], [1, 0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_knnc_k1(self):
d = torch.tensor([[2.0, 3.0, 1.99, 3.01], [2.0, 3.0, 2.01, 3.0]])
labels = torch.tensor([0, 1, 2, 3])
competition_layer = pt.competitions.KNNC(k=1)
actual = competition_layer(d, labels)
desired = torch.tensor([2, 0])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def tearDown(self):
pass
# Pooling
class TestPooling(unittest.TestCase):
def setUp(self):
pass
def test_stratified_min(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0], [9.0, 8.0, 0, 1]])
labels = torch.tensor([0, 0, 1, 2])
pooling_layer = pt.pooling.StratifiedMinPooling()
actual = pooling_layer(d, labels)
desired = torch.tensor([[0.0, 2.0, 3.0], [8.0, 0.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_min_one_hot(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0], [9.0, 8.0, 0, 1]])
labels = torch.tensor([0, 0, 1, 2])
labels = torch.eye(3)[labels]
pooling_layer = pt.pooling.StratifiedMinPooling()
actual = pooling_layer(d, labels)
desired = torch.tensor([[0.0, 2.0, 3.0], [8.0, 0.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_min_trivial(self):
d = torch.tensor([[0.0, 2.0, 3.0], [8.0, 0, 1]])
labels = torch.tensor([0, 1, 2])
pooling_layer = pt.pooling.StratifiedMinPooling()
actual = pooling_layer(d, labels)
desired = torch.tensor([[0.0, 2.0, 3.0], [8.0, 0.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_max(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0, 9.0], [9.0, 8.0, 0, 1, 7.0]])
labels = torch.tensor([0, 0, 3, 2, 0])
pooling_layer = pt.pooling.StratifiedMaxPooling()
actual = pooling_layer(d, labels)
desired = torch.tensor([[9.0, 3.0, 2.0], [9.0, 1.0, 0.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_max_one_hot(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0, 9.0], [9.0, 8.0, 0, 1, 7.0]])
labels = torch.tensor([0, 0, 2, 1, 0])
labels = torch.nn.functional.one_hot(labels, num_classes=3)
pooling_layer = pt.pooling.StratifiedMaxPooling()
actual = pooling_layer(d, labels)
desired = torch.tensor([[9.0, 3.0, 2.0], [9.0, 1.0, 0.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_sum(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0], [9.0, 8.0, 0, 1]])
labels = torch.LongTensor([0, 0, 1, 2])
pooling_layer = pt.pooling.StratifiedSumPooling()
actual = pooling_layer(d, labels)
desired = torch.tensor([[1.0, 2.0, 3.0], [17.0, 0.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_sum_one_hot(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0], [9.0, 8.0, 0, 1]])
labels = torch.tensor([0, 0, 1, 2])
labels = torch.eye(3)[labels]
pooling_layer = pt.pooling.StratifiedSumPooling()
actual = pooling_layer(d, labels)
desired = torch.tensor([[1.0, 2.0, 3.0], [17.0, 0.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_prod(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0, 9.0], [9.0, 8.0, 0, 1, 7.0]])
labels = torch.tensor([0, 0, 3, 2, 0])
pooling_layer = pt.pooling.StratifiedProdPooling()
actual = pooling_layer(d, labels)
desired = torch.tensor([[0.0, 3.0, 2.0], [504.0, 1.0, 0.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def tearDown(self):
pass
# Distances
class TestDistances(unittest.TestCase):
def setUp(self):
self.nx, self.mx = 32, 2048
self.ny, self.my = 8, 2048
self.x = torch.randn(self.nx, self.mx)
self.y = torch.randn(self.ny, self.my)
def test_manhattan(self):
actual = pt.distances.lpnorm_distance(self.x, self.y, p=1)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=1,
keepdim=False,
)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=2)
self.assertIsNone(mismatch)
def test_euclidean(self):
actual = pt.distances.euclidean_distance(self.x, self.y)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=2,
