CNN v2: Add debugging tools for mismatch investigation

Add identity weight generator and composited layer save for debugging
HTML/C++ output differences.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/tools/cnn_v2_test/index.html b/tools/cnn_v2_test/index.html
index ca89fb4..3977d9f 100644
--- a/tools/cnn_v2_test/index.html
+++ b/tools/cnn_v2_test/index.html
@@ -1395,6 +1395,7 @@ class CNNTester {
         const label = `Layer ${i - 1}`;
         html += `<button onclick="tester.visualizeLayer(${i})" id="layerBtn${i}">${label}</button>`;
       }
+      html += `<button onclick="tester.saveCompositedLayer()" style="margin-left: 20px; background: #28a745;">Save Composited</button>`;
       html += '</div>';
 
       html += '<div class="layer-grid" id="layerGrid"></div>';
@@ -1836,6 +1837,64 @@ class CNNTester {
       this.setStatus(`Save failed: ${err.message}`, true);
     }
   }
+
+  async saveCompositedLayer() {
+    if (!this.currentLayerIdx) {
+      this.log('No layer selected for compositing', 'error');
+      return;
+    }
+
+    try {
+      const canvases = [];
+      for (let i = 0; i < 4; i++) {
+        const canvas = document.getElementById(`layerCanvas${i}`);
+        if (!canvas) {
+          this.log(`Canvas layerCanvas${i} not found`, 'error');
+          return;
+        }
+        canvases.push(canvas);
+      }
+
+      const width = canvases[0].width;
+      const height = canvases[0].height;
+      const compositedWidth = width * 4;
+
+      // Create composited canvas
+      const compositedCanvas = document.createElement('canvas');
+      compositedCanvas.width = compositedWidth;
+      compositedCanvas.height = height;
+      const ctx = compositedCanvas.getContext('2d');
+
+      // Composite horizontally
+      for (let i = 0; i < 4; i++) {
+        ctx.drawImage(canvases[i], i * width, 0);
+      }
+
+      // Convert to grayscale
+      const imageData = ctx.getImageData(0, 0, compositedWidth, height);
+      const pixels = imageData.data;
+      for (let i = 0; i < pixels.length; i += 4) {
+        const gray = 0.299 * pixels[i] + 0.587 * pixels[i + 1] + 0.114 * pixels[i + 2];
+        pixels[i] = pixels[i + 1] = pixels[i + 2] = gray;
+      }
+      ctx.putImageData(imageData, 0, 0);
+
+      // Save as PNG
+      const blob = await new Promise(resolve => compositedCanvas.toBlob(resolve, 'image/png'));
+      const url = URL.createObjectURL(blob);
+      const a = document.createElement('a');
+      a.href = url;
+      a.download = `composited_layer${this.currentLayerIdx}_${compositedWidth}x${height}.png`;
+      a.click();
+      URL.revokeObjectURL(url);
+
+      this.log(`Saved composited layer: ${a.download}`);
+      this.setStatus(`Saved: ${a.download}`);
+    } catch (err) {
+      this.log(`Failed to save composited layer: ${err.message}`, 'error');
+      this.setStatus(`Compositing failed: ${err.message}`, true);
+    }
+  }
 }
 
 const tester = new CNNTester();