code: def _compute_L1_error(x, y):
      return np.linalg.norm(x - y, ord=1)
  
file_path: MMdnn/tests/utils.py
imports: from __future__ import absolute_import
  from __future__ import print_function
  import os
  import unittest
  import numpy
label_desc: Use image node_id 3 for calling a global function with example usage: _compute_L1_error(x, y) and returns: np