keepdim=False,
)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=3)
self.assertIsNone(mismatch)
def test_squared_euclidean(self):
actual = pt.distances.squared_euclidean_distance(self.x, self.y)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = (torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=2,
keepdim=False,
)**2)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=2)
self.assertIsNone(mismatch)
def test_lpnorm_p0(self):
actual = pt.distances.lpnorm_distance(self.x, self.y, p=0)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=0,
keepdim=False,
)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=4)
self.assertIsNone(mismatch)
def test_lpnorm_p2(self):
actual = pt.distances.lpnorm_distance(self.x, self.y, p=2)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=2,
keepdim=False,
)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=4)
self.assertIsNone(mismatch)
def test_lpnorm_p3(self):
actual = pt.distances.lpnorm_distance(self.x, self.y, p=3)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=3,
keepdim=False,
)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=4)
self.assertIsNone(mismatch)
def test_lpnorm_pinf(self):
actual = pt.distances.lpnorm_distance(self.x, self.y, p=float("inf"))
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=float("inf"),
keepdim=False,
)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=4)
self.assertIsNone(mismatch)
def test_omega_identity(self):
omega = torch.eye(self.mx, self.my)
actual = pt.distances.omega_distance(self.x, self.y, omega=omega)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = (torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=2,
keepdim=False,
)**2)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=2)
self.assertIsNone(mismatch)
def test_lomega_identity(self):
omega = torch.eye(self.mx, self.my)
omegas = torch.stack([omega for _ in range(self.ny)], dim=0)
actual = pt.distances.lomega_distance(self.x, self.y, omegas=omegas)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = (torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=2,
keepdim=False,
)**2)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=2)
self.assertIsNone(mismatch)
def tearDown(self):
del self.x, self.y

111
tests/test_datasets.py
View File

@ -1,32 +1,97 @@
"""ProtoTorch datasets test suite."""
"""ProtoTorch datasets test suite"""
import os
import shutil
import unittest
import numpy as np
import torch
from prototorch.datasets import abstract, tecator
import prototorch as pt
from prototorch.datasets.abstract import Dataset, ProtoDataset
class TestAbstract(unittest.TestCase):
def setUp(self):
self.ds = Dataset("./artifacts")
def test_getitem(self):
with self.assertRaises(NotImplementedError):
abstract.Dataset("./artifacts")[0]
_ = self.ds[0]
def test_len(self):
with self.assertRaises(NotImplementedError):
len(abstract.Dataset("./artifacts"))
_ = len(self.ds)
def tearDown(self):
del self.ds
class TestProtoDataset(unittest.TestCase):
def test_getitem(self):
with self.assertRaises(NotImplementedError):
abstract.ProtoDataset("./artifacts")[0]
def test_download(self):
with self.assertRaises(NotImplementedError):
abstract.ProtoDataset("./artifacts").download()
_ = ProtoDataset("./artifacts", download=True)
def test_exists(self):
with self.assertRaises(RuntimeError):
_ = ProtoDataset("./artifacts", download=False)
class TestNumpyDataset(unittest.TestCase):
def test_list_init(self):
ds = pt.datasets.NumpyDataset([1], [1])
self.assertEqual(len(ds), 1)
def test_numpy_init(self):
data = np.random.randn(3, 2)
targets = np.array([0, 1, 2])
ds = pt.datasets.NumpyDataset(data, targets)
self.assertEqual(len(ds), 3)
class TestSpiral(unittest.TestCase):
