262 lines
8.8 KiB
Python
262 lines
8.8 KiB
Python
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import os
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import numpy as np
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import torch
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from matplotlib import pyplot as plt
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from matplotlib.offsetbox import AnchoredText
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from prototorch.utils.celluloid import Camera
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from prototorch.utils.colors import color_scheme
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from prototorch.utils.utils import (gif_from_dir, make_directory,
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prettify_string)
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class VisWeights(Callback):
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"""Abstract weight visualization callback."""
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def __init__(
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self,
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data=None,
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ignore_last_output_row=False,
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label_map=None,
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project_mesh=False,
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project_protos=False,
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voronoi=False,
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axis_off=True,
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cmap="viridis",
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show=True,
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display_logs=True,
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display_logs_settings={},
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pause_time=0.5,
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border=1,
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resolution=10,
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interval=False,
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save=False,
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snap=True,
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save_dir="./img",
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make_gif=False,
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make_mp4=False,
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verbose=True,
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dpi=500,
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fps=5,
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figsize=(11, 8.5), # standard paper in inches
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prefix="",
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distance_layer_index=-1,
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**kwargs,
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):
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super().__init__(**kwargs)
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self.data = data
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self.ignore_last_output_row = ignore_last_output_row
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self.label_map = label_map
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self.voronoi = voronoi
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self.axis_off = True
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self.project_mesh = project_mesh
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self.project_protos = project_protos
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self.cmap = cmap
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self.show = show
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self.display_logs = display_logs
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self.display_logs_settings = display_logs_settings
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self.pause_time = pause_time
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self.border = border
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self.resolution = resolution
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self.interval = interval
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self.save = save
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self.snap = snap
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self.save_dir = save_dir
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self.make_gif = make_gif
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self.make_mp4 = make_mp4
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self.verbose = verbose
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self.dpi = dpi
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self.fps = fps
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self.figsize = figsize
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self.prefix = prefix
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self.distance_layer_index = distance_layer_index
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self.title = "Weights Visualization"
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make_directory(self.save_dir)
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def _skip_epoch(self, epoch):
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if self.interval:
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if epoch % self.interval != 0:
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return True
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return False
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def _clean_and_setup_ax(self):
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ax = self.ax
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if not self.snap:
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ax.cla()
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ax.set_title(self.title)
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if self.axis_off:
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ax.axis("off")
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def _savefig(self, fignum, orientation="horizontal"):
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figname = f"{self.save_dir}/{self.prefix}{fignum:05d}.png"
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figsize = self.figsize
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if orientation == "vertical":
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figsize = figsize[::-1]
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elif orientation == "horizontal":
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pass
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else:
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pass
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self.fig.set_size_inches(figsize, forward=False)
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self.fig.savefig(figname, dpi=self.dpi)
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def _show_and_save(self, epoch):
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if self.show:
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plt.pause(self.pause_time)
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if self.save:
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self._savefig(epoch)
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if self.snap:
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self.camera.snap()
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def _display_logs(self, ax, epoch, logs):
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if self.display_logs:
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settings = dict(
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loc="lower right",
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# padding between the text and bounding box
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pad=0.5,
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# padding between the bounding box and the axes
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borderpad=1.0,
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# https://matplotlib.org/api/text_api.html#matplotlib.text.Text
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prop=dict(
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fontfamily="monospace",
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fontweight="medium",
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fontsize=12,
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),
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)
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# Override settings with self.display_logs_settings.
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settings = {**settings, **self.display_logs_settings}
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log_string = f"""Epoch: {epoch:04d},
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val_loss: {logs.get('val_loss', np.nan):.03f},
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val_acc: {logs.get('val_acc', np.nan):.03f},
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loss: {logs.get('loss', np.nan):.03f},
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acc: {logs.get('acc', np.nan):.03f}
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"""
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log_string = prettify_string(log_string, end="")
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# https://matplotlib.org/api/offsetbox_api.html#matplotlib.offsetbox.AnchoredText
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anchored_text = AnchoredText(log_string, **settings)
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self.ax.add_artist(anchored_text)
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def on_train_start(self, trainer, pl_module, logs={}):
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self.fig = plt.figure(self.title)
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self.fig.set_size_inches(self.figsize, forward=False)
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self.ax = self.fig.add_subplot(111)
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self.camera = Camera(self.fig)
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def on_train_end(self, trainer, pl_module, logs={}):
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if self.make_gif:
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gif_from_dir(directory=self.save_dir,
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prefix=self.prefix,
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duration=1.0 / self.fps)
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if self.snap and self.make_mp4:
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animation = self.camera.animate()
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vid = os.path.join(self.save_dir, f"{self.prefix}animation.mp4")
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if self.verbose:
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print(f"Saving mp4 under {vid}.")
