Fix: lazy torch import in inference.py — page loads without torch installed

app/utils/inference.py

@@ -1,5 +1,5 @@
 """PETIMOT inference utilities for custom proteins."""
-import os, sys, torch
+import os, sys
 import numpy as np
 from pathlib import Path
 
@@ -24,9 +24,15 @@ def run_inference(pdb_path: str, weights_path: str, config_path: str = None,
     Returns:
         dict with modes, ca_coords, seq, etc.
     """
+    try:
+        import torch
+    except ImportError:
+        raise ImportError("PyTorch is required to run inference. Install it with: pip install torch")
+
     from petimot.infer.infer import infer
     from petimot.data.pdb_utils import load_backbone_coordinates
 
+
     if config_path is None:
         config_path = os.path.join(PETIMOT_ROOT, "configs", "default.yaml")