def test_init(self):
ds = pt.datasets.Spiral(num_samples=10)
self.assertEqual(len(ds), 10)
class TestIris(unittest.TestCase):
def setUp(self):
self.ds = pt.datasets.Iris()
def test_size(self):
self.assertEqual(len(self.ds), 150)
def test_dims(self):
self.assertEqual(self.ds.data.shape[1], 4)
def test_dims_selection(self):
ds = pt.datasets.Iris(dims=[0, 1])
self.assertEqual(ds.data.shape[1], 2)
class TestBlobs(unittest.TestCase):
def test_size(self):
ds = pt.datasets.Blobs(num_samples=10)
self.assertEqual(len(ds), 10)
class TestRandom(unittest.TestCase):
def test_size(self):
ds = pt.datasets.Random(num_samples=10)
self.assertEqual(len(ds), 10)
class TestCircles(unittest.TestCase):
def test_size(self):
ds = pt.datasets.Circles(num_samples=10)
self.assertEqual(len(ds), 10)
class TestMoons(unittest.TestCase):
def test_size(self):
ds = pt.datasets.Moons(num_samples=10)
self.assertEqual(len(ds), 10)
class TestTecator(unittest.TestCase):
@ -42,25 +107,25 @@ class TestTecator(unittest.TestCase):
rootdir = self.artifacts_dir.rpartition("/")[0]
self._remove_artifacts()
with self.assertRaises(RuntimeError):
_ = tecator.Tecator(rootdir, download=False)
_ = pt.datasets.Tecator(rootdir, download=False)
def test_download_caching(self):
rootdir = self.artifacts_dir.rpartition("/")[0]
_ = tecator.Tecator(rootdir, download=True, verbose=False)
_ = tecator.Tecator(rootdir, download=False, verbose=False)
_ = pt.datasets.Tecator(rootdir, download=True, verbose=False)
_ = pt.datasets.Tecator(rootdir, download=False, verbose=False)
def test_repr(self):
rootdir = self.artifacts_dir.rpartition("/")[0]
train = tecator.Tecator(rootdir, download=True, verbose=True)
train = pt.datasets.Tecator(rootdir, download=True, verbose=True)
self.assertTrue("Split: Train" in train.__repr__())
def test_download_train(self):
rootdir = self.artifacts_dir.rpartition("/")[0]
train = tecator.Tecator(root=rootdir,
train=True,
download=True,
verbose=False)
train = tecator.Tecator(root=rootdir, download=True, verbose=False)
train = pt.datasets.Tecator(root=rootdir,
train=True,
download=True,
verbose=False)
train = pt.datasets.Tecator(root=rootdir, download=True, verbose=False)
x_train, y_train = train.data, train.targets
self.assertEqual(x_train.shape[0], 144)
self.assertEqual(y_train.shape[0], 144)
@ -68,7 +133,7 @@ class TestTecator(unittest.TestCase):
def test_download_test(self):
rootdir = self.artifacts_dir.rpartition("/")[0]
test = tecator.Tecator(root=rootdir, train=False, verbose=False)
test = pt.datasets.Tecator(root=rootdir, train=False, verbose=False)
x_test, y_test = test.data, test.targets
self.assertEqual(x_test.shape[0], 71)
self.assertEqual(y_test.shape[0], 71)
@ -76,20 +141,20 @@ class TestTecator(unittest.TestCase):
def test_class_to_idx(self):
rootdir = self.artifacts_dir.rpartition("/")[0]
test = tecator.Tecator(root=rootdir, train=False, verbose=False)
test = pt.datasets.Tecator(root=rootdir, train=False, verbose=False)
_ = test.class_to_idx
def test_getitem(self):
rootdir = self.artifacts_dir.rpartition("/")[0]
test = tecator.Tecator(root=rootdir, train=False, verbose=False)
test = pt.datasets.Tecator(root=rootdir, train=False, verbose=False)
x, y = test[0]
self.assertEqual(x.shape[0], 100)
self.assertIsInstance(y, int)
def test_loadable_with_dataloader(self):
rootdir = self.artifacts_dir.rpartition("/")[0]
test = tecator.Tecator(root=rootdir, train=False, verbose=False)
test = pt.datasets.Tecator(root=rootdir, train=False, verbose=False)
_ = torch.utils.data.DataLoader(test, batch_size=64, shuffle=True)
def tearDown(self):
pass
self._remove_artifacts()

581
tests/test_functions.py
View File

@ -1,581 +0,0 @@
"""ProtoTorch functions test suite."""
