code: def convert_dir(org_dir, new_dir, suffix):
      os.makedirs(new_dir, exist_ok=True)
      file_list = os.listdir(org_dir)
      file_list = [
          os.path.join(org_dir, f)
          for f in file_list
          if os.path.splitext(f)[1] == suffix
      ]
      convert_files(file_list, new_dir)
  
imports: import argparse
  import os
label_desc: Use image node_id 4 for calling a global function with example usage: convert_dir(org_dir, new_dir, suffix) without return types