Merge branch 'master' into kernel_distances

.bumpversion.cfg

@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.5.0
+current_version = 0.4.2
 commit = True
 tag = True
 parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -23,9 +23,9 @@ A clear and concise description of what you expected to happen.
 If applicable, add screenshots to help explain your problem.
 
 **Desktop (please complete the following information):**
-- OS: [e.g. Ubuntu 20.10]
+ - OS: [e.g. Ubuntu 20.10]
-- Prototorch Version: [e.g. v0.4.0]
+ - Prototorch Version: [e.g. v0.4.0]
-- Python Version: [e.g. 3.9.5]
+ - Python Version: [e.g. 3.9.5]
 
 **Additional context**
-Add any other context about the problem here.
+Add any other context about the problem here.

.gitignore

@@ -154,5 +154,4 @@ scratch*
 # End of https://www.gitignore.io/api/visualstudiocode
 .vscode/
 
-reports
+reports
-artifacts

.travis.yml

@@ -4,9 +4,7 @@ language: python
 python: 3.8
 cache:
   directories:
-  - "$HOME/.cache/pip"
   - "./tests/artifacts"
-  - "$HOME/datasets"
 install:
 - pip install .[all] --progress-bar off
 

RELEASE.md

@@ -1,16 +1,13 @@
 # ProtoTorch Releases
 
-## Release 0.5.0
-
-- Breaking: Removed deprecated `prototorch.modules.Prototypes1D`.
-  - Use `prototorch.components.LabeledComponents` instead.
-
 ## Release 0.2.0
 
+### Includes
 - Fixes in example scripts.
 
 ## Release 0.1.1-dev0
 
+### Includes
 - Minor bugfixes.
 - 100% line coverage.
 

docs/source/api.rst

@@ -1,24 +1,13 @@
-.. ProtoTorch API Reference
+.. ProtoFlow API Reference
 
-ProtoTorch API Reference
+ProtoFlow API Reference
 ======================================
 
 Datasets
 --------------------------------------
-
-Common Datasets
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 .. automodule:: prototorch.datasets
    :members:
-
+   :undoc-members:
-
-Abstract Datasets
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-Abstract Datasets are used to build your own datasets.
-
-.. autoclass:: prototorch.datasets.abstract.NumpyDataset
-   :members:
 
 Functions
 --------------------------------------

docs/source/conf.py

@@ -23,7 +23,7 @@ author = "Jensun Ravichandran"
 
 # The full version, including alpha/beta/rc tags
 #
-release = "0.5.0"
+release = "0.4.2"
 
 # -- General configuration ---------------------------------------------------
 
@@ -46,7 +46,6 @@ extensions = [
     "sphinx.ext.viewcode",
     "sphinx_rtd_theme",
     "sphinxcontrib.katex",
-    'sphinx_autodoc_typehints',
 ]
 
 # katex_prerender = True
@@ -180,9 +179,6 @@ texinfo_documents = [
 intersphinx_mapping = {
     "python": ("https://docs.python.org/", None),
     "numpy": ("https://docs.scipy.org/doc/numpy/", None),
-    "torch": ('https://pytorch.org/docs/stable/', None),
-    "pytorch_lightning":
-    ("https://pytorch-lightning.readthedocs.io/en/stable/", None),
 }
 
 # -- Options for Epub output ----------------------------------------------

examples/glvq_iris.py

@@ -3,14 +3,15 @@
 import numpy as np
 import torch
 from matplotlib import pyplot as plt
-from prototorch.components import LabeledComponents, StratifiedMeanInitializer
-from prototorch.functions.competitions import wtac
-from prototorch.functions.distances import euclidean_distance
-from prototorch.modules.losses import GLVQLoss
 from sklearn.datasets import load_iris
 from sklearn.preprocessing import StandardScaler
 from torchinfo import summary
 
+from prototorch.functions.competitions import wtac
+from prototorch.functions.distances import euclidean_distance
+from prototorch.modules.losses import GLVQLoss
+from prototorch.modules.prototypes import Prototypes1D
+
 # Prepare and preprocess the data
 scaler = StandardScaler()
 x_train, y_train = load_iris(return_X_y=True)
@@ -24,17 +25,19 @@ class Model(torch.nn.Module):
     def __init__(self):
         """GLVQ model for training on 2D Iris data."""
         super().__init__()
-        prototype_initializer = StratifiedMeanInitializer([x_train, y_train])
+        self.proto_layer = Prototypes1D(
-        prototype_distribution = {"num_classes": 3, "prototypes_per_class": 3}
+            input_dim=2,
-        self.proto_layer = LabeledComponents(
+            prototypes_per_class=3,
-            prototype_distribution,
+            nclasses=3,
-            prototype_initializer,
+            prototype_initializer="stratified_random",
+            data=[x_train, y_train],
         )
 
     def forward(self, x):
-        prototypes, prototype_labels = self.proto_layer()
+        protos = self.proto_layer.prototypes
-        distances = euclidean_distance(x, prototypes)
+        plabels = self.proto_layer.prototype_labels
-        return distances, prototype_labels
+        dis = euclidean_distance(x, protos)
+        return dis, plabels
 
 
 # Build the GLVQ model
@@ -51,46 +54,43 @@ x_in = torch.Tensor(x_train)
 y_in = torch.Tensor(y_train)
 
 # Training loop
-TITLE = "Prototype Visualization"
+title = "Prototype Visualization"
-fig = plt.figure(TITLE)
+fig = plt.figure(title)
 for epoch in range(70):
     # Compute loss
-    distances, prototype_labels = model(x_in)
+    dis, plabels = model(x_in)
-    loss = criterion([distances, prototype_labels], y_in)
+    loss = criterion([dis, plabels], y_in)
-
-    # Compute Accuracy
     with torch.no_grad():
-        predictions = wtac(distances, prototype_labels)
+        pred = wtac(dis, plabels)
-        correct = predictions.eq(y_in.view_as(predictions)).sum().item()
+        correct = pred.eq(y_in.view_as(pred)).sum().item()
     acc = 100.0 * correct / len(x_train)
-
     print(
         f"Epoch: {epoch + 1:03d} Loss: {loss.item():05.02f} Acc: {acc:05.02f}%"
     )
 
-    # Optimizer step
+    # Take a gradient descent step
     optimizer.zero_grad()
     loss.backward()
     optimizer.step()
 
     # Get the prototypes form the model
-    prototypes = model.proto_layer.components.numpy()
+    protos = model.proto_layer.prototypes.data.numpy()
-    if np.isnan(np.sum(prototypes)):
+    if np.isnan(np.sum(protos)):
         print("Stopping training because of `nan` in prototypes.")
         break
 
     # Visualize the data and the prototypes
     ax = fig.gca()
     ax.cla()
-    ax.set_title(TITLE)
+    ax.set_title(title)
     ax.set_xlabel("Data dimension 1")
     ax.set_ylabel("Data dimension 2")
     cmap = "viridis"
     ax.scatter(x_train[:, 0], x_train[:, 1], c=y_train, edgecolor="k")
     ax.scatter(
-        prototypes[:, 0],
+        protos[:, 0],
-        prototypes[:, 1],
+        protos[:, 1],
-        c=prototype_labels,
+        c=plabels,
         cmap=cmap,
         edgecolor="k",
         marker="D",
@@ -98,7 +98,7 @@ for epoch in range(70):
     )
 
     # Paint decision regions
-    x = np.vstack((x_train, prototypes))
+    x = np.vstack((x_train, protos))
     x_min, x_max = x[:, 0].min() - 1, x[:, 0].max() + 1
     y_min, y_max = x[:, 1].min() - 1, x[:, 1].max() + 1
     xx, yy = np.meshgrid(np.arange(x_min, x_max, 1 / 50),
@@ -108,7 +108,7 @@ for epoch in range(70):
     torch_input = torch.Tensor(mesh_input)
     d = model(torch_input)[0]
     w_indices = torch.argmin(d, dim=1)
-    y_pred = torch.index_select(prototype_labels, 0, w_indices)
+    y_pred = torch.index_select(plabels, 0, w_indices)
     y_pred = y_pred.reshape(xx.shape)
 
     # Plot voronoi regions

examples/gmlvq_tecator.py

@@ -2,12 +2,13 @@
 
 import matplotlib.pyplot as plt
 import torch
-from prototorch.components import LabeledComponents, StratifiedMeanInitializer
+from torch.utils.data import DataLoader
+
 from prototorch.datasets.tecator import Tecator
 from prototorch.functions.distances import sed
+from prototorch.modules import Prototypes1D
 from prototorch.modules.losses import GLVQLoss
 from prototorch.utils.colors import get_legend_handles
-from torch.utils.data import DataLoader
 
 # Prepare the dataset and dataloader
 train_data = Tecator(root="./artifacts", train=True)
@@ -18,22 +19,22 @@ class Model(torch.nn.Module):
     def __init__(self, **kwargs):
         """GMLVQ model as a siamese network."""
         super().__init__()
-        prototype_initializer = StratifiedMeanInitializer(train_loader)
+        x, y = train_data.data, train_data.targets
-        prototype_distribution = {"num_classes": 2, "prototypes_per_class": 2}
+        self.p1 = Prototypes1D(
-
+            input_dim=100,
-        self.proto_layer = LabeledComponents(
+            prototypes_per_class=2,
-            prototype_distribution,
+            nclasses=2,
-            prototype_initializer,
+            prototype_initializer="stratified_random",
+            data=[x, y],
         )
-
         self.omega = torch.nn.Linear(in_features=100,
                                      out_features=100,
                                      bias=False)
         torch.nn.init.eye_(self.omega.weight)
 
     def forward(self, x):
-        protos = self.proto_layer.components
+        protos = self.p1.prototypes
-        plabels = self.proto_layer.component_labels
+        plabels = self.p1.prototype_labels
 
         # Process `x` and `protos` through `omega`
         x_map = self.omega(x)
@@ -85,8 +86,8 @@ im = ax.imshow(omega.dot(omega.T), cmap="viridis")
 plt.show()
 
 # Get the prototypes form the model
-protos = model.proto_layer.components.numpy()
+protos = model.p1.prototypes.data.numpy()
-plabels = model.proto_layer.component_labels.numpy()
+plabels = model.p1.prototype_labels
 
 # Visualize the prototypes
 title = "Tecator Prototypes"

examples/gtlvq_mnist.py

@@ -12,19 +12,20 @@ import numpy as np
 import torch
 import torch.nn as nn
 import torchvision
+from torchvision import transforms
+
 from prototorch.functions.helper import calculate_prototype_accuracy
 from prototorch.modules.losses import GLVQLoss
 from prototorch.modules.models import GTLVQ
-from torchvision import transforms
 
 # Parameters and options
-num_epochs = 50
+n_epochs = 50
 batch_size_train = 64
 batch_size_test = 1000
 learning_rate = 0.1
 momentum = 0.5
 log_interval = 10
-cuda = "cuda:0"
+cuda = "cuda:1"
 random_seed = 1
 device = torch.device(cuda if torch.cuda.is_available() else "cpu")
 
@@ -140,14 +141,14 @@ optimizer = torch.optim.Adam(
 criterion = GLVQLoss(squashing="sigmoid_beta", beta=10)
 
 # Training loop
-for epoch in range(num_epochs):
+for epoch in range(n_epochs):
     for batch_idx, (x_train, y_train) in enumerate(train_loader):
         model.train()
         x_train, y_train = x_train.to(device), y_train.to(device)
         optimizer.zero_grad()
 
         distances = model(x_train)
-        plabels = model.gtlvq.cls.component_labels.to(device)
+        plabels = model.gtlvq.cls.prototype_labels.to(device)
 