import unittest
import numpy as np
import torch
from prototorch.functions import (activations, competitions, distances,
initializers, losses, pooling)
class TestActivations(unittest.TestCase):
def setUp(self):
self.flist = ["identity", "sigmoid_beta", "swish_beta"]
self.x = torch.randn(1024, 1)
def test_registry(self):
self.assertIsNotNone(activations.ACTIVATIONS)
def test_funcname_deserialization(self):
for funcname in self.flist:
f = activations.get_activation(funcname)
iscallable = callable(f)
self.assertTrue(iscallable)
# def test_torch_script(self):
# for funcname in self.flist:
# f = activations.get_activation(funcname)
# self.assertIsInstance(f, torch.jit.ScriptFunction)
def test_callable_deserialization(self):
def dummy(x, **kwargs):
return x
for f in [dummy, lambda x: x]:
f = activations.get_activation(f)
iscallable = callable(f)
self.assertTrue(iscallable)
self.assertEqual(1, f(1))
def test_unknown_deserialization(self):
for funcname in ["blubb", "foobar"]:
with self.assertRaises(NameError):
_ = activations.get_activation(funcname)
def test_identity(self):
actual = activations.identity(self.x)
desired = self.x
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_sigmoid_beta1(self):
actual = activations.sigmoid_beta(self.x, beta=1.0)
desired = torch.sigmoid(self.x)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_swish_beta1(self):
actual = activations.swish_beta(self.x, beta=1.0)
desired = self.x * torch.sigmoid(self.x)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def tearDown(self):
del self.x
class TestCompetitions(unittest.TestCase):
def setUp(self):
pass
def test_wtac(self):
d = torch.tensor([[2.0, 3.0, 1.99, 3.01], [2.0, 3.0, 2.01, 3.0]])
labels = torch.tensor([0, 1, 2, 3])
actual = competitions.wtac(d, labels)
desired = torch.tensor([2, 0])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_wtac_unequal_dist(self):
d = torch.tensor([[2.0, 3.0, 4.0], [2.0, 3.0, 1.0]])
labels = torch.tensor([0, 1, 1])
actual = competitions.wtac(d, labels)
desired = torch.tensor([0, 1])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_wtac_one_hot(self):
d = torch.tensor([[1.99, 3.01], [3.0, 2.01]])
labels = torch.tensor([[0, 1], [1, 0]])
actual = competitions.wtac(d, labels)
desired = torch.tensor([[0, 1], [1, 0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_knnc_k1(self):
d = torch.tensor([[2.0, 3.0, 1.99, 3.01], [2.0, 3.0, 2.01, 3.0]])
labels = torch.tensor([0, 1, 2, 3])
actual = competitions.knnc(d, labels, k=1)
desired = torch.tensor([2, 0])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def tearDown(self):
pass
class TestPooling(unittest.TestCase):
def setUp(self):
pass
def test_stratified_min(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0], [9.0, 8.0, 0, 1]])
labels = torch.tensor([0, 0, 1, 2])
actual = pooling.stratified_min_pooling(d, labels)
desired = torch.tensor([[0.0, 2.0, 3.0], [8.0, 0.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_min_one_hot(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0], [9.0, 8.0, 0, 1]])
labels = torch.tensor([0, 0, 1, 2])
labels = torch.eye(3)[labels]
actual = pooling.stratified_min_pooling(d, labels)
desired = torch.tensor([[0.0, 2.0, 3.0], [8.0, 0.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_min_trivial(self):
d = torch.tensor([[0.0, 2.0, 3.0], [8.0, 0, 1]])
labels = torch.tensor([0, 1, 2])
actual = pooling.stratified_min_pooling(d, labels)
desired = torch.tensor([[0.0, 2.0, 3.0], [8.0, 0.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_max(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0, 9.0], [9.0, 8.0, 0, 1, 7.0]])
labels = torch.tensor([0, 0, 3, 2, 0])
actual = pooling.stratified_max_pooling(d, labels)
