code: def y_multi(self):
      y0 = np.zeros(100)
      y1 = np.repeat(1, 100)
      y2 = np.repeat(2, 100)
      return pd.Series(np.uint8(np.concatenate([y0, y1, y2])))
  
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 3 for calling the TestCalculateRelevanceTable obj's underlying member method code with example usage: obj.y_multi() and returns: pd