         # Compute loss.
         loss = criterion([distances, plabels], y_train)
@@ -160,7 +161,7 @@ for epoch in range(num_epochs):
         if batch_idx % log_interval == 0:
             acc = calculate_prototype_accuracy(distances, y_train, plabels)
             print(
-                f"Epoch: {epoch + 1:02d}/{num_epochs:02d} Epoch Progress: {100. * batch_idx / len(train_loader):02.02f} % Loss: {loss.item():02.02f} \
+                f"Epoch: {epoch + 1:02d}/{n_epochs:02d} Epoch Progress: {100. * batch_idx / len(train_loader):02.02f} % Loss: {loss.item():02.02f} \
               Train Acc: {acc.item():02.02f}")
 
     # Test

examples/lgmlvq_iris.py

@@ -3,13 +3,15 @@
 import numpy as np
 import torch
 from matplotlib import pyplot as plt
-from prototorch.components import LabeledComponents, StratifiedMeanInitializer
-from prototorch.functions.competitions import stratified_min
-from prototorch.functions.distances import lomega_distance
-from prototorch.modules.losses import GLVQLoss
 from sklearn.datasets import load_iris
 from sklearn.metrics import accuracy_score
 
+from prototorch.functions.competitions import stratified_min
+from prototorch.functions.distances import lomega_distance
+from prototorch.functions.init import eye_
+from prototorch.modules.losses import GLVQLoss
+from prototorch.modules.prototypes import Prototypes1D
+
 # Prepare training data
 x_train, y_train = load_iris(True)
 x_train = x_train[:, [0, 2]]
@@ -20,19 +22,19 @@ class Model(torch.nn.Module):
     def __init__(self):
         """Local-GMLVQ model."""
         super().__init__()
-
+        self.p1 = Prototypes1D(
-        prototype_initializer = StratifiedMeanInitializer([x_train, y_train])
+            input_dim=2,
-        prototype_distribution = [1, 2, 2]
+            prototype_distribution=[1, 2, 2],
-        self.proto_layer = LabeledComponents(
+            prototype_initializer="stratified_random",
-            prototype_distribution,
+            data=[x_train, y_train],
-            prototype_initializer,
         )
-
+        omegas = torch.zeros(5, 2, 2)
-        omegas = torch.eye(2, 2).repeat(5, 1, 1)
         self.omegas = torch.nn.Parameter(omegas)
+        eye_(self.omegas)
 
     def forward(self, x):
-        protos, plabels = self.proto_layer()
+        protos = self.p1.prototypes
+        plabels = self.p1.prototype_labels
         omegas = self.omegas
         dis = lomega_distance(x, protos, omegas)
         return dis, plabels
@@ -67,7 +69,7 @@ for epoch in range(100):
     optimizer.step()
 
     # Get the prototypes form the model
-    protos = model.proto_layer.components.numpy()
+    protos = model.p1.prototypes.data.numpy()
 
     # Visualize the data and the prototypes
     ax = fig.gca()

prototorch/__init__.py

@@ -1,24 +1,21 @@
 """ProtoTorch package."""
 
-import pkgutil
-
-import pkg_resources
-
-from . import components, datasets, functions, modules, utils
-from .datasets import *
-
 # Core Setup
-__version__ = "0.5.0"
+__version__ = "0.4.2"
 
 __all_core__ = [
     "datasets",
     "functions",
     "modules",
-    "components",
-    "utils",
 ]
 
+from .datasets import *
+
 # Plugin Loader
+import pkgutil
+
+import pkg_resources
+
 __path__ = pkgutil.extend_path(__path__, __name__)
 
 

prototorch/components/components.py

@@ -1,107 +1,59 @@
 """ProtoTorch components modules."""
 
 import warnings
+from typing import Tuple
 
 import torch
 from prototorch.components.initializers import (ClassAwareInitializer,
                                                 ComponentsInitializer,
-                                                CustomLabelsInitializer,
                                                 EqualLabelsInitializer,
                                                 UnequalLabelsInitializer,
                                                 ZeroReasoningsInitializer)
+from prototorch.functions.initializers import get_initializer
 from torch.nn.parameter import Parameter
 
-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:
-            labels = CustomLabelsInitializer(distribution)
-    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 Components(torch.nn.Module):
     """Components is a set of learnable Tensors."""
     def __init__(self,
-                 num_components=None,
+                 number_of_components=None,
                  initializer=None,
                  *,
-                 initialized_components=None):
+                 initialized_components=None,
+                 dtype=torch.float32):
         super().__init__()
 
         # Ignore all initialization settings if initialized_components is given.
         if initialized_components is not None:
-            self._register_components(initialized_components)
+            self._components = Parameter(initialized_components)
-            if num_components is not None or initializer is not None:
+            if number_of_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)
+            self._initialize_components(number_of_components, initializer)
 
-    @property
+    def _precheck_initializer(self, initializer):
-    def num_components(self):
+        if not isinstance(initializer, ComponentsInitializer):
-        return len(self._components)
+            emsg = f"`initializer` has to be some subtype of " \
+                f"{ComponentsInitializer}. " \
+                f"You have provided: {initializer=} instead."
+            raise TypeError(emsg)
 
-    def _register_components(self, components):
+    def _initialize_components(self, number_of_components, initializer):
-        self.register_parameter("_components", Parameter(components))
+        self._precheck_initializer(initializer)
-
+        self._components = Parameter(
-    def _initialize_components(self, num_components, initializer):
+            initializer.generate(number_of_components))
-        _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()
+        return self._components.detach().cpu()
 
     def forward(self):
         return self._components
 
     def extra_repr(self):
-        return f"(components): (shape: {tuple(self._components.shape)})"
+        return f"components.shape: {tuple(self._components.shape)}"
 
 
 class LabeledComponents(Components):
@@ -115,65 +67,36 @@ class LabeledComponents(Components):
                  *,
                  initialized_components=None):
         if initialized_components is not None:
-            components, component_labels = parse_data_arg(
+            super().__init__(initialized_components=initialized_components[0])
-                initialized_components)
+            self._labels = initialized_components[1]
-            super().__init__(initialized_components=components)
-            self._labels = component_labels
         else:
-            labels = get_labels_object(distribution)
+            self._initialize_labels(distribution)
-            self.initial_distribution = labels.distribution
+            super().__init__(number_of_components=len(self._labels),
-            _labels = labels.generate()
+                             initializer=initializer)
-            super().__init__(len(_labels), initializer=initializer)
-            self._register_labels(_labels)
 
-    def _register_labels(self, labels):
+    def _initialize_components(self, number_of_components, initializer):
-        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)
+            self._precheck_initializer(initializer)
-            _components = initializer.generate(num_components,
+            self._components = Parameter(
-                                               self.initial_distribution)
+                initializer.generate(number_of_components, self.distribution))
-            self._register_components(_components)
         else:
-            super()._initialize_components(num_components, initializer)
+            super()._initialize_components(self, number_of_components,
+                                           initializer)
 
-    def add_components(self, distribution, initializer):
+    def _initialize_labels(self, distribution):
-        _precheck_initializer(initializer)
+        if type(distribution) == tuple:
+            num_classes, prototypes_per_class = distribution
+            labels = EqualLabelsInitializer(num_classes, prototypes_per_class)
+        elif type(distribution) == list:
+            labels = UnequalLabelsInitializer(distribution)
 
-        # Labels
+        self.distribution = labels.distribution
-        labels = get_labels_object(distribution)
+        self._labels = labels.generate()
-        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), 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()
+        return self._labels.detach().cpu()
 
     def forward(self):
         return super().forward(), self._labels
@@ -200,21 +123,20 @@ class ReasoningComponents(Components):
                  *,
                  initialized_components=None):
         if initialized_components is not None:
-            components, reasonings = initialized_components
+            super().__init__(initialized_components=initialized_components[0])
-
+            self._reasonings = initialized_components[1]
-            super().__init__(initialized_components=components)
-            self.register_parameter("_reasonings", reasonings)
         else:
             self._initialize_reasonings(reasonings)
-            super().__init__(len(self._reasonings), initializer=initializer)
+            super().__init__(number_of_components=len(self._reasonings),
+                             initializer=initializer)
 
     def _initialize_reasonings(self, reasonings):
-        if isinstance(reasonings, tuple):
+        if type(reasonings) == tuple:
-            num_classes, num_components = reasonings
+            num_classes, number_of_components = reasonings
-            reasonings = ZeroReasoningsInitializer(num_classes, num_components)
+            reasonings = ZeroReasoningsInitializer(num_classes,
+                                                   number_of_components)
 
-        _reasonings = reasonings.generate()
+        self._reasonings = reasonings.generate()
-        self.register_parameter("_reasonings", _reasonings)
 
     @property
     def reasonings(self):
@@ -223,7 +145,7 @@ class ReasoningComponents(Components):
         Dimension NxCx2
 
         """
-        return self._reasonings.detach()
+        return self._reasonings.detach().cpu()
 
     def forward(self):
         return super().forward(), self._reasonings

prototorch/components/initializers.py

@@ -1,5 +1,4 @@
-"""ProtoTroch Component and Label Initializers."""
+"""ProtoTroch Initializers."""
-
 import warnings
 from collections.abc import Iterable
 from itertools import chain
@@ -8,36 +7,21 @@ import torch
 from torch.utils.data import DataLoader, Dataset
 
 
-def parse_data_arg(data_arg):
+def parse_init_arg(arg):
-    if isinstance(data_arg, Dataset):
+    if isinstance(arg, Dataset):
-        data_arg = DataLoader(data_arg, batch_size=len(data_arg))
+        data, labels = next(iter(DataLoader(arg, batch_size=len(arg))))
-
+        # data = data.view(len(arg), -1)  # flatten
-    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
+        data, labels = 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):
+        if not isinstance(labels, torch.Tensor):
-            wmsg = f"Converting targets to {torch.Tensor}."
+            wmsg = f"Converting labels to {torch.Tensor}."
             warnings.warn(wmsg)
-            targets = torch.Tensor(targets)
+            labels = torch.Tensor(labels)
-    return data, targets
+    return data, labels
-
-
-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
@@ -47,22 +31,18 @@ class ComponentsInitializer(object):
 
 
 class DimensionAwareInitializer(ComponentsInitializer):
-    def __init__(self, dims):
+    def __init__(self, c_dims):
         super().__init__()
-        if isinstance(dims, Iterable):
+        if isinstance(c_dims, Iterable):
-            self.components_dims = tuple(dims)
+            self.components_dims = tuple(c_dims)
         else:
-            self.components_dims = (dims, )
+            self.components_dims = (c_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
+        return torch.ones(gen_dims)
 
 
 class ZerosInitializer(DimensionAwareInitializer):
@@ -72,99 +52,94 @@ class ZerosInitializer(DimensionAwareInitializer):
 
 
 class UniformInitializer(DimensionAwareInitializer):
-    def __init__(self, dims, minimum=0.0, maximum=1.0, scale=1.0):
+    def __init__(self, c_dims, min=0.0, max=1.0):
-        super().__init__(dims)
+        super().__init__(c_dims)
-        self.minimum = minimum
+
-        self.maximum = maximum
+        self.min = min
-        self.scale = scale
+        self.max = max
 
     def generate(self, length):
         gen_dims = (length, ) + self.components_dims
-        return torch.ones(gen_dims).uniform_(self.minimum,
+        return torch.ones(gen_dims).uniform_(self.min, self.max)
-                                             self.maximum) * self.scale
 
 
-class DataAwareInitializer(ComponentsInitializer):
+class PositionAwareInitializer(ComponentsInitializer):
-    def __init__(self, data, transform=torch.nn.Identity()):
+    def __init__(self, positions):
         super().__init__()
-        self.data = data
+        self.data = positions
-        self.transform = transform
-
-    def __del__(self):
-        del self.data
 
 
-class SelectionInitializer(DataAwareInitializer):
+class SelectionInitializer(PositionAwareInitializer):
     def generate(self, length):
         indices = torch.LongTensor(length).random_(0, len(self.data))
-        return self.transform(self.data[indices])
+        return self.data[indices]
 
