def METHOD_NAME(self, rel_name, rel_url):
    '''
        Args:
            rel_name: relative path to where downloaded nnp is saved.
            rel_url: relative url path to where nnp is downloaded from.
        '''
    from nnabla.utils.download import download
    path_nnp = os.path.join(
            get_model_home(), 'semantic_segmentation/{}'.format(rel_name))
    url = os.path.join(get_model_url_base(),
                       'semantic_segmentation/{}'.format(rel_url))
    logger.info('Downloading {} from {}'.format(rel_name, url))
    dir_nnp = os.path.dirname(path_nnp)
    if not os.path.isdir(dir_nnp):
        os.makedirs(dir_nnp)
    download(url, path_nnp, open_file=False, allow_overwrite=False)
    print('Loading {}.'.format(path_nnp))
    self.nnp = NnpLoader(path_nnp)