2716ec90b5be79d67cb39c46f1182b9827fa60bc,scripts/datasets/market1501.py,,main,#,38

Before Change

    fpath = osp.join(root, name+".zip")
    exdir = osp.join(root, name)

    if os.path.exists(fpath):
        if not osp.isdir(exdir):
            extract(fpath, root)
            make_list(exdir)

After Change

    makedirs(root)
    fpath = osp.join(root, name + ".zip")
    exdir = osp.join(root, name)
    if not osp.exists(fpath) and not osp.isdir(exdir) and args.no_download:
        raise ValueError(("{} dataset archive not found, make sure it is present."
                          " Or you should not disable "--no-download" to grab it".format(fpath)))
    // Download by default
    if not args.no_download:
        print("Downloading dataset")
        download(url, fpath, overwrite=False)
        print("Dataset downloaded")

Instances