update utils

utils/__init__.py

-import torch.cuda
-import torch.backends
+import torch
 
 def torch_gc(DEVICE):
     if torch.cuda.is_available():
@@ -8,7 +7,6 @@ def torch_gc(DEVICE):
             torch.cuda.ipc_collect()
     elif torch.backends.mps.is_available():
         try:
-            import torch.mps
             torch.mps.empty_cache()
         except Exception as e:
             print(e)