code: def _get_shard_file(self, shard_index):
      file_index = self._get_shard_file_index(
          shard_index, self.global_rank
      )
      return self.dataset_files[file_index]
  
imports: import os
  import random
  import time
  from concurrent.futures import ProcessPoolExecutor
  import h5py
  import numpy
  import torch
  import torch.distributed
  from bert_dataset_provider import BertDatasetProviderInterface
  from torch.utils.data import DataLoader, Dataset
  from torch.utils.data.distributed import DistributedSampler
label_desc: Use image node_id 7 for calling the NvidiaBertDatasetProvider obj's underlying member method code with example usage: obj._get_shard_file(shard_index) and returns: self