code: def test_xgb_tree_trav_regressor_converter(self):
      self._run_xgb_regressor_converter(
          1000, extra_config={"tree_implementation": "tree_trav"}
      )
  
imports: import unittest
  import warnings
  import numpy
  from sklearn.datasets import fetch_california_housing
  from sklearn.model_selection import train_test_split
  import hummingbird.ml
  from hummingbird.ml._utils import xgboost_installed, tvm_installed, pandas_installed
  from hummingbird.ml import constants
  from tree_utils import gbdt_implementation_map
label_desc: Use image node_id 19 for calling the TestXGBoostConverter obj's underlying member method code with example usage: obj.test_xgb_tree_trav_regressor_converter() without return types