这个系列是我跟着斯坦福的coursera中的机器学习做的笔记，本打算做个翻译来着，等翻译了一大半后发现有很多地方翻译的不是很能准确的表示含义，一怒之下就给删了...有些东西看英文原版反而更容易懂，不是吗？

What is Machine Learning?

Two definitions of Machine Learning are offered. Arthur Samuel described it as: “the field of study that gives computers the ability to learn without being explicitly programmed.” This is an older, informal definition.

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