code: def test_boston_OHE_plus_trees_with_huber_loss(self):
      self._test_boston_OHE_plus_trees(loss="huber")
  
file_path: coremltools/coremltools/test/sklearn_tests/test_composite_pipelines.py
imports: import unittest
  from distutils.version import StrictVersion
  import pandas
  from coremltools._deps import _HAS_SKLEARN, _SKLEARN_VERSION
  from coremltools.converters.sklearn import convert
  from coremltools.models.utils import _is_macos, _macos_version, evaluate_regressor, evaluate_transformer
label_desc: Use image node_id 4 for calling the GradientBoostingRegressorBostonHousingScikitNumericTest obj's underlying member method code with example usage: obj.test_boston_OHE_plus_trees_with_huber_loss() without return types