计算学习理论中的一个关键见解是，学习问题的复杂性由假设空间的复杂性和可用数据的数量决定。

I'm a dreamer, but I'm also a doer.

The only purpose for which power can be rightfully exercised over any member of a civilized community， against his will， is to prevent harm to others.

未来不是沉重的，而是轻盈的。

根本不稳固必然会央及枝叶。行为不守信必然会损害声誉。