code: def gen_dummy_meta(num_spk, num_utt_per_spk):
      """Generate a dummy data."""
      meta = kaldi_dir.KaldiMetaData()
      for spk_idx in range(num_spk):
          for utt_idx in range(num_utt_per_spk):
              spk = str(spk_idx)
              utt = "%s_%d" % (spk, utt_idx)
              utt_meta = kaldi_dir.Utt()
              utt_meta.feat = "foo/bar/feat/%s" % (utt)
              utt_meta.vad = "foo/bar/vad/%s" % (utt)
              utt_meta.spk = spk
              meta.utts[utt] = utt_meta
      meta.collect_spks_from_utts()
      return meta
  
file_path: delta/delta/utils/kaldi/kaldi_dir_utils.py
imports: import os
  from random import Random
  from absl import logging
  import numpy
  import kaldiio
  from delta.utils.kaldi import kaldi_dir
label_desc: Use image node_id 1 for calling a global function with example usage: gen_dummy_meta(num_spk, num_utt_per_spk) and returns: meta