Fix: gracefully disable RF-DETR on CPU-only environments

src/streamlit_app.py

@@ -421,6 +421,11 @@ def load_rfdetr():
         print(f"[WARNING] RF-DETR model not found")
         return None
     try:
+        import torch
+        # RF-DETR needs CUDA; if not available, skip gracefully
+        if not torch.cuda.is_available():
+            print("[WARNING] RF-DETR requires GPU (CUDA). Running on CPU — RF-DETR disabled.")
+            return None
         from rfdetr import RFDETRBase
         model = RFDETRBase(pretrain_weights=str(rfdetr_path))
         print(f"[OK] RF-DETR loaded ({rfdetr_path.stat().st_size/1e6:.1f} MB)")