code: def get_train_eval_files(input_dir):
    
    data_dir = _get_latest_data_dir(input_dir)
    train_pattern = os.path.join(data_dir, 'train*.tfrecord.gz')
    eval_pattern = os.path.join(data_dir, 'eval*.tfrecord.gz')
    train_files = file_io.get_matching_files(train_pattern)
    eval_files = file_io.get_matching_files(eval_pattern)
    return train_files, eval_files
docs: Get preprocessed training and eval files.