/
swish.js
54 lines (48 loc) · 1 KB
/
swish.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
import Layer from './base.js'
/**
* Swish layer
*/
export default class SwishLayer extends Layer {
/**
* @param {object} config config
* @param {number} [config.beta] beta
*/
constructor({ beta = 1, ...rest }) {
super(rest)
this._beta = beta
}
calc(x) {
this._i = x
const o = x.copy()
o.map(v => v / (1 + Math.exp(-this._beta * v)))
return o
}
grad(bo) {
this._bo = bo
const bi = bo.copy()
bi.broadcastOperate(
this._i,
(a, b) =>
(a * (1 + (b * this._beta * Math.exp(-this._beta * b)) / (1 + Math.exp(-this._beta * b)))) /
(1 + Math.exp(-this._beta * b))
)
return bi
}
update(optimizer) {
let s = 0
for (let i = 0; i < this._i.length; i++) {
s +=
this._bo.value[i] *
((this._i.value[i] * Math.exp(-this._beta * this._i.value[i])) /
(1 + Math.exp(-this._beta * this._i.value[i])) ** 2)
}
this._beta -= optimizer.delta('beta', s / this._i.length)
}
toObject() {
return {
type: 'swish',
beta: this._beta,
}
}
}
SwishLayer.registLayer()