###### ![Screen Shot 2016-08-08 at 11.53.41 AM](https://ujwlkarn.files.wordpress.com/2016/08/screen-shot-2016-08-08-at-11-53-41-am.png?w=748)Figure 2: different activation functions
**偏置的重要性**: 偏置的主要功能在于给每个节点提供一个常数值(作为节点常规输入值的补充)。 See [this link](http://stackoverflow.com/q/2480650/3297280) to learn more about the role of bias in a neuron.
9.[What does the hidden layer in a neural network compute?](http://stats.stackexchange.com/a/63163/53914)
10.[How to choose the number of hidden layers and nodes in a feedforward neural network? ](http://stats.stackexchange.com/a/1097/53914)
11.[Crash Introduction to Artificial Neural Networks](http://ulcar.uml.edu/~iag/CS/Intro-to-ANN.html)
12.[Why the BIAS is necessary in ANN? Should we have separate BIAS for each layer?](http://stackoverflow.com/questions/7175099/why-the-bias-is-necessary-in-ann-should-we-have-separate-bias-for-each-layer)
15. A. W. Harley, “An Interactive Node-Link Visualization of Convolutional Neural Networks,” in ISVC, pages 867-877, 2015 ([link](http://scs.ryerson.ca/~aharley/vis/harley_vis_isvc15.pdf))