 
-class MeanInitializer(DataAwareInitializer):
+class MeanInitializer(PositionAwareInitializer):
     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))
+        return mean.repeat(repeat_dim)
 
 
-class ClassAwareInitializer(DataAwareInitializer):
+class ClassAwareInitializer(ComponentsInitializer):
-    def __init__(self, data, transform=torch.nn.Identity()):
+    def __init__(self, arg):
-        data, targets = parse_data_arg(data)
+        super().__init__()
-        super().__init__(data, transform)
+        data, labels = parse_init_arg(arg)
-        self.targets = targets
+        self.data = data
-        self.clabels = torch.unique(self.targets).int().tolist()
+        self.labels = labels
+
+        self.clabels = torch.unique(self.labels)
         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]))
+            dist = self.num_classes * [per_class]
-        if isinstance(dist, list):
+        samples_list = [
-            dist = dict(zip(self.clabels, dist))
+            init.generate(n) for init, n in zip(self.initializers, dist)
-        samples = [self.initializers[k].generate(n) for k, n in dist.items()]
+        ]
-        out = torch.vstack(samples)
+        return torch.vstack(samples_list)
-        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):
+    def __init__(self, arg):
-        super().__init__(data, **kwargs)
+        super().__init__(arg)
-        self.initializers = get_subinitializers(self.data, self.targets,
-                                                self.clabels, MeanInitializer)
 
-    def generate(self, length, dist):
+        self.initializers = []
+        for clabel in self.clabels:
+            class_data = self.data[self.labels == clabel]
+            class_initializer = MeanInitializer(class_data)
+            self.initializers.append(class_initializer)
+
+    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):
+    def __init__(self, arg, *, noise=None):
-        super().__init__(data, **kwargs)
+        super().__init__(arg)
         self.noise = noise
-        self.initializers = get_subinitializers(self.data, self.targets,
-                                                self.clabels,
-                                                SelectionInitializer)
 
-    def add_noise_v1(self, x):
+        self.initializers = []
-        return x + self.noise
+        for clabel in self.clabels:
+            class_data = self.data[self.labels == clabel]
+            class_initializer = SelectionInitializer(class_data)
+            self.initializers.append(class_initializer)
 
-    def add_noise_v2(self, x):
+    def add_noise(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):
+    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)
+            # samples = self.add_noise(samples)
+            samples = samples + self.noise
         return samples
 
 
@@ -182,13 +157,10 @@ class UnequalLabelsInitializer(LabelsInitializer):
     def distribution(self):
         return self.dist
 
-    def generate(self, clabels=None, dist=None):
+    def generate(self):
-        if not clabels:
+        clabels = range(len(self.dist))
-            clabels = range(len(self.dist))
+        labels = list(chain(*[[i] * n for i, n in zip(clabels, self.dist)]))
-        if not dist:
+        return torch.tensor(labels)
-            dist = self.dist
-        targets = list(chain(*[[i] * n for i, n in zip(clabels, dist)]))
-        return torch.LongTensor(targets)
 
 
 class EqualLabelsInitializer(LabelsInitializer):
@@ -204,13 +176,6 @@ class EqualLabelsInitializer(LabelsInitializer):
         return torch.arange(self.classes).repeat(self.per_class, 1).T.flatten()
 
 
-class CustomLabelsInitializer(UnequalLabelsInitializer):
-    def generate(self):
-        clabels = list(self.dist.keys())
-        dist = list(self.dist.values())
-        return super().generate(clabels, dist)
-
-
 # Reasonings
 class ReasoningsInitializer:
     def generate(self, length):
@@ -230,5 +195,3 @@ class ZeroReasoningsInitializer(ReasoningsInitializer):
 SSI = StratifiedSampleInitializer = StratifiedSelectionInitializer
 SMI = StratifiedMeanInitializer
 Random = RandomInitializer = UniformInitializer
-Zeros = ZerosInitializer
-Ones = OnesInitializer

prototorch/datasets/__init__.py

@@ -1,6 +1,11 @@
 """ProtoTorch datasets."""
 
 from .abstract import NumpyDataset
-from .sklearn import Blobs, Circles, Iris, Moons, Random
 from .spiral import Spiral
 from .tecator import Tecator
+
+__all__ = [
+    "NumpyDataset",
+    "Spiral",
+    "Tecator",
+]

prototorch/datasets/abstract.py

@@ -14,10 +14,8 @@ import torch
 
 class NumpyDataset(torch.utils.data.TensorDataset):
     """Create a PyTorch TensorDataset from NumPy arrays."""
-    def __init__(self, data, targets):
+    def __init__(self, *arrays):
-        self.data = torch.Tensor(data)
+        tensors = [torch.Tensor(arr) for arr in arrays]
-        self.targets = torch.LongTensor(targets)
-        tensors = [self.data, self.targets]
         super().__init__(*tensors)
 
 

prototorch/datasets/sklearn.py

@@ -1,137 +0,0 @@
-"""Thin wrappers for a few scikit-learn datasets.
-
-URL:
-    https://scikit-learn.org/stable/modules/classes.html#module-sklearn.datasets
-
-"""
-
-import warnings
-from typing import Sequence, Union
-
-from prototorch.datasets.abstract import NumpyDataset
-
-from sklearn.datasets import (load_iris, make_blobs, make_circles,
-                              make_classification, make_moons)
-
-
-class Iris(NumpyDataset):
-    """Iris Dataset by Ronald Fisher introduced in 1936.
-
-    The dataset contains four measurements from flowers of three species of iris.
-
-    .. list-table:: Iris
-        :header-rows: 1
-
-        * - dimensions
-          - classes
-          - training size
-          - validation size
-          - test size
-        * - 4
-          - 3
-          - 150
-          - 0
-          - 0
-
-    :param dims: select a subset of dimensions
-    """
-    def __init__(self, dims: Sequence[int] = None):
-        x, y = load_iris(return_X_y=True)
-        if dims:
-            x = x[:, dims]
-        super().__init__(x, y)
-
-
-class Blobs(NumpyDataset):
-    """Generate isotropic Gaussian blobs for clustering.
-
-    Read more at
-    https://scikit-learn.org/stable/datasets/sample_generators.html#sample-generators.
-
-    """
-    def __init__(self,
-                 num_samples: int = 300,
-                 num_features: int = 2,
-                 seed: Union[None, int] = 0):
-        x, y = make_blobs(num_samples,
-                          num_features,
-                          centers=None,
-                          random_state=seed,
-                          shuffle=False)
-        super().__init__(x, y)
-
-
-class Random(NumpyDataset):
-    """Generate a random n-class classification problem.
-
-    Read more at
-    https://scikit-learn.org/stable/modules/generated/sklearn.datasets.make_classification.html.
-
-    Note: n_classes * n_clusters_per_class <= 2**n_informative must satisfy.
-    """
-    def __init__(self,
-                 num_samples: int = 300,
-                 num_features: int = 2,
-                 num_classes: int = 2,
-                 num_clusters: int = 2,
-                 num_informative: Union[None, int] = None,
-                 separation: float = 1.0,
-                 seed: Union[None, int] = 0):
-        if not num_informative:
-            import math
-            num_informative = math.ceil(math.log2(num_classes * num_clusters))
-            if num_features < num_informative:
-                warnings.warn("Generating more features than requested.")
-                num_features = num_informative
-        x, y = make_classification(num_samples,
-                                   num_features,
-                                   n_informative=num_informative,
-                                   n_redundant=0,
-                                   n_classes=num_classes,
-                                   n_clusters_per_class=num_clusters,
-                                   class_sep=separation,
-                                   random_state=seed,
-                                   shuffle=False)
-        super().__init__(x, y)
-
-
-class Circles(NumpyDataset):
-    """Make a large circle containing a smaller circle in 2D.
-
-    A simple toy dataset to visualize clustering and classification algorithms.
-
-    Read more at
-    https://scikit-learn.org/stable/modules/generated/sklearn.datasets.make_circles.html
-
-    """
-    def __init__(self,
-                 num_samples: int = 300,
-                 noise: float = 0.3,
-                 factor: float = 0.8,
-                 seed: Union[None, int] = 0):
-        x, y = make_circles(num_samples,
-                            noise=noise,
-                            factor=factor,
-                            random_state=seed,
-                            shuffle=False)
-        super().__init__(x, y)
-
-
-class Moons(NumpyDataset):
-    """Make two interleaving half circles.
-
-    A simple toy dataset to visualize clustering and classification algorithms.
-
-    Read more at
-    https://scikit-learn.org/stable/modules/generated/sklearn.datasets.make_moons.html
-
-    """
-    def __init__(self,
-                 num_samples: int = 300,
-                 noise: float = 0.3,
-                 seed: Union[None, int] = 0):
-        x, y = make_moons(num_samples,
-                          noise=noise,
-                          random_state=seed,
-                          shuffle=False)
-        super().__init__(x, y)

prototorch/datasets/spiral.py

@@ -4,22 +4,18 @@ import numpy as np
 import torch
 
 
-def make_spiral(num_samples=500, noise=0.3):
+def make_spiral(n_samples=500, noise=0.3):
-    """Generates the Spiral Dataset.
-
-    For use in Prototorch use `prototorch.datasets.Spiral` instead.
-    """
     def get_samples(n, delta_t):
         points = []
         for i in range(n):
-            r = i / num_samples * 5
+            r = i / n_samples * 5
             t = 1.75 * i / n * 2 * np.pi + delta_t
             x = r * np.sin(t) + np.random.rand(1) * noise
             y = r * np.cos(t) + np.random.rand(1) * noise
             points.append([x, y])
         return points
 
-    n = num_samples // 2
+    n = n_samples // 2
     positive = get_samples(n=n, delta_t=0)
     negative = get_samples(n=n, delta_t=np.pi)
     x = np.concatenate(
@@ -31,27 +27,7 @@ def make_spiral(num_samples=500, noise=0.3):
 
 
 class Spiral(torch.utils.data.TensorDataset):
-    """Spiral dataset for binary classification.
+    """Spiral dataset for binary classification."""
-
+    def __init__(self, n_samples=500, noise=0.3):
-    This datasets consists of two spirals of two different classes.
+        x, y = make_spiral(n_samples, noise)
-
-    .. list-table:: Spiral
-        :header-rows: 1
-
-        * - dimensions
-          - classes
-          - training size
-          - validation size
-          - test size
-        * - 2
-          - 2
-          - num_samples
-          - 0
-          - 0
-
-    :param num_samples: number of random samples
-    :param noise: noise added to the spirals
-    """
-    def __init__(self, num_samples: int = 500, noise: float = 0.3):
-        x, y = make_spiral(num_samples, noise)
         super().__init__(torch.Tensor(x), torch.LongTensor(y))

prototorch/datasets/tecator.py

@@ -40,29 +40,15 @@ import os
 
 import numpy as np
 import torch
-from prototorch.datasets.abstract import ProtoDataset
 from torchvision.datasets.utils import download_file_from_google_drive
 
+from prototorch.datasets.abstract import ProtoDataset
+
 
 class Tecator(ProtoDataset):
     """
-    `Tecator Dataset <http://lib.stat.cmu.edu/datasets/tecator>`__ for classification.
+    `Tecator Dataset <http://lib.stat.cmu.edu/datasets/tecator>`__
-
+    for classification.
-    The dataset contains wavelength measurements of meat.
-
-    .. list-table:: Tecator
-        :header-rows: 1
-
-        * - dimensions
-          - classes
-          - training size
-          - validation size
-          - test size
-        * - 100
-          - 2
-          - 129
-          - 43
-          - 43
     """
 
     _resources = [
@@ -101,12 +87,12 @@ class Tecator(ProtoDataset):
             x_train, y_train = f["x_train"], f["y_train"]
             x_test, y_test = f["x_test"], f["y_test"]
         training_set = [
-            torch.Tensor(x_train),
+            torch.tensor(x_train, dtype=torch.float32),
-            torch.LongTensor(y_train),
+            torch.tensor(y_train),
         ]
         test_set = [
-            torch.Tensor(x_test),
+            torch.tensor(x_test, dtype=torch.float32),
-            torch.LongTensor(y_test),
+            torch.tensor(y_test),
         ]
 
         with open(os.path.join(self.processed_folder, self.training_file),

prototorch/functions/__init__.py

@@ -2,4 +2,11 @@
 
 from .activations import identity, sigmoid_beta, swish_beta
 from .competitions import knnc, wtac
-from .pooling import *
+
+__all__ = [
+    "identity",
+    "sigmoid_beta",
+    "swish_beta",
+    "knnc",
+    "wtac",
+]

prototorch/functions/activations.py

@@ -5,14 +5,17 @@ import torch
 ACTIVATIONS = dict()
 
 
-def register_activation(fn):
+# def register_activation(scriptf):
+#     ACTIVATIONS[scriptf.name] = scriptf
+#     return scriptf
+def register_activation(function):
     """Add the activation function to the registry."""
-    name = fn.__name__
+    ACTIVATIONS[function.__name__] = function
-    ACTIVATIONS[name] = fn
+    return function
-    return fn
 
 
 @register_activation
+# @torch.jit.script
 def identity(x, beta=0.0):
     """Identity activation function.
 
