[dynamo] Turn on guard_nn_modules

torch/_dynamo/config.py

@@ -87,7 +87,7 @@
 allow_ignore_mark_dynamic = False
 
 # Set this to False to assume nn.Modules() contents are immutable (similar assumption as freezing)
-guard_nn_modules = False
+guard_nn_modules = True
 
 # Uses CPython internal dictionary tags to detect mutation. There is some
 # overlap between guard_nn_modules_using_dict_tags and guard_nn_modules flag.