The `make_data.py` file in `scripts` invokes `create_data_files(args.data_directory)` where default directory as setup is `data`. The function invokes ``` ArithmeticTokenizer.create_token_file(data_dir) ArithmeticDataset.create_dataset_files(data_dir) ``` both of which are not defined in the corresponding class. This breaks the code when running for multiple experiments.