code: def _get_filenames_dict(tokenized_path, recap_source: str):
      """Get dictionary of filenames for each split."""
      filenames_dict = {}
      for split in _SPLITS:
          tokenized_data = _load_jsonl(
              os.path.join(
                  tokenized_path,
                  "SummScreen",
                  _RECAP_SOURCE_FULL_NAMES[recap_source],
                  f"{recap_source}_{split}.json",
              )
          )
          filenames_dict[split] = [
              row["filename"] for row in tokenized_data
          ]
      return filenames_dict
  
file_path: datasets/tensorflow_datasets/datasets/summscreen/summscreen_dataset_builder.py
imports: import json
  import os
  import numpy
  from tensorflow_datasets.core.utils.lazy_imports_utils import tensorflow
  import tensorflow_datasets.public_api
label_desc: Use image node_id 4 for calling a global function with example usage: _get_filenames_dict(tokenized_path, recap_source) and returns: filenames_dict