more plots

1 files changed, 62 insertions, 22 deletions

diff --git a/plots.py b/plots.py
index dd4706b..db5f009 100644
--- a/plots.py
+++ b/plots.py
@@ -2,28 +2,19 @@ import matplotlib.pyplot as plt
 from matplotlib.gridspec import GridSpec
 import numpy as np
 from torchvision import datasets
+import torch
+import os
+from rich.progress import track
 
+from main import UNet, q_xt_xt_1, p_xt_1_xt
 
-def q_xt_x0(x0, t):
-    alpha_bar = ALPHA_BAR[t]
-    mean = np.sqrt(alpha_bar) * x0
-    std = np.sqrt(1 - alpha_bar)
 
-    eps = np.random.normal(0, 1, x0.shape)
-    xt = mean + std * eps
+os.makedirs('plots', exist_ok=True)
+os.makedirs('plots/diffusion', exist_ok=True)
+os.makedirs('plots/diffusion_inverse', exist_ok=True)
 
-    return xt, eps
-
-def q_xt_xt_1(xt_1, t):
-    alpha = ALPHA[t]
-    mean = np.sqrt(alpha) * xt_1
-    std = np.sqrt(1 - alpha)
-
-    eps = np.random.normal(0, 1, xt_1.shape)
-    xt = mean + std * eps
-
-    return xt, eps
 
+DEVICE = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
 
 DIFFU_STEPS = 1000
 BETA = np.linspace(1e-4, 2e-2, DIFFU_STEPS)
@@ -46,6 +37,7 @@ plt.savefig('plots/alpha_beta.tmp.png')
 
 mnist = datasets.MNIST('data', train=True, download=True)
 img = mnist.data[np.random.randint(0, len(mnist))].numpy() / 255
+img = img * 2 - 1
 
 plt.figure()
 plt.imshow(img, cmap='gray')
@@ -68,24 +60,72 @@ x_norm = np.linspace(BIN_MIN, BIN_MAX, 100)
 y_norm = norm_dist(x_norm, 0, 1) * 28**2 / NB_BINS * (BIN_MAX - BIN_MIN)
 
 fig = plt.figure(figsize=(10, 5))
+fig.suptitle('Diffusion naturelle')
 gs = GridSpec(1, 3, figure=fig)
 ax1 = fig.add_subplot(gs[0, 0])
 ax2 = fig.add_subplot(gs[0, 1:])
 
-xt = img
-for t in range(DIFFU_STEPS):
+plots_to_save = np.linspace(1, DIFFU_STEPS, 100).astype(int)
+
+xt = torch.tensor(img, device=DEVICE, dtype=torch.float32).unsqueeze(0).unsqueeze(0)
+for t in track(range(1, DIFFU_STEPS+1)):
     xt, eps = q_xt_xt_1(xt, t)
 
+    if t not in plots_to_save:
+        continue
+
+    xt_numpy = xt.cpu().detach().numpy()[0, 0]
+
     ax1.clear()
-    ax1.imshow(xt, cmap='gray')
-    ax1.set_title(f'xt at t={t}')
+    ax1.imshow(xt_numpy, cmap='gray')
+    ax1.set_title(f'xt at t={t:04d}')
     ax1.axis('off')
 
     ax2.clear()
-    ax2.hist(xt.flatten(), bins=NB_BINS, range=(BIN_MIN, BIN_MAX))
+    ax2.hist(xt_numpy.flatten(), bins=NB_BINS, range=(BIN_MIN, BIN_MAX))
     ax2.plot(x_norm, y_norm, color='red', label='N(0, 1)')
+    ax2.legend()
     ax2.set_yscale('log')
     ax2.set_ylim(y_norm.min(), 1e3)
     ax2.set_title(f'xt histogram')
 
     fig.savefig(f'plots/diffusion/{t:04d}.tmp.png')
+os.system('convert --delay 20 --repeat 0 plots/diffusion/*.png plots/diffusion.tmp.gif')
+
+
+
+model = UNet().to(DEVICE)
+model.load_state_dict(torch.load('model.pth'))
+
+fig = plt.figure(figsize=(10, 5))
+fig.suptitle('Diffusion inverse')
+gs = GridSpec(1, 3, figure=fig)
+ax1 = fig.add_subplot(gs[0, 0])
+ax2 = fig.add_subplot(gs[0, 1:])
+
+xt = torch.randn(1, 1, 28, 28, device=DEVICE)
+vec = torch.zeros(1, 10).to(DEVICE)
+for t in track(range(DIFFU_STEPS, 0, -1)):
+    t_tensor = torch.tensor([[t]], device=DEVICE, dtype=torch.float32)
+    xt = p_xt_1_xt(model, xt, t_tensor, vec)
+
+    if t not in plots_to_save:
+        continue
+
+    xt_numpy = xt.cpu().detach().numpy()[0, 0]
+
+    ax1.clear()
+    ax1.imshow(xt_numpy, cmap='gray')
+    ax1.set_title(f'xt at t={t:04d}')
+    ax1.axis('off')
+
+    ax2.clear()
+    ax2.hist(xt_numpy.flatten(), bins=NB_BINS, range=(BIN_MIN, BIN_MAX))
+    ax2.plot(x_norm, y_norm, color='red', label='N(0, 1)')
+    ax2.legend()
+    ax2.set_yscale('log')
+    ax2.set_ylim(y_norm.min(), 1e3)
+    ax2.set_title(f'xt histogram')
+
+    fig.savefig(f'plots/diffusion_inverse/{t:04d}.tmp.png')
+os.system('convert --delay 20 --repeat 0 -reverse plots/diffusion_inverse/*.png plots/diffusion_inverse.tmp.gif')