code: def latest_checkpoint(checkpoint_dir: str) -> str:
      return get_latest_checkpoint(checkpoint_dir)
  
file_path: BigDL/python/orca/src/bigdl/orca/learn/tf2/estimator.py
imports: import logging
  import numpy
  from bigdl.orca.learn.utils import get_latest_checkpoint
  from bigdl.dllib.utils.log4Error import invalidInputError
  from typing import TYPE_CHECKING, Dict, Union, Callable, Optional, Any
label_desc: Use image node_id 2 for calling the Estimator obj's underlying member method code with example usage: obj.latest_checkpoint(checkpoint_dir) and returns: get_latest_checkpoint