code: def pack_zero(file_id, number, length=4):
      number = str(number)
      return file_id + "_" + "0" * (length - len(number)) + number
  
file_path: espnet/egs2/pjs/svs1/local/prep_segments.py
imports: import argparse
  import math
  import os
  import sys
label_desc: Use image node_id 1 for calling a global function with example usage: pack_zero(file_id, number, length) and returns: unknown