Replace raise by warning to unblock unrecognized torchao version (#3338)

Summary:

As title.

Differential Revision: D87008228

Author: Kai Li

torchao/__init__.py

@@ -6,6 +6,7 @@
 import warnings
 
 import torch
+from torchao.utils import is_fbcode
 
 warnings.filterwarnings(
     "ignore", message="Failed to initialize NumPy: No module named 'numpy'"
@@ -48,7 +49,7 @@ def _parse_version(version_string):
 force_skip_loading_so_files = (
     os.getenv("TORCHAO_FORCE_SKIP_LOADING_SO_FILES", "0") == "1"
 )
-if force_skip_loading_so_files:
+if force_skip_loading_so_files or is_fbcode():
     # user override
     # users can set env var TORCHAO_FORCE_SKIP_LOADING_SO_FILES=1 to skip loading .so files
     # this way, if they are using an incompatbile torch version, they can still use the API by setting the env var