... fixed-point system 定点系统 fixed-point value 定点值 fixed-program computer 固定程序计算机 ...
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断言表示为一些布尔表达式，程序员相信在程序中的某个特定点该表达式的值为真。
Assertions represent Boolean expressions that the programmer believes to be true at specific points in the program.
给定一个函数，你想要的其实是能够快速地知道，它在给定点的值？
And, what you would want to do with the function, really, is be able to tell quickly what's the value at a given point?
所以，▽w的方向,是在给定点令w的值增加得最快的方向。
So, the direction of gradient w is the direction of fastest increase of w at the given point.
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