def __init__(self, file: str):
        """
        :param file: - real file name or the resource name as they are defined in download_data.py
        """
        self.file = file
        self.data_files = []

        :param file: - real file name or the resource name as they are defined in download_data.py
        
se2/DPR/dpr/data/retriever_data.py