code: def test_autocorr(self):
      pdf = pd.DataFrame({"s1": [0.90010907, 0.13484424, 0.62036035]})
      self._test_autocorr(pdf)
  
      pdf = pd.DataFrame(
          {"s1": [0.90010907, np.nan, 0.13484424, 0.62036035]}
      )
      self._test_autocorr(pdf)
  
      pdf = pd.DataFrame({"s1": [0.2, 0.0, 0.6, 0.2, np.nan, 0.5, 0.6]})
      self._test_autocorr(pdf)
  
      psser = ps.from_pandas(pdf["s1"])
      with self.assertRaisesRegex(
          TypeError, r"lag should be an int; however, got"
      ):
          psser.autocorr(1.0)
  
imports: import unittest
  from decimal import Decimal
  import numpy
  import pandas
  from pyspark import pandas
  from pyspark.testing.pandasutils import ComparisonTestBase
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 20 for calling the SeriesStatMixin obj's underlying member method code with example usage: obj.test_autocorr() without return types