code: def test_predict_before_training(self):
      lr_attacker = models.LogisticRegressionAttacker()
      self.assertRaises(AssertionError, lr_attacker.predict, [])
  
file_path: privacy/tensorflow_privacy/privacy/privacy_tests/membership_inference_attack/models_test.py
imports: from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  from tensorflow_privacy.privacy.privacy_tests.membership_inference_attack import models
  from tensorflow_privacy.privacy.privacy_tests.membership_inference_attack.data_structures import AttackInputData
  from tensorflow_privacy.privacy.privacy_tests.membership_inference_attack.data_structures import AttackType
label_desc: Use image node_id 2 for calling the TrainedAttackerTest obj's underlying member method code with example usage: obj.test_predict_before_training() without return types