code: def convert_dir(orig_dir, new_dir):
      file_list = os.listdir(orig_dir)
      # Only convert .prd files, skip the .raw files from VLSP 2009
      file_list = [
          os.path.join(orig_dir, f)
          for f in file_list
          if os.path.splitext(f)[1] != ".raw"
      ]
      convert_files(file_list, new_dir)
  
file_path: stanza/stanza/utils/datasets/constituency/vtb_convert.py
imports: import argparse
  import os
  from collections import defaultdict
  from stanza.models.constituency.tree_reader import read_trees, MixedTreeError, UnlabeledTreeError
label_desc: Use image node_id 6 for calling a global function with example usage: convert_dir(orig_dir, new_dir) without return types