Fix: use direct HTTP requests for predictions.zip to avoid hf_hub_download locking on LFS pointer

app/utils/download.py

@@ -44,41 +44,24 @@ def ensure_predictions_zip(root: str) -> str | None:
     if os.path.exists(zip_path) and os.path.getsize(zip_path) > 10000:
         return zip_path
 
-    # Download from HuggingFace repo
-    print("⬇️ Downloading predictions.zip from HuggingFace...")
-    logger.info("Downloading predictions.zip from HuggingFace...")
+    # Download from HuggingFace repo via direct HTTP (bypasses LFS/cache issues)
+    url = f"https://huggingface.co/spaces/{HF_REPO}/resolve/main/predictions.zip"
+    print(f"⬇️ Downloading predictions.zip from {url}...")
+    logger.info(f"Downloading predictions.zip from HuggingFace via HTTP")
+    
     try:
-        from huggingface_hub import hf_hub_download
-        # First try downloading to root dir
-        downloaded = hf_hub_download(
-            repo_id=HF_REPO,
-            filename="predictions.zip",
-            repo_type="space",
-            local_dir=root,
-        )
-        sz = os.path.getsize(downloaded)
-        print(f"✅ Downloaded predictions.zip: {sz / 1e6:.0f} MB")
-        logger.info(f"Downloaded predictions.zip: {sz} bytes → {downloaded}")
-        return downloaded
-    except Exception as e:
-        logger.warning(f"HF download (local_dir) failed: {e}")
-        print(f"⚠️ Download to local_dir failed: {e}")
-
-    # Fallback: download to HF cache (always works)
-    try:
-        from huggingface_hub import hf_hub_download
-        downloaded = hf_hub_download(
-            repo_id=HF_REPO,
-            filename="predictions.zip",
-            repo_type="space",
-        )
-        sz = os.path.getsize(downloaded)
-        print(f"✅ Downloaded predictions.zip (cache): {sz / 1e6:.0f} MB")
-        logger.info(f"Downloaded predictions.zip (cache): {sz} bytes → {downloaded}")
-        return downloaded
+        # Overwrite the LFS pointer file directly
+        if download_file(url, zip_path, "predictions.zip"):
+            sz = os.path.getsize(zip_path)
+            print(f"✅ Downloaded predictions.zip: {sz / 1e6:.0f} MB")
+            logger.info(f"Downloaded predictions.zip: {sz} bytes → {zip_path}")
+            return zip_path
+        else:
+            print(f"⚠️ HTTP download_file returned False for {url}")
+            logger.warning("HTTP download_file returned False.")
     except Exception as e:
-        logger.error(f"HF download (cache) failed: {e}")
-        print(f"❌ Download failed: {e}")
+        print(f"❌ Exception downloading predictions.zip: {e}")
+        logger.error(f"Exception downloading predictions.zip: {e}")
 
     return None