desired = torch.tensor([[9.0, 3.0, 2.0], [9.0, 1.0, 0.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_max_one_hot(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0, 9.0], [9.0, 8.0, 0, 1, 7.0]])
labels = torch.tensor([0, 0, 2, 1, 0])
labels = torch.nn.functional.one_hot(labels, num_classes=3)
actual = pooling.stratified_max_pooling(d, labels)
desired = torch.tensor([[9.0, 3.0, 2.0], [9.0, 1.0, 0.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_sum(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0], [9.0, 8.0, 0, 1]])
labels = torch.LongTensor([0, 0, 1, 2])
actual = pooling.stratified_sum_pooling(d, labels)
desired = torch.tensor([[1.0, 2.0, 3.0], [17.0, 0.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_sum_one_hot(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0], [9.0, 8.0, 0, 1]])
labels = torch.tensor([0, 0, 1, 2])
labels = torch.eye(3)[labels]
actual = pooling.stratified_sum_pooling(d, labels)
desired = torch.tensor([[1.0, 2.0, 3.0], [17.0, 0.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_prod(self):
d = torch.tensor([[1.0, 0.0, 2.0, 3.0, 9.0], [9.0, 8.0, 0, 1, 7.0]])
labels = torch.tensor([0, 0, 3, 2, 0])
actual = pooling.stratified_prod_pooling(d, labels)
desired = torch.tensor([[0.0, 3.0, 2.0], [504.0, 1.0, 0.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def tearDown(self):
pass
class TestDistances(unittest.TestCase):
def setUp(self):
self.nx, self.mx = 32, 2048
self.ny, self.my = 8, 2048
self.x = torch.randn(self.nx, self.mx)
self.y = torch.randn(self.ny, self.my)
def test_manhattan(self):
actual = distances.lpnorm_distance(self.x, self.y, p=1)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=1,
keepdim=False,
)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=2)
self.assertIsNone(mismatch)
def test_euclidean(self):
actual = distances.euclidean_distance(self.x, self.y)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=2,
keepdim=False,
)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=3)
self.assertIsNone(mismatch)
def test_squared_euclidean(self):
actual = distances.squared_euclidean_distance(self.x, self.y)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = (torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=2,
keepdim=False,
)**2)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=2)
self.assertIsNone(mismatch)
def test_lpnorm_p0(self):
actual = distances.lpnorm_distance(self.x, self.y, p=0)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=0,
keepdim=False,
)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=4)
self.assertIsNone(mismatch)
def test_lpnorm_p2(self):
actual = distances.lpnorm_distance(self.x, self.y, p=2)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=2,
keepdim=False,
)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=4)
self.assertIsNone(mismatch)
def test_lpnorm_p3(self):
actual = distances.lpnorm_distance(self.x, self.y, p=3)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=3,
keepdim=False,
)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=4)
self.assertIsNone(mismatch)
def test_lpnorm_pinf(self):
actual = distances.lpnorm_distance(self.x, self.y, p=float("inf"))
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=float("inf"),
keepdim=False,
)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=4)
self.assertIsNone(mismatch)
def test_omega_identity(self):
omega = torch.eye(self.mx, self.my)
actual = distances.omega_distance(self.x, self.y, omega=omega)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = (torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=2,
keepdim=False,
)**2)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=2)
