rm useless code

x2paddle/op_mapper/onnx2paddle/opset9/opset.py

@@ -1150,9 +1150,7 @@ class OpSet9():
         val_x = self.graph.get_input_node(node, idx=0, copy=True)
         starts, ends, axes, steps = None, None, None, None
         layer_attrs = {}
-        if val_x.dtype not in [
-                "float16", "float32", "float64", "int32", "int64"
-        ]:
+        if val_x.dtype == 'uint8':
             self.paddle_graph.add_layer(
                 'paddle.cast',
                 inputs={"x": val_x.name},
@@ -1878,6 +1876,7 @@ class OpSet9():
         if axes is None:
             axes_node = self.graph.get_input_node(node, idx=1, copy=True)
             axes = _const_weight_or_none(axes_node, necessary=True)
+        # deal with scalar(0D) tensor
         if len(val_x.out_shapes[0]) <= 1 and len(axes) == 1 and axes[0] == 0:
             self.paddle_graph.add_layer(
                 "paddle.cast",