@@ -26,6 +29,7 @@ def identity(x, beta=0.0):
 
 
 @register_activation
+# @torch.jit.script
 def sigmoid_beta(x, beta=10.0):
     r"""Sigmoid activation function with scaling.
 
@@ -40,6 +44,7 @@ def sigmoid_beta(x, beta=10.0):
 
 
 @register_activation
+# @torch.jit.script
 def swish_beta(x, beta=10.0):
     r"""Swish activation function with scaling.
 

prototorch/functions/competitions.py

@@ -3,26 +3,43 @@
 import torch
 
 
-def wtac(distances: torch.Tensor,
+# @torch.jit.script
-         labels: torch.LongTensor) -> (torch.LongTensor):
+def stratified_min(distances, labels):
-    """Winner-Takes-All-Competition.
+    clabels = torch.unique(labels, dim=0)
+    nclasses = clabels.size()[0]
+    if distances.size()[1] == nclasses:
+        # skip if only one prototype per class
+        return distances
+    batch_size = distances.size()[0]
+    winning_distances = torch.zeros(nclasses, batch_size)
+    inf = torch.full_like(distances.T, fill_value=float("inf"))
+    # distances_to_wpluses = torch.where(matcher, distances, inf)
+    for i, cl in enumerate(clabels):
+        # cdists = distances.T[labels == cl]
+        matcher = torch.eq(labels.unsqueeze(dim=1), cl)
+        if labels.ndim == 2:
+            # if the labels are one-hot vectors
+            matcher = torch.eq(torch.sum(matcher, dim=-1), nclasses)
+        cdists = torch.where(matcher, distances.T, inf).T
+        winning_distances[i] = torch.min(cdists, dim=1,
+                                         keepdim=True).values.squeeze()
+    if labels.ndim == 2:
+        # Transpose to return with `batch_size` first and
+        # reverse the columns to fix the ordering of the classes
+        return torch.flip(winning_distances.T, dims=(1, ))
 
-    Returns the labels corresponding to the winners.
+    return winning_distances.T  # return with `batch_size` first
 
-    """
+
+# @torch.jit.script
+def wtac(distances, labels):
     winning_indices = torch.min(distances, dim=1).indices
     winning_labels = labels[winning_indices].squeeze()
     return winning_labels
 
 
-def knnc(distances: torch.Tensor,
+# @torch.jit.script
-         labels: torch.LongTensor,
+def knnc(distances, labels, k):
-         k: int = 1) -> (torch.LongTensor):
+    winning_indices = torch.topk(-distances, k=k.item(), dim=1).indices
-    """K-Nearest-Neighbors-Competition.
+    winning_labels = labels[winning_indices].squeeze()
-
-    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

prototorch/functions/distances.py

@@ -2,8 +2,12 @@
 
 import numpy as np
 import torch
-from prototorch.functions.helper import (_check_shapes, _int_and_mixed_shape,
+
-                                         equal_int_shape, get_flat)
+from prototorch.functions.helper import (
+    _check_shapes,
+    _int_and_mixed_shape,
+    equal_int_shape,
+)
 
 
 def squared_euclidean_distance(x, y):
@@ -11,10 +15,12 @@ def squared_euclidean_distance(x, y):
 
     Compute :math:`{\langle \bm x - \bm y \rangle}_2`
 
+    :param `torch.tensor` x: Two dimensional vector
+    :param `torch.tensor` y: Two dimensional vector
+
     **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)
@@ -27,17 +33,18 @@ def euclidean_distance(x, y):
 
     Compute :math:`\sqrt{{\langle \bm x - \bm y \rangle}_2}`
 
+    :param `torch.tensor` x: Input Tensor of shape :math:`X \times N`
+    :param `torch.tensor` y: Input Tensor of shape :math:`Y \times N`
+
     :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
@@ -58,9 +65,10 @@ def lpnorm_distance(x, y, p):
 
     Calls ``torch.cdist``
 
+    :param `torch.tensor` x: Two dimensional vector
+    :param `torch.tensor` y: Two dimensional vector
     :param p: p parameter of the lp norm
     """
-    x, y = get_flat(x, y)
     distances = torch.cdist(x, y, p=p)
     return distances
 
@@ -70,9 +78,10 @@ def omega_distance(x, y, omega):
 
     Compute :math:`{\| \Omega \bm x - \Omega \bm y \|}_p`
 
+    :param `torch.tensor` x: Two dimensional vector
+    :param `torch.tensor` y: Two dimensional vector
     :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)
@@ -84,9 +93,10 @@ def lomega_distance(x, y, omegas):
 
     Compute :math:`{\| \Omega_k \bm x - \Omega_k \bm y_k \|}_p`
 
+    :param `torch.tensor` x: Two dimensional vector
+    :param `torch.tensor` y: Two dimensional vector
     :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)
@@ -254,5 +264,86 @@ def tangent_distance(signals, protos, subspaces, squared=False, epsilon=1e-10):
             return diss.permute([1, 0, 2]).squeeze(-1)
 
 
+class KernelDistance:
+    r"""Kernel Distance
+
+    Distance based on a kernel function.
+    """
+    def __init__(self, kernel_fn):
+        self.kernel_fn = kernel_fn
+
+    def __call__(self, x_batch: torch.Tensor, y_batch: torch.Tensor):
+        return self._single_call(x_batch, y_batch)
+
+    def _single_call(self, x, y):
+        remove_dims = []
+        if len(x.shape) == 1:
+            x = x.unsqueeze(0)
+            remove_dims.append(0)
+        if len(y.shape) == 1:
+            y = y.unsqueeze(0)
+            remove_dims.append(-1)
+
+        output = self.kernel_fn(x, x).diag().unsqueeze(1) - 2 * self.kernel_fn(
+            x, y) + self.kernel_fn(y, y).diag()
+
+        for dim in remove_dims:
+            output.squeeze_(dim)
+
+        return torch.sqrt(output)
+
+
+class BatchKernelDistance:
+    r"""Kernel Distance
+
+    Distance based on a kernel function.
+    """
+    def __init__(self, kernel_fn):
+        self.kernel_fn = kernel_fn
+
+    def __call__(self, x_batch: torch.Tensor, y_batch: torch.Tensor):
+        remove_dims = 0
+        # Extend Single inputs
+        if len(x_batch.shape) == 1:
+            x_batch = x_batch.unsqueeze(0)
+            remove_dims += 1
+        if len(y_batch.shape) == 1:
+            y_batch = y_batch.unsqueeze(0)
+            remove_dims += 1
+
+        # Loop over batches
+        output = torch.FloatTensor(len(x_batch), len(y_batch))
+        for i, x in enumerate(x_batch):
+            for j, y in enumerate(y_batch):
+                output[i][j] = self._single_call(x, y)
+
+        for _ in range(remove_dims):
+            output.squeeze_(0)
+
+        return output
+
+    def _single_call(self, x, y):
+        kappa_xx = self.kernel_fn(x, x)
+        kappa_xy = self.kernel_fn(x, y)
+        kappa_yy = self.kernel_fn(y, y)
+
+        squared_distance = kappa_xx - 2 * kappa_xy + kappa_yy
+
+        return torch.sqrt(squared_distance)
+
+
+class SquaredKernelDistance(KernelDistance):
+    r"""Squared Kernel Distance
+
+    Kernel distance without final squareroot.
+    """
+    def single_call(self, x, y):
+        kappa_xx = self.kernel_fn(x, x)
+        kappa_xy = self.kernel_fn(x, y)
+        kappa_yy = self.kernel_fn(y, y)
+
+        return kappa_xx - 2 * kappa_xy + kappa_yy
+
+
 # Aliases
-sed = squared_euclidean_distance
+sed = squared_euclidean_distance

prototorch/functions/helper.py

@@ -1,11 +1,6 @@
 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.

prototorch/functions/initializers.py

@@ -15,59 +15,59 @@ def register_initializer(function):
 
 def labels_from(distribution, one_hot=True):
     """Takes a distribution tensor and returns a labels tensor."""
-    num_classes = distribution.shape[0]
+    nclasses = distribution.shape[0]
-    llist = [[i] * n for i, n in zip(range(num_classes), distribution)]
+    llist = [[i] * n for i, n in zip(range(nclasses), 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 torch.eye(nclasses)[plabels]
     return plabels
 
 
 @register_initializer
 def ones(x_train, y_train, prototype_distribution, one_hot=True):
-    num_protos = torch.sum(prototype_distribution)
+    nprotos = torch.sum(prototype_distribution)
-    protos = torch.ones(num_protos, *x_train.shape[1:])
+    protos = torch.ones(nprotos, *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)
+    nprotos = torch.sum(prototype_distribution)
-    protos = torch.zeros(num_protos, *x_train.shape[1:])
+    protos = torch.zeros(nprotos, *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)
+    nprotos = torch.sum(prototype_distribution)
-    protos = torch.rand(num_protos, *x_train.shape[1:])
+    protos = torch.rand(nprotos, *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)
+    nprotos = torch.sum(prototype_distribution)
-    protos = torch.randn(num_protos, *x_train.shape[1:])
+    protos = torch.randn(nprotos, *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)
+    nprotos = torch.sum(prototype_distribution)
     pdim = x_train.shape[1]
-    protos = torch.empty(num_protos, pdim)
+    protos = torch.empty(nprotos, 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]
+            nclasses = y_train.size()[1]
-            matcher = torch.eq(torch.sum(matcher, dim=-1), num_classes)
+            matcher = torch.eq(torch.sum(matcher, dim=-1), nclasses)
         xl = x_train[matcher]
         mean_xl = torch.mean(xl, dim=0)
         protos[i] = mean_xl
@@ -81,15 +81,15 @@ def stratified_random(x_train,
                       prototype_distribution,
                       one_hot=True,
                       epsilon=1e-7):
-    num_protos = torch.sum(prototype_distribution)
+    nprotos = torch.sum(prototype_distribution)
     pdim = x_train.shape[1]
-    protos = torch.empty(num_protos, pdim)
+    protos = torch.empty(nprotos, 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]
+            nclasses = y_train.size()[1]
-            matcher = torch.eq(torch.sum(matcher, dim=-1), num_classes)
+            matcher = torch.eq(torch.sum(matcher, dim=-1), nclasses)
         xl = x_train[matcher]
         rand_index = torch.zeros(1).long().random_(0, xl.shape[0] - 1)
         random_xl = xl[rand_index]

prototorch/functions/kernels.py

@@ -0,0 +1,28 @@
+"""
+Experimental Kernels
+"""
+
+import torch
+
+
+class ExplicitKernel:
+    def __init__(self, projection=torch.nn.Identity()):
+        self.projection = projection
+
+    def __call__(self, x, y):
+        return self.projection(x) @ self.projection(y).T
+
+
+class RadialBasisFunctionKernel:
+    def __init__(self, sigma) -> None:
+        self.s2 = sigma * sigma
+
+    def __call__(self, x, y):
+        remove_dim = False
+        if len(x.shape) > 1:
+            x = x.unsqueeze(1)
+            remove_dim = True
+        output = torch.exp(-torch.sum((x - y)**2, dim=-1) / (2 * self.s2))
+        if remove_dim:
+            output = output.squeeze(1)
+        return output

prototorch/functions/losses.py

@@ -8,12 +8,12 @@ def _get_matcher(targets, labels):
     matcher = torch.eq(targets.unsqueeze(dim=1), labels)
     if labels.ndim == 2:
         # if the labels are one-hot vectors
-        num_classes = targets.size()[1]
+        nclasses = targets.size()[1]
-        matcher = torch.eq(torch.sum(matcher, dim=-1), num_classes)
+        matcher = torch.eq(torch.sum(matcher, dim=-1), nclasses)
     return matcher
 
