code: def test_jittor_get_backend(self):
      collate_bacth = Collator(backend="auto")
      dl = MyDataset()
      dl = dl.set_attrs(collate_batch=collate_bacth, batch_size=256)
      for batch in dl:
          print(batch)
  
file_path: fastNLP/tests/core/dataloaders/jittor_dataloader/test_fdl.py
imports: import pytest
  import numpy
  from fastNLP.envs import _module_available
  from fastNLP.core.dataloaders.jittor_dataloader import JittorDataLoader, prepare_jittor_dataloader
  from fastNLP.core.dataset import DataSet
  from fastNLP.core.collators import Collator
  from fastNLP.io.data_bundle import DataBundle
  from fastNLP.envs.imports import _NEED_IMPORT_JITTOR
label_desc: Use image node_id 6 for calling the TestJittor obj's underlying member method code with example usage: obj.test_jittor_get_backend() without return types