code: def _validate_folder(self, dir, pipeline_parallel):
      basic_folder_validation(dir)
  
      file_list = get_files(dir)
      file_prefix_list = [MODEL_FILE_PREFIX]
      if pipeline_parallel:
          file_prefix_list.extend(
              [LAYER_FILE_PREFIX, f"{LAYER_FILE_PREFIX}01"]
          )
      for file_prefix in file_prefix_list:
          ckpt_files = get_files_with_prefix(file_list, file_prefix)
          assert (
              len(ckpt_files) > 0
          ), f"{dir} seems a bogus DeepSpeed checkpoint folder: Cannot find {file_prefix}* files in there."
  
imports: import os
  from typing import Dict
  import torch
  from .reshape_3d_utils import model_3d_desc
  from .reshape_utils import basic_folder_validation, merge_state, partition_data, get_files, get_files_with_prefix
  from .constants import MODEL_FILE_PREFIX, LAYER_FILE_PREFIX
  from .reshape_meg_2d import reshape_meg_2d_parallel, meg_2d_parallel_map
  from .zero_checkpoint import ZeROCheckpoint
  from .constants import *
label_desc: Use image node_id 35 for calling the DeepSpeedCheckpoint obj's underlying member method code with example usage: obj._validate_folder(dir, pipeline_parallel) without return types