请问，数据集中“constraint”键的值是用什么工具提取的？

[boolmriver]

{"src": "Could you please try to make a purchase on the computer on the website.", "tgt": "请您试着使用电脑从网站购买。", "constraint": ["电脑从", "试着使用", "请您"], "hypo": "请您在电脑上尝试从网站上进行购买。"}