self.assertIsNone(mismatch)
def test_lomega_identity(self):
omega = torch.eye(self.mx, self.my)
omegas = torch.stack([omega for _ in range(self.ny)], dim=0)
actual = distances.lomega_distance(self.x, self.y, omegas=omegas)
desired = torch.empty(self.nx, self.ny)
for i in range(self.nx):
for j in range(self.ny):
desired[i][j] = (torch.nn.functional.pairwise_distance(
self.x[i].reshape(1, -1),
self.y[j].reshape(1, -1),
p=2,
keepdim=False,
)**2)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=2)
self.assertIsNone(mismatch)
def tearDown(self):
del self.x, self.y
class TestInitializers(unittest.TestCase):
def setUp(self):
self.flist = [
"zeros",
"ones",
"rand",
"randn",
"stratified_mean",
"stratified_random",
]
self.x = torch.tensor(
[[0, -1, -2], [10, 11, 12], [0, 0, 0], [2, 2, 2]],
dtype=torch.float32)
self.y = torch.tensor([0, 0, 1, 1])
self.gen = torch.manual_seed(42)
def test_registry(self):
self.assertIsNotNone(initializers.INITIALIZERS)
def test_funcname_deserialization(self):
for funcname in self.flist:
f = initializers.get_initializer(funcname)
iscallable = callable(f)
self.assertTrue(iscallable)
def test_callable_deserialization(self):
def dummy(x):
return x
for f in [dummy, lambda x: x]:
f = initializers.get_initializer(f)
iscallable = callable(f)
self.assertTrue(iscallable)
self.assertEqual(1, f(1))
def test_unknown_deserialization(self):
for funcname in ["blubb", "foobar"]:
with self.assertRaises(NameError):
_ = initializers.get_initializer(funcname)
def test_zeros(self):
pdist = torch.tensor([1, 1])
actual, _ = initializers.zeros(self.x, self.y, pdist)
desired = torch.zeros(2, 3)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_ones(self):
pdist = torch.tensor([1, 1])
actual, _ = initializers.ones(self.x, self.y, pdist)
desired = torch.ones(2, 3)
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_rand(self):
pdist = torch.tensor([1, 1])
actual, _ = initializers.rand(self.x, self.y, pdist)
desired = torch.rand(2, 3, generator=torch.manual_seed(42))
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_randn(self):
pdist = torch.tensor([1, 1])
actual, _ = initializers.randn(self.x, self.y, pdist)
desired = torch.randn(2, 3, generator=torch.manual_seed(42))
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_mean_equal1(self):
pdist = torch.tensor([1, 1])
actual, _ = initializers.stratified_mean(self.x, self.y, pdist, False)
desired = torch.tensor([[5.0, 5.0, 5.0], [1.0, 1.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_random_equal1(self):
pdist = torch.tensor([1, 1])
actual, _ = initializers.stratified_random(self.x, self.y, pdist,
False)
desired = torch.tensor([[0.0, -1.0, -2.0], [0.0, 0.0, 0.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_mean_equal2(self):
pdist = torch.tensor([2, 2])
actual, _ = initializers.stratified_mean(self.x, self.y, pdist, False)
desired = torch.tensor([[5.0, 5.0, 5.0], [5.0, 5.0, 5.0],
[1.0, 1.0, 1.0], [1.0, 1.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_random_equal2(self):
pdist = torch.tensor([2, 2])
actual, _ = initializers.stratified_random(self.x, self.y, pdist,
False)
desired = torch.tensor([[0.0, -1.0, -2.0], [0.0, -1.0, -2.0],
[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_mean_unequal(self):
pdist = torch.tensor([1, 3])
actual, _ = initializers.stratified_mean(self.x, self.y, pdist, False)
desired = torch.tensor([[5.0, 5.0, 5.0], [1.0, 1.0, 1.0],
[1.0, 1.0, 1.0], [1.0, 1.0, 1.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_random_unequal(self):
pdist = torch.tensor([1, 3])
actual, _ = initializers.stratified_random(self.x, self.y, pdist,
False)
desired = torch.tensor([[0.0, -1.0, -2.0], [0.0, 0.0, 0.0],
