code: def test_bin_classes(bin_train_data):
      X_bin, y_bin = bin_train_data
      clf = SVRGClassifier()
      clf.fit(X_bin, y_bin)
      assert list(clf.classes_) == [-1, 1]
  
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 4 for calling a global function with example usage: test_bin_classes(bin_train_data) without return types