code: def get_base_db_workdir():
      """Sub-directory for DB data."""
      args = get_retro_args()
      return os.path.join(args.retro_workdir, "db")
  
imports: from collections import defaultdict
  import glob
  import json
  import numpy
  import os
  from tqdm import tqdm
  from megatron import get_retro_args, print_rank_0
  from megatron.core.datasets.indexed_dataset import MMapIndexedDataset
  from tools.retro.external_libs import h5py
  from .dataset import DBDataset
label_desc: Use image node_id 1 for calling a global function with example usage: get_base_db_workdir() and returns: os