code: def test_generate(art_warning, fix_get_mnist_subset, fix_get_rcnn):
      try:
          (_, _, x_test_mnist, y_test_mnist) = fix_get_mnist_subset
  
          frcnn = fix_get_rcnn
          attack = DPatch(
              frcnn,
              patch_shape=(4, 4, 1),
              learning_rate=1.0,
              max_iter=1,
              batch_size=1,
              verbose=False,
          )
          patch = attack.generate(x=x_test_mnist[[0]])
          assert patch.shape == (4, 4, 1)
  
          attack.apply_patch(x=x_test_mnist)
          attack.apply_patch(x=x_test_mnist, patch_external=patch)
          attack.apply_patch(
              x=x_test_mnist,
              patch_external=patch,
              mask=np.ones((1, 28, 28)).astype(bool),
          )
          attack.apply_patch(
              x=x_test_mnist,
              patch_external=patch,
              mask=np.ones((1, 28, 28)).astype(bool),
              random_location=True,
          )
  
          patch = attack.generate(x=x_test_mnist[[0]], target_label=1)
          assert patch.shape == (4, 4, 1)
          patch = attack.generate(
              x=x_test_mnist[[0]], target_label=np.array([1])
          )
          assert patch.shape == (4, 4, 1)
          patch = attack.generate(x=x_test_mnist[[0]], target_label=[1])
          assert patch.shape == (4, 4, 1)
  
          with pytest.raises(ValueError):
              _ = attack.generate(
                  x=np.repeat(x_test_mnist, axis=3, repeats=2)
              )
  
      except ARTTestException as e:
          art_warning(e)
  
file_path: adversarial-robustness-toolbox/tests/attacks/evasion/test_dpatch.py
imports: import logging
  import numpy
  import pytest
  from art.attacks.evasion import DPatch
  from art.estimators.estimator import BaseEstimator, LossGradientsMixin
  from art.estimators.object_detection.object_detector import ObjectDetectorMixin
  from tests.attacks.utils import backend_test_classifier_type_check_fail
  from tests.utils import master_seed
  from tests.utils import ARTTestException
label_desc: Use image node_id 2 for calling a global function with example usage: test_generate(art_warning, fix_get_mnist_subset, fix_get_rcnn) without return types