code: def test_simple_arithm():
      validate_cpu_vs_gpu(
          arrays_arithmetic, arrays_arithmetic, num_outputs=2
      )
  
file_path: DALI/dali/test/python/test_gpu_python_function_operator.py
imports: import cupy
  from nvidia.dali.pipeline import Pipeline
  import nvidia.dali.ops
  import nvidia.dali.types
  import numpy
  import test_utils
  import random
  import os
label_desc: Use image node_id 4 for calling a global function with example usage: test_simple_arithm() without return types