code: def save(self):
      raise Exception(
          "Binary dump is not implemented yet. Please use save_json"
      )
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import turicreate
  import unittest
  import json
  import random
  import numpy
  import pytest
label_desc: Use image node_id 10 for calling the GBDTDecoder obj's underlying member method code with example usage: obj.save() without return types