code: def test_build_dataloader_train(self):
      kwargs = self._get_kwargs()
      dl = build_detection_train_loader(**kwargs)
      next(iter(dl))
  
imports: import os
  import pickle
  import sys
  import unittest
  from functools import partial
  import torch
  from iopath.common.file_io import LazyPath
  from detectron2 import model_zoo
  from detectron2.config import get_cfg, instantiate
  from detectron2.data import DatasetCatalog, DatasetFromList, MapDataset, ToIterableDataset, build_batch_data_loader, build_detection_test_loader, build_detection_train_loader
  from detectron2.data.common import AspectRatioGroupedDataset, set_default_dataset_from_list_serialize_method
  from detectron2.data.samplers import InferenceSampler, TrainingSampler
label_desc: Use image node_id 2 for calling the TestDataLoader obj's underlying member method code with example usage: obj.test_build_dataloader_train() without return types