Add warnings for (slower) Torch 1.x and Windows not supporting torch.compile (#1982)

Add warning for torch 1.x and windows

nerfstudio/utils/misc.py

@@ -19,6 +19,7 @@ Miscellaneous helper code.
 
 import platform
 from typing import Any, Callable, Dict, List, Optional, TypeVar, Union
+import warnings
 
 import torch
 
@@ -167,11 +168,17 @@ def torch_compile(*args, **kwargs):
     """
     if not hasattr(torch, "compile"):
         # Backward compatibility for PyTorch 1.x
+        warnings.warn(
+            "PyTorch 1.x will no longer be supported by Nerstudio. Please upgrade to PyTorch 2.x.", DeprecationWarning
+        )
         return torch.jit.script
     elif platform.system() == "Windows":
         # torch.compile is not supported on Windows
         # https://github.com/orgs/pytorch/projects/27
         # TODO: @jkulhanek, remove this once torch.compile is supported on Windows
+        warnings.warn(
+            "Windows does not yet support torch.compile and the performance will be affected.", RuntimeWarning
+        )
         return lambda x: x
     else:
         return torch.compile(*args, **kwargs)