code: def sample_y_at_train_belongs_test_data(self):
      return self.generate_random_data()
  
imports: from ._base import BaseEstimatorTestData
label_desc: Use image node_id 4 for calling the WrappedGaussianProcessTestData obj's underlying member method code with example usage: obj.sample_y_at_train_belongs_test_data() and returns: self