code: def test_step(x, y):
      val_logits = model(x, training=False)
      val_acc_metric.update_state(y, val_logits)
  
file_path: keras/guides/writing_a_custom_training_loop_in_tensorflow.py
imports: import time
  import os
  import tensorflow
  import keras
  import numpy
label_desc: Use image node_id 3 for calling a global function with example usage: test_step(x, y) without return types