def cache_cfg_urls():
    """Download URLs in the config, cache them locally, and rewrite cfg to make
    use of the locally cached file.
    """
    __C.TRAIN.WEIGHTS = cache_url(__C.TRAIN.WEIGHTS, __C.DOWNLOAD_CACHE)
    __C.TEST.WEIGHTS = cache_url(__C.TEST.WEIGHTS, __C.DOWNLOAD_CACHE)
    __C.TRAIN.PROPOSAL_FILES = tuple(
        cache_url(f, __C.DOWNLOAD_CACHE) for f in __C.TRAIN.PROPOSAL_FILES
    )
    __C.TEST.PROPOSAL_FILES = tuple(
        cache_url(f, __C.DOWNLOAD_CACHE) for f in __C.TEST.PROPOSAL_FILES
    )
Download URLs in the config, cache them locally, and rewrite cfg to make
    use of the locally cached file.
    
detectron/core/config.py