code: def x_target():
      return np.random.random_sample((28, 28, 1))
  
imports: import numpy
  import pytest
  from tests.utils import ARTTestException, master_seed
  from art.attacks.poisoning.backdoor_attack_dgm.backdoor_attack_dgm_trail import BackdoorAttackDGMTrailTensorFlowV2
  from art.estimators.generation.tensorflow import TensorFlowV2Generator
label_desc: Use image node_id 1 for calling a global function with example usage: x_target() and returns: np