code: def load_spk2utt(spk2utt_file):
      """Returns dictionary { spkid: list of uttids }."""
      if not os.path.exists(spk2utt_file):
          return None
      lines = [line.strip().split() for line in open(spk2utt_file)]
      return {x[0]: x[1:] for x in lines}
  
imports: from __future__ import print_function
  import io
  import os
  import subprocess
  import sys
  from functools import lru_cache
  import numpy
  import soundfile
label_desc: Use image node_id 7 for calling a global function with example usage: load_spk2utt(spk2utt_file) and returns: unknown, None