expand support dynamic shape

x2paddle/op_mapper/onnx2paddle/opset9/opset.py

@@ -556,25 +556,26 @@ class OpSet9():
     def Expand(self, node):
         val_x = self.graph.get_input_node(node, idx=0, copy=True)
         val_shape = self.graph.get_input_node(node, idx=1, copy=True)
-
         if len(val_shape.outputs) == 1:
             self.omit_nodes.append(val_shape.layer_name)
-
-        val_y = self.graph.get_node(node.layer.output[0], copy=True)
-        out_shape = node.out_shapes[0]
         val_x_dtype = val_x.dtype
-
         name_ones = node.layer_name + '_ones'
-        attr_ones = {'shape': out_shape, 'dtype': string(val_x_dtype)}
+        attr_ones = {
+            'shape': val_shape.layer_name,
+            'dtype': string(val_x_dtype),
+            'value': 1
+        }
         node.fluid_code.add_layer(
-            'ones', inputs=None, output=name_ones, param_attr=attr_ones)
+            'fill_constant',
+            inputs=None,
+            output=name_ones,
+            param_attr=attr_ones)
         inputs = {'x': name_ones, 'y': val_x}
-        attr = {'name': string(node.layer_name)}
         node.fluid_code.add_layer(
             'elementwise_mul',
             inputs=inputs,
             output=node.layer_name,
-            param_attr=attr)
+            param_attr=None)
 
     @print_mapping_info
     def Gather(self, node):
@@ -1341,7 +1342,8 @@ class OpSet9():
             if val_repeats.dtype != 'int32':
                 attr = {"dtype": string("int32")}
                 node.fluid_code.add_layer(
-                    "cast", inputs=repeats, 
+                    "cast",
+                    inputs=repeats,
                     output="{}.tmp".format(repeats),
                     param_attr=attr)
                 repeats = "{}.tmp".format(repeats)