Add gelu pass

x2paddle/optimizer/fusion/onnx_gelu_fuser.py

@@ -64,9 +64,7 @@ class GeluFuser(FuseBase):
                     "y": gen_name(0)},
             outputs=[gen_name(3)])
         self.pattern.add_layer(
-            "paddle.erf",
-            inputs={"x": gen_name(3)},
-            outputs=[gen_name(4)])
+            "paddle.erf", inputs={"x": gen_name(3)}, outputs=[gen_name(4)])
         self.pattern.add_layer(
             "paddle.add",
             inputs={"x": gen_name(4),
@@ -88,7 +86,7 @@ class GeluFuser(FuseBase):
         new_layer, new_layer_id = self.gen_new_layer(parameters, matches)
         graph.layers[new_layer_id] = new_layer
         matches.pop(new_layer_id)
-        
+
     def gen_new_layer(self, parameters, matches):
         layer_id_list = list(matches.keys())
         layer_id_list.sort(key=int)