fix:Modify keys in the dictionary of layer.stat_dict in dynamic graph mode, test=develop (#17700)

python/paddle/fluid/dygraph/layers.py

@@ -235,20 +235,19 @@ class Layer(core.Layer):
         else:
             object.__delattr__(self, name)
 
-    def state_dict(self, destination=None, prefix='', include_sublayers=True):
+    def state_dict(self, destination=None, include_sublayers=True):
         if destination is None:
             destination = collections.OrderedDict()
         for name, data in self._parameters.items():
             if data is not None:
-                destination[prefix + name] = data
+                destination[data.name] = data
 
         if include_sublayers:
             for layer_name, layer_item in self._sub_layers.items():
                 if layer_item is not None:
                     destination_temp = destination.copy()
                     destination_temp.update(
-                        layer_item.state_dict(destination_temp, prefix +
-                                              layer_name + ".",
+                        layer_item.state_dict(destination_temp,
                                               include_sublayers))
                     destination = destination_temp
         return destination