code: def test_default_diabetes(self):
      if self.__class__ == BaseRegressionComponentTest:
          return
  
      for i in range(2):
          with ignore_warnings(regressor_warnings):
              predictions, targets, n_calls = _test_regressor(
                  dataset="diabetes", Regressor=self.module
              )
  
          self.assertAlmostEqual(
              self.res["default_diabetes"],
              sklearn.metrics.r2_score(targets, predictions),
              places=self.res.get("default_diabetes_places", 7),
          )
  
          if self.res.get("diabetes_n_calls"):
              self.assertEqual(self.res["diabetes_n_calls"], n_calls)
  
imports: from typing import Container, Type
  import numpy
  import sklearn.metrics
  from autosklearn.pipeline.components.regression import RegressorChoice, _regressors
  from autosklearn.pipeline.components.regression.libsvm_svr import LibSVM_SVR
  from autosklearn.pipeline.constants import SPARSE
  from autosklearn.pipeline.util import _test_regressor, _test_regressor_iterative_fit
  import pytest
  import unittest
  from test.test_pipeline.ignored_warnings import ignore_warnings, regressor_warnings
label_desc: Use image node_id 5 for calling the BaseRegressionComponentTest obj's underlying member method code with example usage: obj.test_default_diabetes() without return types