 
-def _get_dp_dm(distances, targets, plabels, with_indices=False):
+def _get_dp_dm(distances, targets, plabels):
     """Returns the d+ and d- values for a batch of distances."""
     matcher = _get_matcher(targets, plabels)
     not_matcher = torch.bitwise_not(matcher)
@@ -21,11 +21,9 @@ def _get_dp_dm(distances, targets, plabels, with_indices=False):
     inf = torch.full_like(distances, fill_value=float("inf"))
     d_matching = torch.where(matcher, distances, inf)
     d_unmatching = torch.where(not_matcher, distances, inf)
-    dp = torch.min(d_matching, dim=-1, keepdim=True)
+    dp = torch.min(d_matching, dim=1, keepdim=True).values
-    dm = torch.min(d_unmatching, dim=-1, keepdim=True)
+    dm = torch.min(d_unmatching, dim=1, keepdim=True).values
-    if with_indices:
+    return dp, dm
-        return dp, dm
-    return dp.values, dm.values
 
 
 def glvq_loss(distances, target_labels, prototype_labels):
@@ -49,46 +47,10 @@ def lvq1_loss(distances, target_labels, prototype_labels):
 
 def lvq21_loss(distances, target_labels, prototype_labels):
     """LVQ2.1 loss function with support for one-hot labels.
-
+    
     See Section 4 [Sado&Yamada]
     https://papers.nips.cc/paper/1995/file/9c3b1830513cc3b8fc4b76635d32e692-Paper.pdf
     """
     dp, dm = _get_dp_dm(distances, target_labels, prototype_labels)
     mu = dp - dm
-
+    return mu
-    return mu
-
-
-# Probabilistic
-def _get_class_probabilities(probabilities, targets, prototype_labels):
-    # Create Label Mapping
-    uniques = prototype_labels.unique(sorted=True).tolist()
-    key_val = {key: val for key, val in zip(uniques, range(len(uniques)))}
-
-    target_indices = torch.LongTensor(list(map(key_val.get, targets.tolist())))
-
-    whole = probabilities.sum(dim=1)
-    correct = probabilities[torch.arange(len(probabilities)), target_indices]
-    wrong = whole - correct
-
-    return whole, correct, wrong
-
-
-def nllr_loss(probabilities, targets, prototype_labels):
-    """Compute the Negative Log-Likelihood Ratio loss."""
-    _, correct, wrong = _get_class_probabilities(probabilities, targets,
-                                                 prototype_labels)
-
-    likelihood = correct / wrong
-    log_likelihood = torch.log(likelihood)
-    return -1.0 * log_likelihood
-
-
-def rslvq_loss(probabilities, targets, prototype_labels):
-    """Compute the Robust Soft Learning Vector Quantization (RSLVQ) loss."""
-    whole, correct, _ = _get_class_probabilities(probabilities, targets,
-                                                 prototype_labels)
-
-    likelihood = correct / whole
-    log_likelihood = torch.log(likelihood)
-    return -1.0 * log_likelihood

prototorch/functions/pooling.py

@@ -1,80 +0,0 @@
-"""ProtoTorch pooling functions."""
-
-from typing import Callable
-
-import torch
-
-
-def stratify_with(values: torch.Tensor,
-                  labels: torch.LongTensor,
-                  fn: Callable,
-                  fill_value: float = 0.0) -> (torch.Tensor):
-    """Apply an arbitrary stratification strategy on the columns on `values`.
-
-    The outputs correspond to sorted labels.
-    """
-    clabels = torch.unique(labels, dim=0, sorted=True)
-    num_classes = clabels.size()[0]
-    if values.size()[1] == num_classes:
-        # skip if stratification is trivial
-        return values
-    batch_size = values.size()[0]
-    winning_values = torch.zeros(num_classes, batch_size, device=labels.device)
-    filler = torch.full_like(values.T, fill_value=fill_value)
-    for i, cl in enumerate(clabels):
-        matcher = torch.eq(labels.unsqueeze(dim=1), cl)
-        if labels.ndim == 2:
-            # if the labels are one-hot vectors
-            matcher = torch.eq(torch.sum(matcher, dim=-1), num_classes)
-        cdists = torch.where(matcher, values.T, filler).T
-        winning_values[i] = fn(cdists)
-    if labels.ndim == 2:
-        # Transpose to return with `batch_size` first and
-        # reverse the columns to fix the ordering of the classes
-        return torch.flip(winning_values.T, dims=(1, ))
-
-    return winning_values.T  # return with `batch_size` first
-
-
-def stratified_sum_pooling(values: torch.Tensor,
-                           labels: torch.LongTensor) -> (torch.Tensor):
-    """Group-wise sum."""
-    winning_values = stratify_with(
-        values,
-        labels,
-        fn=lambda x: torch.sum(x, dim=1, keepdim=True).squeeze(),
-        fill_value=0.0)
-    return winning_values
-
-
-def stratified_min_pooling(values: torch.Tensor,
-                           labels: torch.LongTensor) -> (torch.Tensor):
-    """Group-wise minimum."""
-    winning_values = stratify_with(
-        values,
-        labels,
-        fn=lambda x: torch.min(x, dim=1, keepdim=True).values.squeeze(),
-        fill_value=float("inf"))
-    return winning_values
-
-
-def stratified_max_pooling(values: torch.Tensor,
-                           labels: torch.LongTensor) -> (torch.Tensor):
-    """Group-wise maximum."""
-    winning_values = stratify_with(
-        values,
-        labels,
-        fn=lambda x: torch.max(x, dim=1, keepdim=True).values.squeeze(),
-        fill_value=-1.0 * float("inf"))
-    return winning_values
-
-
-def stratified_prod_pooling(values: torch.Tensor,
-                            labels: torch.LongTensor) -> (torch.Tensor):
-    """Group-wise maximum."""
-    winning_values = stratify_with(
-        values,
-        labels,
-        fn=lambda x: torch.prod(x, dim=1, keepdim=True).squeeze(),
-        fill_value=1.0)
-    return winning_values

prototorch/functions/transforms.py

@@ -1,5 +0,0 @@
-import torch
-
-
-def gaussian(distance, variance):
-    return torch.exp(-(distance * distance) / (2 * variance))

prototorch/modules/__init__.py

@@ -1,7 +1,7 @@
 """ProtoTorch modules."""
 
-from .competitions import *
+from .prototypes import Prototypes1D
-from .initializers import *
+
-from .pooling import *
+__all__ = [
-from .transformations import *
+    "Prototypes1D",
-from .wrappers import LambdaLayer, LossLayer
+]

prototorch/modules/competitions.py

@@ -1,41 +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}"

prototorch/modules/initializers.py

@@ -1,61 +0,0 @@
-"""ProtoTroch Module Initializers."""
-
-import torch
-
-
-# Transformations
-class MatrixInitializer(object):
-    def __init__(self, *args, **kwargs):
-        ...
-
-    def generate(self, shape):
-        raise NotImplementedError("Subclasses should implement this!")
-
-
-class ZerosInitializer(MatrixInitializer):
-    def generate(self, shape):
-        return torch.zeros(shape)
-
-
-class OnesInitializer(MatrixInitializer):
-    def __init__(self, scale=1.0):
-        super().__init__()
-        self.scale = scale
-
-    def generate(self, shape):
-        return torch.ones(shape) * self.scale
-
-
-class UniformInitializer(MatrixInitializer):
-    def __init__(self, minimum=0.0, maximum=1.0, scale=1.0):
-        super().__init__()
-        self.minimum = minimum
-        self.maximum = maximum
-        self.scale = scale
-
-    def generate(self, shape):
-        return torch.ones(shape).uniform_(self.minimum,
-                                          self.maximum) * self.scale
-
-
-class DataAwareInitializer(MatrixInitializer):
-    def __init__(self, data, transform=torch.nn.Identity()):
-        super().__init__()
-        self.data = data
-        self.transform = transform
-
-    def __del__(self):
-        del self.data
-
-
-class EigenVectorInitializer(DataAwareInitializer):
-    def generate(self, shape):
-        # TODO
-        raise NotImplementedError()
-
-
-# Aliases
-EV = EigenVectorInitializer
-Random = RandomInitializer = UniformInitializer
-Zeros = ZerosInitializer
-Ones = OnesInitializer

prototorch/modules/losses.py

@@ -1,6 +1,7 @@
 """ProtoTorch losses."""
 
 import torch
+
 from prototorch.functions.activations import get_activation
 from prototorch.functions.losses import glvq_loss
 
@@ -20,8 +21,8 @@ class GLVQLoss(torch.nn.Module):
 
 
 class NeuralGasEnergy(torch.nn.Module):
-    def __init__(self, lm, **kwargs):
+    def __init__(self, lm):
-        super().__init__(**kwargs)
+        super().__init__()
         self.lm = lm
 
     def forward(self, d):
@@ -37,22 +38,3 @@ class NeuralGasEnergy(torch.nn.Module):
     @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

prototorch/modules/models.py

@@ -1,9 +1,11 @@
 import torch
-from prototorch.components import LabeledComponents, StratifiedMeanInitializer
-from prototorch.functions.distances import euclidean_distance_matrix
-from prototorch.functions.normalization import orthogonalization
 from torch import nn
 
+from prototorch.functions.distances import euclidean_distance_matrix, tangent_distance
+from prototorch.functions.helper import _check_shapes, _int_and_mixed_shape
+from prototorch.functions.normalization import orthogonalization
+from prototorch.modules.prototypes import Prototypes1D
+
 
 class GTLVQ(nn.Module):
     r""" Generalized Tangent Learning Vector Quantization
@@ -77,35 +79,45 @@ class GTLVQ(nn.Module):
         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":
+            if self.tpt == "local" or self.tpt == "local_proj":
-                self.init_local_subspace(subspace_data, subspace_size,
+                self.init_local_subspace(subspace_data)
-                                         self.num_protos)
             elif self.tpt == "global":
                 self.init_gobal_subspace(subspace_data, subspace_size)
             else:
                 self.subspaces = None
 
+        # Hypothesis-Margin-Classifier
+        self.cls = Prototypes1D(
+            input_dim=feature_dim,
+            prototypes_per_class=prototypes_per_class,
+            nclasses=num_classes,
+            prototype_initializer="stratified_mean",
+            data=prototype_data,
+        )
+
     def forward(self, x):
-        if self.tpt == "local":
+        # Tangent Projection
-            dis = self.local_tangent_distances(x)
+        if self.tpt == "local_proj":
+            x_conform = (x.unsqueeze(1).repeat_interleave(self.num_protos,
+                                                          1).unsqueeze(2))
+            dis, proj_x = self.local_tangent_projection(x_conform)
+
+            proj_x = proj_x.reshape(x.shape[0] * self.num_protos,
+                                    self.feature_dim)
+            return proj_x, dis
+        elif self.tpt == "local":
+            x_conform = (x.unsqueeze(1).repeat_interleave(self.num_protos,
+                                                          1).unsqueeze(2))
+            dis = tangent_distance(x_conform, self.cls.prototypes,
+                                   self.subspaces)
         elif self.tpt == "gloabl":
             dis = self.global_tangent_distances(x)
         else:
@@ -118,14 +130,16 @@ class GTLVQ(nn.Module):
         _, _, 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)
+        self.subspaces = (torch.nn.Parameter(
+            subspaces).clone().detach().requires_grad_(True))
 
