code: def make_name_to_disk_dict(mapping_table: str):
      """
      The Switchboard data is spread across 4 DVDs
      represented by directories ("swb1_d1", "swb1_d2" and so on).
      This function creates a lookup dictionary to map a given filename to the
      disk it was stored on.
      This information is useful to assemble the absolute path to the sph audio
      files.
  
      Parameters
      ----------
      mapping_table : str
          String representing the path to the mapping table file "swb1_all.dvd.tbl"
          provided along with the rest of the Switchboard data.
  
      Returns
      -------
      name2disk : dict
          A dictionary that maps from sph filename (key) to disk-id (value)
      """
      name2disk = {}
      with open(mapping_table) as mt:
          for line in mt:
              split = line.split()
              name = split[1].strip()
              name2disk[name] = split[0].strip()
      return name2disk
  
imports: import re
  import csv
  import logging
  import os
  from collections import defaultdict
  from speechbrain.dataio.dataio import merge_csvs
  from speechbrain.utils.data_utils import download_file, get_all_files
label_desc: Use image node_id 15 for calling a global function with example usage: make_name_to_disk_dict(mapping_table) and returns: name2disk