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机器学习按照是否有真实标签的情况,分为有监督和无监督学习。
ground truth就是真实标签的意思,即由人工进行标注的数据,机器要去学习数据的特征就要有一个标准答案,让其一步一步的逼近真实答案,学习到真实答案的特征,相当于一个小孩子牙牙学习,有个成年人在旁边告诉孩子,你说的对与不对,然后自己反向传播总结经验,慢慢学习接近ground truth的特征。