code: def get_file_len(fname_paths):
      len_res = []
      for fname in fname_paths:
          p = subprocess.Popen(
              ["wc", "-l", fname],
              stdout=subprocess.PIPE,
              stderr=subprocess.PIPE,
          )
          result, err = p.communicate()
          if p.returncode != 0:
              raise IOError(err)
          len_res.append(int(result.strip().split()[0]))
  
      return sum(len_res)
  
file_path: delta/delta/data/utils/common_utils.py
imports: import re
  import json
  import numpy
  from absl import logging
  import delta.compat
  import subprocess
  from delta import utils
label_desc: Use image node_id 9 for calling a global function with example usage: get_file_len(fname_paths) and returns: sum