code: def test_accepts_series(self):
      test_data = pd.Series(
          [1.0, 2.0, 4.0],
          index=pd.to_datetime(
              ["2014-01-01", "2014-01-02", "2014-01-04"]
          ),
      )
      regularized_series = regularization.regularize_series(test_data)
      self.assertIsInstance(regularized_series, pd.Series)
      self.assertLen(regularized_series, 4)
  
file_path: probability/tensorflow_probability/python/sts/regularization_test.py
imports: import datetime
  from absl.testing import parameterized
  import numpy
  import pandas
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.sts import regularization
label_desc: Use image node_id 7 for calling the RegularizationTest obj's underlying member method code with example usage: obj.test_accepts_series() without return types