Today you can get an iPod nano for $179 that’s a fraction of the original iPod’s size and weight, with double the storage, a color display, video playback, and a built-in video camera.
The perceptron training rule is based on the idea that weight modification is best determined by some fraction of the difference between target and output.
感知器培训规则是基于这样一种思路—权系数的调整是由目标和输出的差分方程表达式决定。
3
There are many, but one plausible rule is based on the idea that weight and threshold modification should be determined by a fraction of (t - y).