1 files changed, 36 insertions, 6 deletions
diff --git a/training/train_cnn.py b/training/train_cnn.py
index dc14192..ef7a0ae 100755
--- a/training/train_cnn.py
+++ b/training/train_cnn.py
@@ -240,10 +240,12 @@ class SimpleCNN(nn.Module):
                 # Final layer: 7→1 (grayscale output)
                 self.layers.append(nn.Conv2d(7, 1, kernel_size=kernel_size, padding=padding, bias=True))
 
-    def forward(self, x):
+    def forward(self, x, return_intermediates=False):
         # x: [B,4,H,W] - RGBD input (D = 1/z)
         B, C, H, W = x.shape
 
+        intermediates = [] if return_intermediates else None
+
         # Normalize RGBD to [-1,1]
         x_norm = (x - 0.5) * 2.0
 
@@ -261,18 +263,26 @@ class SimpleCNN(nn.Module):
         layer0_input = torch.cat([x_norm, x_coords, y_coords, gray], dim=1)  # [B,7,H,W]
         out = self.layers[0](layer0_input)  # [B,4,H,W]
         out = torch.tanh(out)  # [-1,1]
+        if return_intermediates:
+            intermediates.append(out.clone())
 
         # Inner layers
         for i in range(1, len(self.layers)-1):
             layer_input = torch.cat([out, x_coords, y_coords, gray], dim=1)
             out = self.layers[i](layer_input)
             out = torch.tanh(out)
+            if return_intermediates:
+                intermediates.append(out.clone())
 
         # Final layer (grayscale output)
         final_input = torch.cat([out, x_coords, y_coords, gray], dim=1)
         out = self.layers[-1](final_input)  # [B,1,H,W]
         out = torch.sigmoid(out)  # Map to [0,1] with smooth gradients
-        return out.expand(-1, 3, -1, -1)
+        final_out = out.expand(-1, 3, -1, -1)
+
+        if return_intermediates:
+            return final_out, intermediates
+        return final_out
 
 
 def generate_layer_shader(output_path, num_layers, kernel_sizes):
@@ -693,7 +703,7 @@ def export_from_checkpoint(checkpoint_path, output_path=None):
     print("Export complete!")
 
 
-def infer_from_checkpoint(checkpoint_path, input_path, output_path, patch_size=32):
+def infer_from_checkpoint(checkpoint_path, input_path, output_path, patch_size=32, save_intermediates=None):
     """Run sliding-window inference to match WGSL shader behavior"""
 
     if not os.path.exists(checkpoint_path):
@@ -724,16 +734,35 @@ def infer_from_checkpoint(checkpoint_path, input_path, output_path, patch_size=3
     # Process full image with sliding window (matches WGSL shader)
     print(f"Processing full image ({W}×{H}) with sliding window...")
     with torch.no_grad():
-        output_tensor = model(img_tensor)  # [1,3,H,W]
+        if save_intermediates:
+            output_tensor, intermediates = model(img_tensor, return_intermediates=True)
+        else:
+            output_tensor = model(img_tensor)  # [1,3,H,W]
 
     # Convert to numpy
     output = output_tensor.squeeze(0).permute(1, 2, 0).numpy()
 
-    # Save
+    # Save final output
     print(f"Saving output to: {output_path}")
     os.makedirs(os.path.dirname(output_path) if os.path.dirname(output_path) else '.', exist_ok=True)
     output_img = Image.fromarray((output * 255).astype(np.uint8))
     output_img.save(output_path)
+
+    # Save intermediates if requested
+    if save_intermediates:
+        os.makedirs(save_intermediates, exist_ok=True)
+        print(f"Saving {len(intermediates)} intermediate layers to: {save_intermediates}")
+        for layer_idx, layer_tensor in enumerate(intermediates):
+            # Convert [-1,1] to [0,1] for visualization
+            layer_data = (layer_tensor.squeeze(0).permute(1, 2, 0).numpy() + 1.0) * 0.5
+            # Take first channel for 4-channel intermediate layers
+            if layer_data.shape[2] == 4:
+                layer_data = layer_data[:, :, :3]  # Show RGB only
+            layer_img = Image.fromarray((layer_data.clip(0, 1) * 255).astype(np.uint8))
+            layer_path = os.path.join(save_intermediates, f'layer_{layer_idx}.png')
+            layer_img.save(layer_path)
+            print(f"  Saved layer {layer_idx} to {layer_path}")
+
     print("Done!")
 
 
@@ -758,6 +787,7 @@ def main():
                         help='Salient point detector for patch extraction (default: harris)')
     parser.add_argument('--early-stop-patience', type=int, default=0, help='Stop if loss changes less than eps over N epochs (default: 0 = disabled)')
     parser.add_argument('--early-stop-eps', type=float, default=1e-6, help='Loss change threshold for early stopping (default: 1e-6)')
+    parser.add_argument('--save-intermediates', help='Directory to save intermediate layer outputs (inference only)')
 
     args = parser.parse_args()
 
@@ -769,7 +799,7 @@ def main():
             sys.exit(1)
         output_path = args.output or 'inference_output.png'
         patch_size = args.patch_size or 32
-        infer_from_checkpoint(checkpoint, args.infer, output_path, patch_size)
+        infer_from_checkpoint(checkpoint, args.infer, output_path, patch_size, args.save_intermediates)
         return
 
     # Export-only mode