code: def _get_dataloader_train(self):
      return self._get_dataloader()
  
imports: import functools
  from unittest.mock import MagicMock
  import torch
  from mmf.common.registry import registry
  from mmf.common.sample import SampleList
  from mmf.datasets.lightning_multi_datamodule import LightningMultiDataModule
  from mmf.datasets.mmf_dataset_builder import MMFDatasetBuilder
  from mmf.datasets.multi_datamodule import MultiDataModule
  from mmf.trainers.mmf_trainer import MMFTrainer
  from omegaconf import OmegaConf
  from tests.test_utils import NumbersDataset
label_desc: Use image node_id 2 for calling the MultiDataModuleNumbersTestObject obj's underlying member method code with example usage: obj._get_dataloader_train() and returns: self