code: def _add_spk2gender(self, spk, gender):
      self.spk2gender.append("{} {}".format(spk, gender))
  
file_path: espnet/egs2/dsing/asr1/local/data_prep.py
imports: import argparse
  import hashlib
  import json
  import re
  from os import listdir, makedirs
  from os.path import exists, isfile, join
label_desc: Use image node_id 4 for calling the DataSet obj's underlying member method code with example usage: obj._add_spk2gender(spk, gender) without return types