code: def test_multiclass_classes(train_data):
      X, y = train_data
      clf = SVRGClassifier()
      clf.fit(X, y)
      assert list(clf.classes_) == [0, 1, 2]
  
file_path: lightning/lightning/impl/tests/test_svrg.py
imports: import numpy
  from lightning.classification import SVRGClassifier
  from lightning.regression import SVRGRegressor
label_desc: Use image node_id 5 for calling a global function with example usage: test_multiclass_classes(train_data) without return types