/
preu.js
60 lines (54 loc) · 1.38 KB
/
preu.js
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import Layer from './base.js'
/**
* Parametric rectified exponential unit layer
*/
export default class ParametricRectifiedExponentialUnitLayer extends Layer {
/**
* @param {object} config config
* @param {number} [config.alpha] alpha
* @param {number} [config.beta] beta
*/
constructor({ alpha = 1, beta = 1, ...rest }) {
super(rest)
this._alpha = alpha
this._beta = beta
}
calc(x) {
this._i = x
const o = x.copy()
o.map(v => this._alpha * v * (v > 0 ? 1 : Math.exp(this._beta * v)))
return o
}
grad(bo) {
this._bo = bo
const bi = bo.copy()
bi.broadcastOperate(
this._i,
(a, b) => a * this._alpha * (b > 0 ? 1 : (1 + b * this._beta) * Math.exp(this._beta * b))
)
return bi
}
update(optimizer) {
let sa = 0
let sb = 0
for (let i = 0; i < this._i.length; i++) {
if (this._i.value[i] > 0) {
sa += this._bo.value[i] * this._i.value[i]
} else {
sa += this._bo.value[i] * (this._i.value[i] * Math.exp(this._beta * this._i.value[i]))
sb +=
this._bo.value[i] * (this._alpha * this._i.value[i] ** 2 * Math.exp(this._beta * this._i.value[i]))
}
}
this._alpha -= optimizer.delta('alpha', sa / this._i.length)
this._beta -= optimizer.delta('beta', sb / this._i.length)
}
toObject() {
return {
type: 'preu',
alpha: this._alpha,
beta: this._beta,
}
}
}
ParametricRectifiedExponentialUnitLayer.registLayer('preu')