-    def init_local_subspace(self, data, num_subspaces, num_protos):
+    def init_local_subspace(self, data):
-        data = data - torch.mean(data, dim=0)
+        _, _, v = torch.svd(data)
-        _, _, v = torch.svd(data, some=False)
+        inital_projector = (torch.eye(v.shape[0]) - (v @ v.T)).T
-        v = v[:, :num_subspaces]
+        subspaces = inital_projector.unsqueeze(0).repeat_interleave(
-        subspaces = v.unsqueeze(0).repeat_interleave(num_protos, 0)
+            self.num_protos, 0)
-        self.subspaces = nn.Parameter(subspaces, requires_grad=True)
+        self.subspaces = (torch.nn.Parameter(
+            subspaces).clone().detach().requires_grad_(True))
 
     def global_tangent_distances(self, x):
         # Tangent Projection
@@ -136,26 +150,37 @@ class GTLVQ(nn.Module):
         # Euclidean Distance
         return euclidean_distance_matrix(x, projected_prototypes)
 
-    def local_tangent_distances(self, x):
+    def local_tangent_projection(self, signals):
+        # Note: subspaces is always assumed as transposed and must be orthogonal!
+        # 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
+        # Origin Source Code
+        # Origin Author:
+        protos = self.cls.prototypes
+        subspaces = self.subspaces
+        signal_shape, signal_int_shape = _int_and_mixed_shape(signals)
+        _, proto_int_shape = _int_and_mixed_shape(protos)
 
-        # Tangent Distance
+        # check if the shapes are correct
-        x = x.unsqueeze(1).expand(x.size(0), self.cls.num_components,
+        _check_shapes(signal_int_shape, proto_int_shape)
-                                  x.size(-1))
+
-        protos = self.cls()[0].unsqueeze(0).expand(x.size(0),
+        # Tangent Data Projections
-                                                   self.cls.num_components,
+        projected_protos = torch.bmm(protos.unsqueeze(1), subspaces).squeeze(1)
-                                                   x.size(-1))
+        data = signals.squeeze(2).permute([1, 0, 2])
-        projectors = torch.eye(
+        projected_data = torch.bmm(data, subspaces)
-            self.subspaces.shape[-2], device=x.device) - torch.bmm(
+        projected_data = projected_data.permute([1, 0, 2]).unsqueeze(1)
-                self.subspaces, self.subspaces.permute([0, 2, 1]))
+        diff = projected_data - projected_protos
-        diff = (x - protos)
+        projected_diff = torch.reshape(
-        diff = diff.permute([1, 0, 2])
+            diff, (signal_shape[1], signal_shape[0], signal_shape[2]) +
-        diff = torch.bmm(diff, projectors)
+            signal_shape[3:])
-        diff = torch.norm(diff, 2, dim=-1).T
+        diss = torch.norm(projected_diff, 2, dim=-1)
-        return diff
+        return diss.permute([1, 0, 2]).squeeze(-1), projected_data.squeeze(1)
 
     def get_parameters(self):
         return {
-            "params": self.cls.components,
+            "params": self.cls.prototypes,
         }, {
             "params": self.subspaces
         }

prototorch/modules/pooling.py

@@ -1,31 +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)

prototorch/modules/prototypes.py

@@ -0,0 +1,137 @@
+"""ProtoTorch prototype modules."""
+
+import warnings
+
+import torch
+
+from prototorch.functions.initializers import get_initializer
+
+
+class _Prototypes(torch.nn.Module):
+    """Abstract prototypes class."""
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+    def _validate_prototype_distribution(self):
+        if 0 in self.prototype_distribution:
+            warnings.warn("Are you sure about the `0` in "
+                          "`prototype_distribution`?")
+
+    def extra_repr(self):
+        return f"prototypes.shape: {tuple(self.prototypes.shape)}"
+
+    def forward(self):
+        return self.prototypes, self.prototype_labels
+
+
+class Prototypes1D(_Prototypes):
+    """Create a learnable set of one-dimensional prototypes.
+
+    TODO Complete this doc-string.
+    """
+    def __init__(
+        self,
+        prototypes_per_class=1,
+        prototype_initializer="ones",
+        prototype_distribution=None,
+        data=None,
+        dtype=torch.float32,
+        one_hot_labels=False,
+        **kwargs,
+    ):
+        warnings.warn(
+            PendingDeprecationWarning(
+                "Prototypes1D will be replaced in future versions."))
+
+        # Convert tensors to python lists before processing
+        if prototype_distribution is not None:
+            if not isinstance(prototype_distribution, list):
+                prototype_distribution = prototype_distribution.tolist()
+
+        if data is None:
+            if "input_dim" not in kwargs:
+                raise NameError("`input_dim` required if "
+                                "no `data` is provided.")
+            if prototype_distribution:
+                kwargs_nclasses = sum(prototype_distribution)
+            else:
+                if "nclasses" not in kwargs:
+                    raise NameError("`prototype_distribution` required if "
+                                    "both `data` and `nclasses` are not "
+                                    "provided.")
+                kwargs_nclasses = kwargs.pop("nclasses")
+            input_dim = kwargs.pop("input_dim")
+            if prototype_initializer in [
+                    "stratified_mean", "stratified_random"
+            ]:
+                warnings.warn(
+                    f"`prototype_initializer`: `{prototype_initializer}` "
+                    "requires `data`, but `data` is not provided. "
+                    "Using randomly generated data instead.")
+            x_train = torch.rand(kwargs_nclasses, input_dim)
+            y_train = torch.arange(kwargs_nclasses)
+            if one_hot_labels:
+                y_train = torch.eye(kwargs_nclasses)[y_train]
+            data = [x_train, y_train]
+
+        x_train, y_train = data
+        x_train = torch.as_tensor(x_train).type(dtype)
+        y_train = torch.as_tensor(y_train).type(torch.int)
+        nclasses = torch.unique(y_train, dim=-1).shape[-1]
+
+        if nclasses == 1:
+            warnings.warn("Are you sure about having one class only?")
+
+        if x_train.ndim != 2:
+            raise ValueError("`data[0].ndim != 2`.")
+
+        if y_train.ndim == 2:
+            if y_train.shape[1] == 1 and one_hot_labels:
+                raise ValueError("`one_hot_labels` is set to `True` "
+                                 "but target labels are not one-hot-encoded.")
+            if y_train.shape[1] != 1 and not one_hot_labels:
+                raise ValueError("`one_hot_labels` is set to `False` "
+                                 "but target labels in `data` "
+                                 "are one-hot-encoded.")
+        if y_train.ndim == 1 and one_hot_labels:
+            raise ValueError("`one_hot_labels` is set to `True` "
+                             "but target labels are not one-hot-encoded.")
+
+        # Verify input dimension if `input_dim` is provided
+        if "input_dim" in kwargs:
+            input_dim = kwargs.pop("input_dim")
+            if input_dim != x_train.shape[1]:
+                raise ValueError(f"Provided `input_dim`={input_dim} does "
+                                 "not match data dimension "
+                                 f"`data[0].shape[1]`={x_train.shape[1]}")
+
+        # Verify the number of classes if `nclasses` is provided
+        if "nclasses" in kwargs:
+            kwargs_nclasses = kwargs.pop("nclasses")
+            if kwargs_nclasses != nclasses:
+                raise ValueError(f"Provided `nclasses={kwargs_nclasses}` does "
+                                 "not match data labels "
+                                 "`torch.unique(data[1]).shape[0]`"
+                                 f"={nclasses}")
+
+        super().__init__(**kwargs)
+
+        if not prototype_distribution:
+            prototype_distribution = [prototypes_per_class] * nclasses
+        with torch.no_grad():
+            self.prototype_distribution = torch.tensor(prototype_distribution)
+
+        self._validate_prototype_distribution()
+
+        self.prototype_initializer = get_initializer(prototype_initializer)
+        prototypes, prototype_labels = self.prototype_initializer(
+            x_train,
+            y_train,
+            prototype_distribution=self.prototype_distribution,
+            one_hot=one_hot_labels,
+        )
+
+        # Register module parameters
+        self.prototypes = torch.nn.Parameter(prototypes)
+        self.prototype_labels = torch.nn.Parameter(
+            prototype_labels.type(dtype)).requires_grad_(False)

prototorch/modules/transformations.py

@@ -1,49 +0,0 @@
-"""ProtoTorch Transformation Layers."""
-
-import torch
-from torch.nn.parameter import Parameter
-
-from .initializers import MatrixInitializer
-
-
-def _precheck_initializer(initializer):
-    if not isinstance(initializer, MatrixInitializer):
-        emsg = f"`initializer` has to be some subtype of " \
-            f"{MatrixInitializer}. " \
-            f"You have provided: {initializer=} instead."
-        raise TypeError(emsg)
-
-
-class Omega(torch.nn.Module):
-    """The Omega mapping used in GMLVQ."""
-    def __init__(self,
-                 num_replicas=1,
-                 input_dim=None,
-                 latent_dim=None,
-                 initializer=None,
-                 *,
-                 initialized_weights=None):
-        super().__init__()
-
-        if initialized_weights is not None:
-            self._register_weights(initialized_weights)
-        else:
-            if num_replicas == 1:
-                shape = (input_dim, latent_dim)
-            else:
-                shape = (num_replicas, input_dim, latent_dim)
-            self._initialize_weights(shape, initializer)
-
-    def _register_weights(self, weights):
-        self.register_parameter("_omega", Parameter(weights))
-
-    def _initialize_weights(self, shape, initializer):
-        _precheck_initializer(initializer)
-        _omega = initializer.generate(shape)
-        self._register_weights(_omega)
-
-    def forward(self):
-        return self._omega
-
-    def extra_repr(self):
-        return f"(omega): (shape: {tuple(self._omega.shape)})"

prototorch/modules/wrappers.py

@@ -1,36 +0,0 @@
-"""ProtoTorch Wrappers."""
-
-import torch
-
-
-class LambdaLayer(torch.nn.Module):
-    def __init__(self, fn, name=None):
-        super().__init__()
-        self.fn = fn
-        self.name = name or fn.__name__  # lambda fns get <lambda>
-
-    def forward(self, *args, **kwargs):
-        return self.fn(*args, **kwargs)
-
-    def extra_repr(self):
-        return self.name
-
-
-class LossLayer(torch.nn.modules.loss._Loss):
-    def __init__(self,
-                 fn,
-                 name=None,
-                 size_average=None,
-                 reduce=None,
-                 reduction: str = "mean") -> None:
-        super().__init__(size_average=size_average,
-                         reduce=reduce,
-                         reduction=reduction)
-        self.fn = fn
-        self.name = name or fn.__name__  # lambda fns get <lambda>
-
-    def forward(self, *args, **kwargs):
-        return self.fn(*args, **kwargs)
-
-    def extra_repr(self):
-        return self.name

