Supporting obj is not an object. (#621)

测试：
```shell
from onediff.infer_compiler.transform import torch2oflow
import torch 
mod = torch.nn.Linear 
# Convert to oneflow
of_mod = torch2oflow(mod)
print(of_mod) # <class 'oneflow.nn.modules.linear.Linear'>
x = 9 
print(f'{isinstance(x, type)=}') # isinstance(x, type)=False
```

src/onediff/infer_compiler/import_tools/importer.py

@@ -15,6 +15,8 @@ def is_need_mock(cls) -> bool:
     assert isinstance(cls, (type, str))
     main_pkg = cls.__module__.split(".")[0]
     try:
+        if main_pkg == "torch":
+            return True
         pkgs = requires(main_pkg)
     except Exception as e:
         return True

src/onediff/infer_compiler/transform/builtin_transform.py

@@ -1,4 +1,5 @@
 """Convert torch object to oneflow object."""
+
 import os
 import importlib
 import types
@@ -105,7 +106,10 @@ def __getattribute__(self, attribute):
         ):
             return flow.Generator()
         elif (
-            isinstance(self._oflow_proxy_submod, (torch.nn.Conv1d, torch.nn.Conv2d, torch.nn.Conv3d))
+            isinstance(
+                self._oflow_proxy_submod,
+                (torch.nn.Conv1d, torch.nn.Conv2d, torch.nn.Conv3d),
+            )
             and attribute == "channel_pos"
         ):
             return "channels_first"
@@ -148,6 +152,13 @@ def torch2oflow(mod, *args, **kwargs):
     return default_converter(mod, *args, **kwargs)
 
 
+@torch2oflow.register
+def _(mod: type):
+    if not is_need_mock(mod):
+        return mod
+    return proxy_class(mod)
+
+
 def default_converter(obj, verbose=False, *, proxy_cls=None):
     # Higher versions of diffusers might use torch.nn.modules.Linear
     if obj is torch.nn.Linear:
@@ -162,7 +173,7 @@ def init(self):
             for k, _ in obj.__dict__.items():
                 attr = getattr(obj, k)
                 self.__dict__[k] = torch2oflow(attr)
-  
+
         of_obj_cls = type(str(new_obj_cls), (new_obj_cls,), {"__init__": init})
         of_obj = of_obj_cls()
 
@@ -174,11 +185,12 @@ def init(self):
         # raise NotImplementedError(f"Unsupported type: {obj}")
         return obj
 
+
 @torch2oflow.register
 def _(mod: torch.nn.Module, verbose=False):
     proxy_md = ProxySubmodule(mod)
     new_md_cls = proxy_class(type(mod))
-    
+
     def init(self):
         nonlocal proxy_md
 
@@ -223,7 +235,7 @@ def proxy_getattr(self, attr):
         str(new_md_cls), (new_md_cls,), {"__init__": init, "__getattr__": proxy_getattr}
     )
     of_mod = of_mod_cls()
-    
+
     if of_mod.training:
         of_mod.training = False
         if verbose:
@@ -244,7 +256,7 @@ def proxy_getattr(self, attr):
 def _(mod: torch.nn.BatchNorm1d, verbose=False):
     of_mod = torch2oflow.dispatch(torch.nn.Module)(mod, verbose)
     of_mod.channel_axis = 1
-    
+
     return of_mod
 
 
@@ -254,7 +266,7 @@ def _(mod: torch.nn.BatchNorm2d, verbose=False):
     if os.getenv("ONEFLOW_ENABLE_NHWC"):
         of_mod.channel_axis = 3
     else:
-        of_mod.channel_axis = 1 
+        of_mod.channel_axis = 1
 
     return of_mod
 
@@ -263,72 +275,72 @@ def _(mod: torch.nn.BatchNorm2d, verbose=False):
 def _(mod: torch.nn.BatchNorm3d, verbose=False):
     of_mod = torch2oflow.dispatch(torch.nn.Module)(mod, verbose)
     of_mod.channel_axis = 1
-    
+
     return of_mod
 
 
 @torch2oflow.register
 def _(mod: torch.nn.MaxPool1d, verbose=False):
     of_mod = torch2oflow.dispatch(torch.nn.Module)(mod, verbose)
-    of_mod.channel_pos = 'channels_first'
-    
+    of_mod.channel_pos = "channels_first"
+
     return of_mod
 
 
 @torch2oflow.register
 def _(mod: torch.nn.MaxPool2d, verbose=False):
     of_mod = torch2oflow.dispatch(torch.nn.Module)(mod, verbose)
     if os.getenv("ONEFLOW_ENABLE_NHWC"):
-        of_mod.channel_pos = 'channels_last'
+        of_mod.channel_pos = "channels_last"
     else:
-        of_mod.channel_pos = 'channels_first'
-    
+        of_mod.channel_pos = "channels_first"
+
     return of_mod
 
 
 @torch2oflow.register
 def _(mod: torch.nn.MaxPool3d, verbose=False):
     of_mod = torch2oflow.dispatch(torch.nn.Module)(mod, verbose)
-    of_mod.channel_pos = 'channels_first'
-    
+    of_mod.channel_pos = "channels_first"
+
     return of_mod
 
 
 @torch2oflow.register
 def _(mod: torch.nn.AvgPool1d, verbose=False):
     of_mod = torch2oflow.dispatch(torch.nn.Module)(mod, verbose)
-    of_mod.channel_pos = 'channels_first'
-    
+    of_mod.channel_pos = "channels_first"
+
     return of_mod
 
 
 @torch2oflow.register
 def _(mod: torch.nn.AvgPool2d, verbose=False):
     of_mod = torch2oflow.dispatch(torch.nn.Module)(mod, verbose)
     if os.getenv("ONEFLOW_ENABLE_NHWC"):
-        of_mod.channel_pos = 'channels_last'
+        of_mod.channel_pos = "channels_last"
     else:
-        of_mod.channel_pos = 'channels_first'
-    
+        of_mod.channel_pos = "channels_first"
+
     return of_mod
 
 
 @torch2oflow.register
 def _(mod: torch.nn.AvgPool3d, verbose=False):
     of_mod = torch2oflow.dispatch(torch.nn.Module)(mod, verbose)
-    of_mod.channel_pos = 'channels_first'
-    
+    of_mod.channel_pos = "channels_first"
+
     return of_mod
 
 
 @torch2oflow.register
 def _(mod: torch.nn.AdaptiveAvgPool2d, verbose=False):
     of_mod = torch2oflow.dispatch(torch.nn.Module)(mod, verbose)
     if os.getenv("ONEFLOW_ENABLE_NHWC"):
-        of_mod.channel_pos = 'channels_last'
+        of_mod.channel_pos = "channels_last"
     else:
-        of_mod.channel_pos = 'channels_first'
-    
+        of_mod.channel_pos = "channels_first"
+
     return of_mod
 
 
@@ -350,7 +362,7 @@ def _(mod: torch.nn.Sequential, verbose=False):
         of_mod_list.append(submod)
 
     of_mod_seq = proxy_class(type(mod))(*of_mod_list)
-    
+
     return of_mod_seq
 
 
@@ -419,6 +431,7 @@ def _(mod, verbose=False) -> Union[int, float, str, bool]:
 def _(mod: None, verbose=False):
     return mod
 
+
 @torch2oflow.register
 def _(mod: types.BuiltinFunctionType, verbose=False):
     if hasattr(mod, "__module__"):