code: def test_save_load_nested_estimator(self):
      self._run_test_save_load_nested_estimator(LogisticRegression)
      self._run_test_save_load_nested_estimator(DummyLogisticRegression)
  
file_path: spark/python/pyspark/ml/tests/tuning/test_cv_io_nested.py
imports: import tempfile
  import unittest
  from pyspark.ml.classification import LogisticRegression, OneVsRest
  from pyspark.ml.evaluation import MulticlassClassificationEvaluator
  from pyspark.ml.linalg import Vectors
  from pyspark.ml.tuning import CrossValidator, CrossValidatorModel, ParamGridBuilder
  from pyspark.testing.mlutils import DummyLogisticRegression, SparkSessionTestCase
  from pyspark.ml.tests.tuning.test_tuning import ValidatorTestUtilsMixin
label_desc: Use image node_id 2 for calling the CrossValidatorIONestedTests obj's underlying member method code with example usage: obj.test_save_load_nested_estimator() without return types