code: def _get_files(self, instruction):
      split_infos = [
          splits.SplitInfo(
              name="train",
              shard_lengths=[3, 2, 3, 2, 3],  # 13 examples.
              num_bytes=0,
              filename_template=_filename_template(
                  dataset_name="mnist", split="train"
              ),
          )
      ]
      splits_dict = splits.SplitDict(split_infos=split_infos)
      return splits_dict[instruction].file_instructions
  
imports: from tensorflow_datasets import testing
  from tensorflow_datasets.core import naming
  from tensorflow_datasets.core import proto
  from tensorflow_datasets.core import splits
  from tensorflow_datasets.core.utils import shard_utils
  import tensorflow_datasets.public_api
label_desc: Use image node_id 1 for calling the GetDatasetFilesTest obj's underlying member method code with example usage: obj._get_files(instruction) and returns: splits_dict