| 1 | // http://cs.stanford.edu/people/karpathy/convnetjs/
|
| 2 | // https://github.com/junku901/dnn
|
| 3 | var NN = {};
|
| 4 |
|
| 5 | NN.sigmoid = function(x) {
|
| 6 | var sigmoid = (1. / (1 + Math.exp(-x)))
|
| 7 | if(sigmoid ==1) {
|
| 8 | // console.warn("Something Wrong!! Sigmoid Function returns 1. Probably javascript float precision problem?\nSlightly Controlled value to 1 - 1e-14")
|
| 9 | sigmoid = 0.99999999999999; // Javascript Float Precision Problem.. This is a limit of javascript.
|
| 10 | } else if(sigmoid ==0) {
|
| 11 | // console.warn("Something Wrong!! Sigmoid Function returns 0. Probably javascript float precision problem?\nSlightly Controlled value to 1e-14")
|
| 12 | sigmoid = 1e-14;
|
| 13 | }
|
| 14 | return sigmoid; // sigmoid cannot be 0 or 1;;
|
| 15 | }
|
| 16 |
|
| 17 | NN.dSigmoid = function(x){
|
| 18 | a = B.sigmoid(x);
|
| 19 | return a * (1. - a);
|
| 20 | }
|
| 21 |
|
| 22 | module.exports = NN; |
| \ | No newline at end of file |