code: def dataset(self, split):
      if split not in self.datasets:
          raise KeyError("Dataset not loaded: " + split)
      return self.datasets[split]
  
file_path: fairseq/examples/laser/laser_src/laser_task.py
imports: from collections import OrderedDict, defaultdict
  import json
  import os
  import logging
  from argparse import ArgumentError
  from fairseq import options, models
  from fairseq.data import data_utils, Dictionary, LanguagePairDataset, IndexedDataset, FairseqDataset
  from .multitask_data_utils import MultitaskDatasetWrapper, MultidatasetEpochBatchIterator
  from fairseq.tasks import LegacyFairseqTask, register_task
label_desc: Use image node_id 5 for calling the LaserTask obj's underlying member method code with example usage: obj.dataset(split) and returns: self