学习问题的复杂性通常由假设空间的大小和结构决定。

We must remember that in nature there are neither rewards nor punishments—there are consequences.

The beauty of mathematics lies in its ability to simplify the complex.

People, even more than things, have to be restored, revived, reclaimed and redeemed; never throw out anyone.

The universe we observe has precisely the properties we should expect if there is, at bottom, no design, no purpose, no evil, no good, nothing but blind, pitiless indifference.