code: def setUp(self):
      # self.df = pd.read_csv(os.path.join(DATA_PATH,'dgp_1/acic_1_1_data.csv'))
      # self.ate = np.mean(self.df['y1'] - self.df['y0'])
      # treated = self.df[self.df['z']==1]
      # self.att = np.mean(treated['y1'] - treated['y0'])
      self.df = None
      self.ate = 1
  
file_path: dowhy/tests/test_causal_estimator.py
imports: import unittest
  import pytest
  from dowhy.causal_estimator import CausalEstimator
label_desc: Use image node_id 1 for calling the TestCausalEstimator obj's underlying member method code with example usage: obj.setUp() without return types