code: def test_GBDT_perf_tree_trav_multi_classifier_converter(self):
      self._run_GB_trees_classifier_converter(
          3, extra_config={"tree_implementation": "perf_tree_trav"}
      )
  
imports: import unittest
  import warnings
  import numpy
  from sklearn.ensemble import GradientBoostingClassifier, GradientBoostingRegressor
  from hummingbird.ml._utils import onnx_ml_tools_installed, onnx_runtime_installed
  import hummingbird.ml
  from tree_utils import gbdt_implementation_map
label_desc: Use image node_id 11 for calling the TestSklearnGradientBoostingConverter obj's underlying member method code with example usage: obj.test_GBDT_perf_tree_trav_multi_classifier_converter() without return types