np.clip()的用法

一时间忘了，就又看了一下API。是这样说的

numpy. clip ( a,  a_min,  a_max,  out=None ) [source]

Clip (limit) the values in an array.

Given an interval, values outside the interval are clipped to the interval edges. For example, if an interval of [0, 1] is specified, values smaller than 0 become 0, and values larger than 1 become 1.

也就是说，截取的意思，超出的部分就把它强置为边界部分。