diff --git a/imperative/python/megengine/traced_module/module_tracer.py b/imperative/python/megengine/traced_module/module_tracer.py
index 59eb5531719494a9052b17f9dd2cf856c2d800f4..a0d5dceb945996b1f95698d253299213e343bf65 100644
--- a/imperative/python/megengine/traced_module/module_tracer.py
+++ b/imperative/python/megengine/traced_module/module_tracer.py
@@ -211,6 +211,8 @@ class Patcher:
         self.wrap_fn = wrap_fn
         for module in self._builtin_modules:
             self.patch_module(module)
+        # some functions in F.nn are import from other module, and not in __all__
+        self.auto_patch(F.nn.__dict__, False)
         for meth in BUILTIN_ARRAY_METHOD:
             self.patch_method(ArrayMethodMixin, meth, self.wrap_fn)
         self.patch_method(Tensor, "detach", self.wrap_fn)
@@ -256,8 +258,8 @@ class Patcher:
                     self.patch_function(module.__dict__, k, self.wrap_fn)
             self.visited_frames_ids.add(id(module.__dict__))
 
-    def auto_patch(self, frame_dict):
-        if id(frame_dict) not in self.visited_frames_ids:
+    def auto_patch(self, frame_dict, check_frame_id=True):
+        if id(frame_dict) not in self.visited_frames_ids or not check_frame_id:
             for k, v in frame_dict.items():
                 if id(v) in self.patched_fn_ids:
                     self.patch_function(frame_dict, k, self.wrap_fn)