code: def test_validate_chunk_width(self):
      for s in ["64", "64,25,128"]:
          self.assertTrue(validate_chunk_width(s), s)
  
imports: from __future__ import division
  import argparse
  import glob
  import logging
  import os
  import math
  import re
  import shutil
  import libs.common
  from libs.nnet3.train.dropout_schedule import *
  import unittest
label_desc: Use image node_id 2 for calling the SelfTest obj's underlying member method code with example usage: obj.test_validate_chunk_width() without return types