remove too tricky code

x2paddle/op_mapper/onnx2paddle/opset9/opset.py

@@ -891,8 +891,6 @@ class OpSet9():
                                  'this is not supported')
         if len(value) == 1:
             value = value[0]
-            if dtype.name == 'int64':
-                dtype = 'int32'
             attr = {
                 'shape': val_shape.layer_name,
                 'dtype': string(dtype),
@@ -1037,12 +1035,16 @@ class OpSet9():
     @print_mapping_info
     def Concat(self, node):
         inputs = []
+        dtypes = set()
         for i in range(len(node.layer.input)):
             ipt = self.graph.get_input_node(node, idx=i, copy=True)
             if isinstance(ipt, str):
                 inputs.append(ipt)
             else:
                 inputs.append(ipt.layer_name)
+                dtypes.add(ipt.dtype)
+        if len(dtypes) > 1:
+            assert 'Unspported situation happened, please create issue on https://github.com/PaddlePaddle/X2Paddle/issues.'
         axis = node.get_attr('axis')
         attr = {'axis': axis}
         node.fluid_code.add_layer(