code: def y_real(self):
      return pd.Series([0.1, 0.2, 0.1])
  
imports: import warnings
  import mock
  import numpy
  import pandas
  import pytest
  from tsfresh.feature_selection.relevance import calculate_relevance_table, combine_relevance_tables, get_feature_type, infer_ml_task
label_desc: Use image node_id 2 for calling the TestCalculateRelevanceTable obj's underlying member method code with example usage: obj.y_real() and returns: pd