code: def test_ewm_mean(self):
      self._test_ewm_func("mean")
  
file_path: spark/python/pyspark/pandas/tests/window/test_ewm_mean.py
imports: import numpy
  import pandas
  import pyspark.pandas
  from pyspark.testing.pandasutils import PandasOnSparkTestCase, TestUtils
label_desc: Use image node_id 2 for calling the EWMMeanMixin obj's underlying member method code with example usage: obj.test_ewm_mean() without return types