code: def predict_one(self, record):
      score_list = [x.calculate_score(record) for x in self.tree_list]
      score = numpy.sum(score_list) + numpy.float32(0.5)
      return score
  
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 2 for calling the GBDTDecoder obj's underlying member method code with example usage: obj.predict_one(record) and returns: score