code: def __init__(self, n_classes=2):
      self.n_classes = n_classes
  
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 1 to create a new MockClassifier object from inherited base classes: BaseEstimator with example: obj = MockClassifier(n_classes)