code: def err(l1, l2):
      return np.max([np.max(np.abs(a[0] - a[1])) for a in zip(l1, l2)])
  
imports: from nvidia.dali.pipeline import Pipeline
  from nvidia.dali import backend
  import nvidia.dali.ops
  import numpy
  from test_utils import dali_type
  from nvidia.dali import fn, pipeline_def, types
  from nose2.tools import params
label_desc: Use image node_id 10 for calling a global function with example usage: err(l1, l2) and returns: np