code: def parse_time_str(time_value_str):
      if not (
          time_value_str is not None
          and len(time_value_str) == 12
          and time_value_str[2] == ":"
          and time_value_str[5] == ":"
          and time_value_str[8] == ","
      ):
          return None
      try:
          return (
              int(time_value_str[0:2]) * 3600
              + int(time_value_str[3:5]) * 60
              + int(time_value_str[6:8])
          )
      except ValueError:
          return None
  
imports: import parlai.core.build_data
  import glob
  import gzip
  import multiprocessing
  import os
  import re
  import sys
  import time
  import tqdm
  import xml.etree.ElementTree
  from parlai.core.build_data import DownloadableFile
  from parlai.utils.io import PathManager
label_desc: Use image node_id 7 for calling a global function with example usage: parse_time_str(time_value_str) and returns: None, unknown, None