code: def execute(self):
      if self.args.mode == "convert":
          self.convert()
      elif self.args.mode == "extract":
          self.extract()
      else:
          raise ValueError(
              "mode must be either `convert` or `extract` "
          )
  
file_path: mmf/tools/scripts/features/lmdb_conversion.py
imports: import argparse
  import glob
  import os
  import pickle
  import lmdb
  import numpy
  import tqdm
  from mmf.utils.file_io import PathManager
label_desc: Use image node_id 5 for calling the LMDBConversion obj's underlying member method code with example usage: obj.execute() without return types