from icrawler.builtin import BingImageCrawler

classes = ["trees", "roads", "Human faces"]
number = 100

for c in classes:
    # see n is represent negaive images
    bing_crawler = BingImageCrawler(storage={"root_dir": f'n/{c.replace(" ","_")}'})
    bing_crawler.crawl(keyword=c, filters=None, max_num=number, offset=0)