load_data.py 文件源码

def maybe_download(filename, force=False):
    """Download a file if not present"""
    filename = os.path.join(root, filename)
    if force or not os.path.exists(filename):
        print('Attempting to download:', filename)
        filename, _ = urlretrieve(url + filename, filename)
        print('Download Complete!')
    return filename