S函数

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Sigmoid function 2D plot
Sigmoid function complex plot

S函数得名因其形状像S字母。


S函数的级数展开为:

参考资料[编辑]

  • Mitchell, Tom M. Machine Learning. WCB–McGraw–Hill. 1997. ISBN 0-07-042807-7. . In particular see "Chapter 4: Artificial Neural Networks" (in particular pp. 96–97) where Mitchell uses the word "logistic function" and the "sigmoid function" synonymously – this function he also calls the "squashing function" – and the sigmoid (aka logistic) function is used to compress the outputs of the "neurons" in multi-layer neural nets.
  • Humphrys, Mark. Continuous output, the sigmoid function.  Properties of the sigmoid, including how it can shift along axes and how its domain may be transformed.



参见[编辑]