add register_pre_forward_hook

python/jittor/__init__.py

@@ -560,6 +560,21 @@ class Module:
             return ret
         self.__class__.__call__ = new_call
 
+    def register_pre_forward_hook(self, func):
+        cls = self.__class__
+        self.__fhook2__ = func
+        if hasattr(cls, "__hooked2__"):
+            return
+        cls.__hooked2__ = True
+        origin_call = cls.__call__
+        def new_call(self, *args, **kw):
+            if hasattr(self, "__fhook2__"):
+                if len(kw):
+                    self.__fhook2__(self, args, kw)
+                else:
+                    self.__fhook2__(self, args)
+            return origin_call(self, *args, **kw)
+        self.__class__.__call__ = new_call
 
     def children(self):
         cd = []