prototorch/utils/utils.py

@@ -0,0 +1,243 @@
+"""Utilities that provide various small functionalities."""
+
+import os
+import pickle
+import sys
+from time import time
+
+import matplotlib.pyplot as plt
+import numpy as np
+
+
+def progressbar(title, value, end, bar_width=20):
+    percent = float(value) / end
+    arrow = "=" * int(round(percent * bar_width) - 1) + ">"
+    spaces = "." * (bar_width - len(arrow))
+    sys.stdout.write("\r{}: [{}] {}%".format(title, arrow + spaces,
+                                             int(round(percent * 100))))
+    sys.stdout.flush()
+    if percent == 1.0:
+        print()
+
+
+def prettify_string(inputs, start="", sep=" ", end="\n"):
+    outputs = start + " ".join(inputs.split()) + end
+    return outputs
+
+
+def pretty_print(inputs):
+    print(prettify_string(inputs))
+
+
+def writelog(self, *logs, logdir="./logs", logfile="run.txt"):
+    f = os.path.join(logdir, logfile)
+    with open(f, "a+") as fh:
+        for log in logs:
+            fh.write(log)
+            fh.write("\n")
+
+
+def start_tensorboard(self, logdir="./logs"):
+    cmd = f"tensorboard --logdir={logdir} --port=6006"
+    os.system(cmd)
+
+
+def make_directory(save_dir):
+    if not os.path.exists(save_dir):
+        print(f"Making directory {save_dir}.")
+        os.mkdir(save_dir)
+
+
+def make_gif(filenames, duration, output_file=None):
+    try:
+        import imageio
+    except ModuleNotFoundError as e:
+        print("Please install Protoflow with [other] extra requirements.")
+        raise (e)
+
+    images = list()
+    for filename in filenames:
+        images.append(imageio.imread(filename))
+    if not output_file:
+        output_file = f"makegif.gif"
+    if images:
+        imageio.mimwrite(output_file, images, duration=duration)
+
+
+def gif_from_dir(directory,
+                 duration,
+                 prefix="",
+                 output_file=None,
+                 verbose=True):
+    images = os.listdir(directory)
+    if verbose:
+        print(f"Making gif from {len(images)} images under {directory}.")
+    filenames = list()
+    # Sort images
+    images = sorted(
+        images,
+        key=lambda img: int(os.path.splitext(img)[0].replace(prefix, "")))
+    for image in images:
+        fname = os.path.join(directory, image)
+        filenames.append(fname)
+    if not output_file:
+        output_file = os.path.join(directory, "makegif.gif")
+    make_gif(filenames=filenames, duration=duration, output_file=output_file)
+
+
+def accuracy_score(y_true, y_pred):
+    accuracy = np.sum(y_true == y_pred)
+    normalized_acc = accuracy / float(len(y_true))
+    return normalized_acc
+
+
+def predict_and_score(clf,
+                      x_test,
+                      y_test,
+                      verbose=False,
+                      title="Test accuracy"):
+    y_pred = clf.predict(x_test)
+    accuracy = np.sum(y_test == y_pred)
+    normalized_acc = accuracy / float(len(y_test))
+    if verbose:
+        print(f"{title}: {normalized_acc * 100:06.04f}%")
+    return normalized_acc
+
+
+def remove_nan_rows(arr):
+    """Remove all rows with `nan` values in `arr`."""
+    mask = np.isnan(arr).any(axis=1)
+    return arr[~mask]
+
+
+def remove_nan_cols(arr):
+    """Remove all columns with `nan` values in `arr`."""
+    mask = np.isnan(arr).any(axis=0)
+    return arr[~mask]
+
+
+def replace_in(arr, replacement_dict, inplace=False):
+    """Replace the keys found in `arr` with the values from
+    the `replacement_dict`.
+    """
+    if inplace:
+        new_arr = arr
+    else:
+        import copy
+
+        new_arr = copy.deepcopy(arr)
+    for k, v in replacement_dict.items():
+        new_arr[arr == k] = v
+    return new_arr
+
+
+def train_test_split(data, train=0.7, val=0.15, shuffle=None, return_xy=False):
+    """Split a classification dataset in such a way so as to
+    preserve the class distribution in subsamples of the dataset.
+    """
+    if train + val > 1.0:
+        raise ValueError("Invalid split values for train and val.")
+    Y = data[:, -1]
+    labels = set(Y)
+    hist = dict()
+    for l in labels:
+        data_l = data[Y == l]
+        nl = len(data_l)
+        nl_train = int(nl * train)
+        nl_val = int(nl * val)
+        nl_test = nl - (nl_train + nl_val)
+        hist[l] = (nl_train, nl_val, nl_test)
+
+    train_data = list()
+    val_data = list()
+    test_data = list()
+    for l, (nl_train, nl_val, nl_test) in hist.items():
+        data_l = data[Y == l]
+        if shuffle:
+            np.random.shuffle(data_l)
+        train_l = data_l[:nl_train]
+        val_l = data_l[nl_train:nl_train + nl_val]
+        test_l = data_l[nl_train + nl_val:nl_train + nl_val + nl_test]
+        train_data.append(train_l)
+        val_data.append(val_l)
+        test_data.append(test_l)
+
+    def _squash(data_list):
+        data = np.array(data_list[0])
+        for item in data_list[1:]:
+            data = np.vstack((data, np.array(item)))
+        return data
+
+    train_data = _squash(train_data)
+    if val_data:
+        val_data = _squash(val_data)
+    if test_data:
+        test_data = _squash(test_data)
+    if return_xy:
+        x_train = train_data[:, :-1]
+        y_train = train_data[:, -1]
+        x_val = val_data[:, :-1]
+        y_val = val_data[:, -1]
+        x_test = test_data[:, :-1]
+        y_test = test_data[:, -1]
+        return (x_train, y_train), (x_val, y_val), (x_test, y_test)
+    return train_data, val_data, test_data
+
+
+def class_histogram(data, title="Untitled"):
+    plt.figure(title)
+    plt.clf()
+    plt.title(title)
+    dist, counts = np.unique(data[:, -1], return_counts=True)
+    plt.bar(dist, counts)
+    plt.xticks(dist)
+    print("Call matplotlib.pyplot.show() to see the plot.")
+
+
+def ntimer(n=10):
+    """Wraps a function which wraps another function to time it."""
+    if n < 1:
+        raise (Exception(f"Invalid n = {n} given."))
+
+    def timer(func):
+        """Wraps `func` with a timer and returns the wrapped `func`."""
+        def wrapper(*args, **kwargs):
+            rv = None
+            before = time()
+            for _ in range(n):
+                rv = func(*args, **kwargs)
+            after = time()
+            elapsed = after - before
+            print(f"Elapsed: {elapsed*1e3:02.02f} ms")
+            return rv
+
+        return wrapper
+
+    return timer
+
+
+def memoize(verbose=True):
+    """Wraps a function which wraps another function that memoizes."""
+    def memoizer(func):
+        """Memoize (cache) return values of `func`.
+        Wraps `func` and returns the wrapped `func` so that `func`
+        is executed when the results are not available in the cache.
+        """
+        cache = {}
+
+        def wrapper(*args, **kwargs):
+            t = (pickle.dumps(args), pickle.dumps(kwargs))
+            if t not in cache:
+                if verbose:
+                    print(f"Adding NEW rv {func.__name__}{args}{kwargs} "
+                          "to cache.")
+                cache[t] = func(*args, **kwargs)
+            else:
+                if verbose:
+                    print(f"Using OLD rv {func.__name__}{args}{kwargs} "
+                          "from cache.")
+            return cache[t]
+
+        return wrapper
+
+    return memoizer

setup.py

@@ -20,7 +20,6 @@ INSTALL_REQUIRES = [
     "torch>=1.3.1",
     "torchvision>=0.5.0",
     "numpy>=1.9.1",
-    "sklearn",
 ]
 DATASETS = [
     "requests",
@@ -32,9 +31,9 @@ DOCS = [
     "sphinx",
     "sphinx_rtd_theme",
     "sphinxcontrib-katex",
-    "sphinx-autodoc-typehints",
 ]
 EXAMPLES = [
+    "sklearn",
     "matplotlib",
     "torchinfo",
 ]
@@ -43,7 +42,7 @@ ALL = DATASETS + DEV + DOCS + EXAMPLES + TESTS
 
 setup(
     name="prototorch",
-    version="0.5.0",
+    version="0.4.2",
     description="Highly extensible, GPU-supported "
     "Learning Vector Quantization (LVQ) toolbox "
     "built using PyTorch and its nn API.",

tests/test_components.py

@@ -1,25 +0,0 @@
-"""ProtoTorch components test suite."""
-
-import prototorch as pt
-import torch
-
-
-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

tests/test_functions.py

@@ -4,8 +4,14 @@ import unittest
 
 import numpy as np
 import torch
-from prototorch.functions import (activations, competitions, distances,
+
-                                  initializers, losses, pooling)
+from prototorch.functions import (
+    activations,
+    competitions,
+    distances,
+    initializers,
+    losses,
+)
 
 
 class TestActivations(unittest.TestCase):
@@ -104,28 +110,10 @@ class TestCompetitions(unittest.TestCase):
                                                         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)
+        actual = competitions.stratified_min(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,
@@ -136,70 +124,28 @@ class TestPooling(unittest.TestCase):
         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)
+        actual = competitions.stratified_min(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):
+    def test_stratified_min_simple(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)
+        actual = competitions.stratified_min(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):
+    def test_knnc_k1(self):
-        d = torch.tensor([[1.0, 0.0, 2.0, 3.0, 9.0], [9.0, 8.0, 0, 1, 7.0]])
+        d = torch.tensor([[2.0, 3.0, 1.99, 3.01], [2.0, 3.0, 2.01, 3.0]])
-        labels = torch.tensor([0, 0, 3, 2, 0])
+        labels = torch.tensor([0, 1, 2, 3])
-        actual = pooling.stratified_max_pooling(d, labels)
+        actual = competitions.knnc(d, labels, k=torch.tensor([1]))
-        desired = torch.tensor([[9.0, 3.0, 2.0], [9.0, 1.0, 0.0]])
+        desired = torch.tensor([2, 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)

tests/test_kernels.py

@@ -0,0 +1,98 @@
+"""ProtoTorch kernels test suite."""
+
+import unittest
+
+import numpy as np
+import torch
+
+from prototorch.functions.distances import KernelDistance
+from prototorch.functions.kernels import ExplicitKernel, RadialBasisFunctionKernel
+
+
+class TestExplicitKernel(unittest.TestCase):
+    def setUp(self):
+        self.single_x = torch.randn(1024)
+        self.single_y = torch.randn(1024)
+
+        self.batch_x = torch.randn(32, 1024)
+        self.batch_y = torch.randn(32, 1024)
+
+    def test_single_values(self):
+        kernel = ExplicitKernel()
+        self.assertEqual(
+            kernel(self.single_x, self.single_y).shape, torch.Size([]))
+
+    def test_single_batch(self):
+        kernel = ExplicitKernel()
+        self.assertEqual(
+            kernel(self.single_x, self.batch_y).shape, torch.Size([32]))
+
+    def test_batch_single(self):
+        kernel = ExplicitKernel()
+        self.assertEqual(
+            kernel(self.batch_x, self.single_y).shape, torch.Size([32]))
+
+    def test_batch_values(self):
+        kernel = ExplicitKernel()
+        self.assertEqual(
+            kernel(self.batch_x, self.batch_y).shape, torch.Size([32, 32]))
+
+
+class TestRadialBasisFunctionKernel(unittest.TestCase):
+    def setUp(self):
+        self.single_x = torch.randn(1024)
+        self.single_y = torch.randn(1024)
+
+        self.batch_x = torch.randn(32, 1024)
+        self.batch_y = torch.randn(32, 1024)
+
+    def test_single_values(self):
+        kernel = RadialBasisFunctionKernel(1)
+        self.assertEqual(
+            kernel(self.single_x, self.single_y).shape, torch.Size([]))
+
+    def test_single_batch(self):
+        kernel = RadialBasisFunctionKernel(1)
+        self.assertEqual(
+            kernel(self.single_x, self.batch_y).shape, torch.Size([32]))
+
+    def test_batch_single(self):
+        kernel = RadialBasisFunctionKernel(1)
+        self.assertEqual(
+            kernel(self.batch_x, self.single_y).shape, torch.Size([32]))
+
+    def test_batch_values(self):
+        kernel = RadialBasisFunctionKernel(1)
+        self.assertEqual(
+            kernel(self.batch_x, self.batch_y).shape, torch.Size([32, 32]))
+
+
+class TestKernelDistance(unittest.TestCase):
+    def setUp(self):
+        self.single_x = torch.randn(1024)
+        self.single_y = torch.randn(1024)
+
+        self.batch_x = torch.randn(32, 1024)
+        self.batch_y = torch.randn(32, 1024)
+
+        self.kernel = ExplicitKernel()
+
+    def test_single_values(self):
+        distance = KernelDistance(self.kernel)
+        self.assertEqual(
+            distance(self.single_x, self.single_y).shape, torch.Size([]))
+
+    def test_single_batch(self):
+        distance = KernelDistance(self.kernel)
+        self.assertEqual(
+            distance(self.single_x, self.batch_y).shape, torch.Size([32]))
+
+    def test_batch_single(self):
+        distance = KernelDistance(self.kernel)
+        self.assertEqual(
+            distance(self.batch_x, self.single_y).shape, torch.Size([32]))
+
+    def test_batch_values(self):
+        distance = KernelDistance(self.kernel)
+        self.assertEqual(
+            distance(self.batch_x, self.batch_y).shape, torch.Size([32, 32]))