[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]])
mismatch = np.testing.assert_array_almost_equal(actual,
desired,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_mean_unequal_one_hot(self):
pdist = torch.tensor([1, 3])
y = torch.eye(2)[self.y]
desired1 = torch.tensor([[5.0, 5.0, 5.0], [1.0, 1.0, 1.0],
[1.0, 1.0, 1.0], [1.0, 1.0, 1.0]])
actual1, actual2 = initializers.stratified_mean(self.x, y, pdist)
desired2 = torch.tensor([[1, 0], [0, 1], [0, 1], [0, 1]])
mismatch = np.testing.assert_array_almost_equal(actual1,
desired1,
decimal=5)
mismatch = np.testing.assert_array_almost_equal(actual2,
desired2,
decimal=5)
self.assertIsNone(mismatch)
def test_stratified_random_unequal_one_hot(self):
pdist = torch.tensor([1, 3])
y = torch.eye(2)[self.y]
actual1, actual2 = initializers.stratified_random(self.x, y, pdist)
desired1 = torch.tensor([[0.0, -1.0, -2.0], [0.0, 0.0, 0.0],
[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]])
desired2 = torch.tensor([[1, 0], [0, 1], [0, 1], [0, 1]])
mismatch = np.testing.assert_array_almost_equal(actual1,
desired1,
decimal=5)
mismatch = np.testing.assert_array_almost_equal(actual2,
desired2,
decimal=5)
self.assertIsNone(mismatch)
def tearDown(self):
del self.x, self.y, self.gen
_ = torch.seed()
class TestLosses(unittest.TestCase):
def setUp(self):
pass
def test_glvq_loss_int_labels(self):
d = torch.stack([torch.ones(100), torch.zeros(100)], dim=1)
labels = torch.tensor([0, 1])
targets = torch.ones(100)
batch_loss = losses.glvq_loss(distances=d,
target_labels=targets,
prototype_labels=labels)
loss_value = torch.sum(batch_loss, dim=0)
self.assertEqual(loss_value, -100)
def test_glvq_loss_one_hot_labels(self):
d = torch.stack([torch.ones(100), torch.zeros(100)], dim=1)
labels = torch.tensor([[0, 1], [1, 0]])
wl = torch.tensor([1, 0])
targets = torch.stack([wl for _ in range(100)], dim=0)
batch_loss = losses.glvq_loss(distances=d,
target_labels=targets,
prototype_labels=labels)
loss_value = torch.sum(batch_loss, dim=0)
self.assertEqual(loss_value, -100)
def test_glvq_loss_one_hot_unequal(self):
dlist = [torch.ones(100), torch.zeros(100), torch.zeros(100)]
d = torch.stack(dlist, dim=1)
labels = torch.tensor([[0, 1], [1, 0], [1, 0]])
wl = torch.tensor([1, 0])
targets = torch.stack([wl for _ in range(100)], dim=0)
batch_loss = losses.glvq_loss(distances=d,
target_labels=targets,
prototype_labels=labels)
loss_value = torch.sum(batch_loss, dim=0)
self.assertEqual(loss_value, -100)
def tearDown(self):
pass

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"""ProtoTorch utils test suite"""
import numpy as np
import torch
import prototorch as pt
def test_mesh2d_without_input():
mesh, xx, yy = pt.utils.mesh2d(border=2.0, resolution=10)
assert mesh.shape[0] == 100
assert mesh.shape[1] == 2
assert xx.shape[0] == 10
assert xx.shape[1] == 10
assert yy.shape[0] == 10
assert yy.shape[1] == 10
assert np.min(xx) == -2.0
assert np.max(xx) == 2.0
assert np.min(yy) == -2.0
assert np.max(yy) == 2.0
def test_mesh2d_with_torch_input():
x = 10 * torch.rand(5, 2)
mesh, xx, yy = pt.utils.mesh2d(x, border=0.0, resolution=100)
assert mesh.shape[0] == 100 * 100
assert mesh.shape[1] == 2
assert xx.shape[0] == 100
assert xx.shape[1] == 100
assert yy.shape[0] == 100
assert yy.shape[1] == 100
assert np.min(xx) == x[:, 0].min()
assert np.max(xx) == x[:, 0].max()
assert np.min(yy) == x[:, 1].min()
assert np.max(yy) == x[:, 1].max()
def test_hex_to_rgb():
red_rgb = list(pt.utils.hex_to_rgb(["#ff0000"]))[0]
assert red_rgb[0] == 255
assert red_rgb[1] == 0
assert red_rgb[2] == 0
def test_rgb_to_hex():
blue_hex = list(pt.utils.rgb_to_hex([(0, 0, 255)]))[0]
assert blue_hex.lower() == "0000ff"