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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。
