code: def dali_reflect_pad_graph(x, pad_amount):
      pad_start = x[pad_amount:0:-1]
      pad_end = x[-2 : -pad_amount - 2 : -1]
      x = fn.cat(pad_start, x, pad_end, axis=0)
      return x
  
imports: import nose_utils
  import nvidia.dali.fn
  from nvidia.dali import pipeline_def
  import nvidia.dali.types
  from test_utils import get_files, to_array
  import numpy
  import librosa
  import torch
  import math
  import random
  import os
  from nose.tools import nottest
label_desc: Use image node_id 13 for calling a global function with example usage: dali_reflect_pad_graph(x, pad_amount) and returns: x