code: def fit(self, X, y):
      return self
  
file_path: modAL/tests/example_tests/multidimensional_data.py
imports: import numpy
  from modAL.batch import uncertainty_batch_sampling
  from modAL.expected_error import expected_error_reduction
  from modAL.models import ActiveLearner
  from modAL.uncertainty import entropy_sampling, margin_sampling
  from sklearn.base import BaseEstimator
label_desc: Use image node_id 2 for calling the MockClassifier obj's underlying member method code with example usage: obj.fit(X, y) and returns: self