code: def fit(self, X, y, sample_weight):
      pass
  
file_path: fairlearn/test/unit/reductions/exponentiated_gradient/simple_learners.py
imports: import numpy
  import pandas
label_desc: Use image node_id 1 for calling the MockEstimator obj's underlying member method code with example usage: obj.fit(X, y, sample_weight) without return types