code: def __init__(self, dataset, eval=False, **kwargs):
      if kwargs.get("collate_fn", None) is None:
          kwargs["collate_fn"] = self._collate_fn
      self.eval = eval
      super().__init__(dataset, **kwargs)
  
imports: from abc import ABC
  import csv
  from collections import OrderedDict
  import numpy
  import torch
  from torch.utils.data import DataLoader
  from torch.utils.data import Dataset, BatchSampler
  from megatron import print_rank_0, get_args, get_tokenizer
  from megatron.data.biencoder_dataset_utils import make_attention_mask
label_desc: Use image node_id 1 to create a new CustomDataLoader object from inherited base classes: DataLoader with example: obj = CustomDataLoader(dataset, eval)