def densenet121(num_classes=1000, pretrained='imagenet'):
    r"""Densenet-121 model from
    `"Densely Connected Convolutional Networks" <https://arxiv.org/pdf/1608.06993.pdf>`
    """
    model = models.densenet121(pretrained=False)
    if pretrained is not None:
        settings = pretrained_settings['densenet121'][pretrained]
        model = load_pretrained(model, num_classes, settings)
    model = modify_densenets(model)
    return model