tests/test_modules.py

@@ -0,0 +1,298 @@
+"""ProtoTorch modules test suite."""
+
+import unittest
+
+import numpy as np
+import torch
+
+from prototorch.modules import losses, prototypes
+
+
+class TestPrototypes(unittest.TestCase):
+    def setUp(self):
+        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_prototypes1d_init_without_input_dim(self):
+        with self.assertRaises(NameError):
+            _ = prototypes.Prototypes1D(nclasses=2)
+
+    def test_prototypes1d_init_without_nclasses(self):
+        with self.assertRaises(NameError):
+            _ = prototypes.Prototypes1D(input_dim=1)
+
+    def test_prototypes1d_init_with_nclasses_1(self):
+        with self.assertWarns(UserWarning):
+            _ = prototypes.Prototypes1D(nclasses=1, input_dim=1)
+
+    def test_prototypes1d_init_without_pdist(self):
+        p1 = prototypes.Prototypes1D(
+            input_dim=6,
+            nclasses=2,
+            prototypes_per_class=4,
+            prototype_initializer="ones",
+        )
+        protos = p1.prototypes
+        actual = protos.detach().numpy()
+        desired = torch.ones(8, 6)
+        mismatch = np.testing.assert_array_almost_equal(actual,
+                                                        desired,
+                                                        decimal=5)
+        self.assertIsNone(mismatch)
+
+    def test_prototypes1d_init_without_data(self):
+        pdist = [2, 2]
+        p1 = prototypes.Prototypes1D(input_dim=3,
+                                     prototype_distribution=pdist,
+                                     prototype_initializer="zeros")
+        protos = p1.prototypes
+        actual = protos.detach().numpy()
+        desired = torch.zeros(4, 3)
+        mismatch = np.testing.assert_array_almost_equal(actual,
+                                                        desired,
+                                                        decimal=5)
+        self.assertIsNone(mismatch)
+
+    def test_prototypes1d_proto_init_without_data(self):
+        with self.assertWarns(UserWarning):
+            _ = prototypes.Prototypes1D(
+                input_dim=3,
+                nclasses=2,
+                prototypes_per_class=1,
+                prototype_initializer="stratified_mean",
+                data=None,
+            )
+
+    def test_prototypes1d_init_torch_pdist(self):
+        pdist = torch.tensor([2, 2])
+        p1 = prototypes.Prototypes1D(input_dim=3,
+                                     prototype_distribution=pdist,
+                                     prototype_initializer="zeros")
+        protos = p1.prototypes
+        actual = protos.detach().numpy()
+        desired = torch.zeros(4, 3)
+        mismatch = np.testing.assert_array_almost_equal(actual,
+                                                        desired,
+                                                        decimal=5)
+        self.assertIsNone(mismatch)
+
+    def test_prototypes1d_init_without_inputdim_with_data(self):
+        _ = prototypes.Prototypes1D(
+            nclasses=2,
+            prototypes_per_class=1,
+            prototype_initializer="stratified_mean",
+            data=[[[1.0], [0.0]], [1, 0]],
+        )
+
+    def test_prototypes1d_init_with_int_data(self):
+        _ = prototypes.Prototypes1D(
+            nclasses=2,
+            prototypes_per_class=1,
+            prototype_initializer="stratified_mean",
+            data=[[[1], [0]], [1, 0]],
+        )
+
+    def test_prototypes1d_init_one_hot_without_data(self):
+        _ = prototypes.Prototypes1D(
+            input_dim=1,
+            nclasses=2,
+            prototypes_per_class=1,
+            prototype_initializer="stratified_mean",
+            data=None,
+            one_hot_labels=True,
+        )
+
+    def test_prototypes1d_init_one_hot_labels_false(self):
+        """Test if ValueError is raised when `one_hot_labels` is set to `False`
+        but the provided `data` has one-hot encoded labels.
+        """
+        with self.assertRaises(ValueError):
+            _ = prototypes.Prototypes1D(
+                input_dim=1,
+                nclasses=2,
+                prototypes_per_class=1,
+                prototype_initializer="stratified_mean",
+                data=([[0.0], [1.0]], [[0, 1], [1, 0]]),
+                one_hot_labels=False,
+            )
+
+    def test_prototypes1d_init_1d_y_data_one_hot_labels_true(self):
+        """Test if ValueError is raised when `one_hot_labels` is set to `True`
+        but the provided `data` does not contain one-hot encoded labels.
+        """
+        with self.assertRaises(ValueError):
+            _ = prototypes.Prototypes1D(
+                input_dim=1,
+                nclasses=2,
+                prototypes_per_class=1,
+                prototype_initializer="stratified_mean",
+                data=([[0.0], [1.0]], [0, 1]),
+                one_hot_labels=True,
+            )
+
+    def test_prototypes1d_init_one_hot_labels_true(self):
+        """Test if ValueError is raised when `one_hot_labels` is set to `True`
+        but the provided `data` contains 2D targets but
+        does not contain one-hot encoded labels.
+        """
+        with self.assertRaises(ValueError):
+            _ = prototypes.Prototypes1D(
+                input_dim=1,
+                nclasses=2,
+                prototypes_per_class=1,
+                prototype_initializer="stratified_mean",
+                data=([[0.0], [1.0]], [[0], [1]]),
+                one_hot_labels=True,
+            )
+
+    def test_prototypes1d_init_with_int_dtype(self):
+        with self.assertRaises(RuntimeError):
+            _ = prototypes.Prototypes1D(
+                nclasses=2,
+                prototypes_per_class=1,
+                prototype_initializer="stratified_mean",
+                data=[[[1], [0]], [1, 0]],
+                dtype=torch.int32,
+            )
+
+    def test_prototypes1d_inputndim_with_data(self):
+        with self.assertRaises(ValueError):
+            _ = prototypes.Prototypes1D(input_dim=1,
+                                        nclasses=1,
+                                        prototypes_per_class=1,
+                                        data=[[1.0], [1]])
+
+    def test_prototypes1d_inputdim_with_data(self):
+        with self.assertRaises(ValueError):
+            _ = prototypes.Prototypes1D(
+                input_dim=2,
+                nclasses=2,
+                prototypes_per_class=1,
+                prototype_initializer="stratified_mean",
+                data=[[[1.0], [0.0]], [1, 0]],
+            )
+
+    def test_prototypes1d_nclasses_with_data(self):
+        """Test ValueError raise if provided `nclasses` is not the same
+        as the one computed from the provided `data`.
+        """
+        with self.assertRaises(ValueError):
+            _ = prototypes.Prototypes1D(
+                input_dim=1,
+                nclasses=1,
+                prototypes_per_class=1,
+                prototype_initializer="stratified_mean",
+                data=[[[1.0], [2.0]], [1, 2]],
+            )
+
+    def test_prototypes1d_init_with_ppc(self):
+        p1 = prototypes.Prototypes1D(data=[self.x, self.y],
+                                     prototypes_per_class=2,
+                                     prototype_initializer="zeros")
+        protos = p1.prototypes
+        actual = protos.detach().numpy()
+        desired = torch.zeros(4, 3)
+        mismatch = np.testing.assert_array_almost_equal(actual,
+                                                        desired,
+                                                        decimal=5)
+        self.assertIsNone(mismatch)
+
+    def test_prototypes1d_init_with_pdist(self):
+        p1 = prototypes.Prototypes1D(
+            data=[self.x, self.y],
+            prototype_distribution=[6, 9],
+            prototype_initializer="zeros",
+        )
+        protos = p1.prototypes
+        actual = protos.detach().numpy()
+        desired = torch.zeros(15, 3)
+        mismatch = np.testing.assert_array_almost_equal(actual,
+                                                        desired,
+                                                        decimal=5)
+        self.assertIsNone(mismatch)
+
+    def test_prototypes1d_func_initializer(self):
+        def my_initializer(*args, **kwargs):
+            return torch.full((2, 99), 99.0), torch.tensor([0, 1])
+
+        p1 = prototypes.Prototypes1D(
+            input_dim=99,
+            nclasses=2,
+            prototypes_per_class=1,
+            prototype_initializer=my_initializer,
+        )
+        protos = p1.prototypes
+        actual = protos.detach().numpy()
+        desired = 99 * torch.ones(2, 99)
+        mismatch = np.testing.assert_array_almost_equal(actual,
+                                                        desired,
+                                                        decimal=5)
+        self.assertIsNone(mismatch)
+
+    def test_prototypes1d_forward(self):
+        p1 = prototypes.Prototypes1D(data=[self.x, self.y])
+        protos, _ = p1()
+        actual = protos.detach().numpy()
+        desired = torch.ones(2, 3)
+        mismatch = np.testing.assert_array_almost_equal(actual,
+                                                        desired,
+                                                        decimal=5)
+        self.assertIsNone(mismatch)
+
+    def test_prototypes1d_dist_validate(self):
+        p1 = prototypes.Prototypes1D(input_dim=0, prototype_distribution=[0])
+        with self.assertWarns(UserWarning):
+            _ = p1._validate_prototype_distribution()
+
+    def test_prototypes1d_validate_extra_repr_not_empty(self):
+        p1 = prototypes.Prototypes1D(input_dim=0, prototype_distribution=[0])
+        rep = p1.extra_repr()
+        self.assertNotEqual(rep, "")
+
+    def tearDown(self):
+        del self.x, self.y, self.gen
+        _ = torch.seed()
+
+
+class TestLosses(unittest.TestCase):
+    def setUp(self):
+        pass
+
+    def test_glvqloss_init(self):
+        _ = losses.GLVQLoss(0, "swish_beta", beta=20)
+
+    def test_glvqloss_forward_1ppc(self):
+        criterion = losses.GLVQLoss(margin=0,
+                                    squashing="sigmoid_beta",
+                                    beta=100)
+        d = torch.stack([torch.ones(100), torch.zeros(100)], dim=1)
+        labels = torch.tensor([0, 1])
+        targets = torch.ones(100)
+        outputs = [d, labels]
+        loss = criterion(outputs, targets)
+        loss_value = loss.item()
+        self.assertAlmostEqual(loss_value, 0.0)
+
+    def test_glvqloss_forward_2ppc(self):
+        criterion = losses.GLVQLoss(margin=0,
+                                    squashing="sigmoid_beta",
+                                    beta=100)
+        d = torch.stack([
+            torch.ones(100),
+            torch.ones(100),
+            torch.zeros(100),
+            torch.ones(100)
+        ],
+                        dim=1)
+        labels = torch.tensor([0, 0, 1, 1])
+        targets = torch.ones(100)
+        outputs = [d, labels]
+        loss = criterion(outputs, targets)
+        loss_value = loss.item()
+        self.assertAlmostEqual(loss_value, 0.0)
+
+    def tearDown(self):
+        pass