Fix: auto-download predictions.zip from HF if not found or LFS pointer

app/utils/data_loader.py

@@ -24,9 +24,27 @@ def _get_zip_namelist(zip_path: str) -> list[str]:
 
 
 def get_predictions_zip(root: str) -> str | None:
-    """Find predictions.zip in the root directory."""
+    """Find valid predictions.zip (not an LFS pointer) in the root directory.
+    
+    If not found locally or is an LFS pointer, try to download from HF.
+    """
     zip_path = os.path.join(root, "predictions.zip")
-    return zip_path if os.path.exists(zip_path) else None
+    
+    # Check if it exists and is a real file (not LFS pointer ~134 bytes)
+    if os.path.exists(zip_path) and os.path.getsize(zip_path) > 10000:
+        return zip_path
+    
+    # Try auto-downloading from HuggingFace
+    try:
+        from app.utils.download import ensure_predictions_zip
+        result = ensure_predictions_zip(root)
+        if result and os.path.exists(result) and os.path.getsize(result) > 10000:
+            logger.info(f"Auto-downloaded predictions.zip: {os.path.getsize(result)} bytes")
+            return result
+    except Exception as e:
+        logger.warning(f"Auto-download failed: {e}")
+    
+    return None
 
 
 def find_predictions_dir(root: str) -> str | None: