code: def forward(self, x, start_axis=0, stop_axis=-1, name=None):
      return paddle.flatten(x, start_axis, stop_axis, name)
  
imports: import paddle
  import paddle.nn
label_desc: Use image node_id 2 for calling the Flatten obj's underlying member method code with example usage: obj.forward(x, start_axis, stop_axis, name) and returns: paddle