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animation.save(vid, fps=self.fps, dpi=self.dpi)
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class VisPointProtos(VisWeights):
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"""Visualization of prototypes.
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.. TODO::
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Still in Progress.
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"""
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def __init__(self, **kwargs):
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super().__init__(**kwargs)
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self.title = "Point Prototypes Visualization"
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self.data_scatter_settings = {
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"marker": "o",
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"s": 30,
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"edgecolor": "k",
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"cmap": self.cmap,
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}
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self.protos_scatter_settings = {
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"marker": "D",
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"s": 50,
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"edgecolor": "k",
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"cmap": self.cmap,
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}
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def on_epoch_start(self, trainer, pl_module, logs={}):
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epoch = trainer.current_epoch
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if self._skip_epoch(epoch):
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return True
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self._clean_and_setup_ax()
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protos = pl_module.prototypes
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labels = pl_module.proto_layer.prototype_labels.detach().cpu().numpy()
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if self.project_protos:
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protos = self.model.projection(protos).numpy()
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color_map = color_scheme(n=len(set(labels)),
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cmap=self.cmap,
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zero_indexed=True)
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# TODO Get rid of the assumption y values in [0, num_of_classes]
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label_colors = [color_map[l] for l in labels]
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if self.data is not None:
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x, y = self.data
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# TODO Get rid of the assumption y values in [0, num_of_classes]
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y_colors = [color_map[l] for l in y]
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# x = self.model.projection(x)
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if not isinstance(x, np.ndarray):
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x = x.numpy()
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# Plot data points.
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self.ax.scatter(x[:, 0],
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x[:, 1],
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c=y_colors,
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**self.data_scatter_settings)
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# Paint decision regions.
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if self.voronoi:
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border = self.border
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resolution = self.resolution
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x = np.vstack((x, protos))
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x_min, x_max = x[:, 0].min(), x[:, 0].max()
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y_min, y_max = x[:, 1].min(), x[:, 1].max()
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x_min, x_max = x_min - border, x_max + border
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y_min, y_max = y_min - border, y_max + border
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try:
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xx, yy = np.meshgrid(
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np.arange(x_min, x_max, (x_max - x_min) / resolution),
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np.arange(y_min, y_max, (x_max - x_min) / resolution),
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)
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except ValueError as ve:
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print(ve)
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raise ValueError(f"x_min: {x_min}, x_max: {x_max}. "
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f"x_min - x_max is {x_max - x_min}.")
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except MemoryError as me:
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print(me)
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raise ValueError("Too many points. "
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"Try reducing the resolution.")
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mesh_input = np.c_[xx.ravel(), yy.ravel()]
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# Predict mesh labels.
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if self.project_mesh:
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mesh_input = self.model.projection(mesh_input)
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y_pred = pl_module.predict(torch.Tensor(mesh_input))
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y_pred = y_pred.reshape(xx.shape)
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# Plot voronoi regions.
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self.ax.contourf(xx, yy, y_pred, cmap=self.cmap, alpha=0.35)
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self.ax.set_xlim(left=x_min + 0, right=x_max - 0)
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self.ax.set_ylim(bottom=y_min + 0, top=y_max - 0)
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# Plot prototypes.
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self.ax.scatter(protos[:, 0],
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protos[:, 1],
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c=label_colors,
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**self.protos_scatter_settings)
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# self._show_and_save(epoch)
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def on_epoch_end(self, trainer, pl_module, logs={}):
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epoch = trainer.current_epoch
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self._display_logs(self.ax, epoch, logs)
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self._show_and_save(epoch)
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