code: def pack_zero(file_id, number, length=4):
      number = str(number)
      return file_id + "_" + "0" * (length - len(number)) + number
  
file_path: espnet/egs2/kiritan/svs1/pyscripts/utils/prep_segments_from_xml.py
imports: import argparse
  import math
  import os
  import sys
  import music21
  from espnet2.fileio.score_scp import SingingScoreWriter, XMLReader
label_desc: Use image node_id 1 for calling a global function with example usage: pack_zero(file_id, number, length) and returns: unknown