相关系数的可能误差不是一个固定的量，而是取决于样本的大小。

Read, read, read. Read everything — trash, classics, good and bad, and see how they do it. Just like a carpenter who works as an apprentice and studies the master. Read! You'll absorb it. Then write. If it's good, you'll find out. If it's not, throw it out of the window.

算法研究既关乎逻辑和数学，也关乎创造力。

释义：不能因为一时的称赞，就认为某人是君子；也不能因为一时的诽谤，就认为某人是小人。

The world is a tragedy to those who feel, but a comedy to those who think.

满足于少，总比贪得无厌更幸福。