docstr: get model weight default path and download url
docstr_tok: ["get","model","weight","default","path","and","download","url"]
code: def weights_info(self):
      "get model weight default path and download url"
      raise NotImplementError(self, self.weights_info)
  
imports: import os
  import logging
  import paddle.fluid
label_desc: Use image node_id 9 for calling the ModelBase obj's underlying member method code with example usage: obj.weights_info() without return types