code: def pad(x, pad_width):
      return np.pad(x, pad_width, mode="constant")
  
file_path: objax/tests/functional_pooling.py
imports: import unittest
  import jax.numpy
  import numpy
  import objax
label_desc: Use image node_id 2 for calling a global function with example usage: pad(x, pad_width) and returns: np