/
dropout.js
62 lines (55 loc) · 1.3 KB
/
dropout.js
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import Layer from './base.js'
/**
* Dropout layer
*/
export default class DropoutLayer extends Layer {
/**
* @param {object} config object
* @param {number} [config.drop_rate] Dropout rate
*/
constructor({ drop_rate = 0.5, ...rest }) {
super(rest)
this._drop_rate = drop_rate
}
bind({ drop_rate }) {
this._drop_rate = drop_rate || this._drop_rate
}
_shuffle(n) {
const arr = Array.from({ length: n }, (_, i) => i)
for (let i = n - 1; i > 0; i--) {
let r = Math.floor(Math.random() * (i + 1))
;[arr[i], arr[r]] = [arr[r], arr[i]]
}
return arr.slice(0, Math.max(1, Math.floor(n * this._drop_rate)))
}
calc(x) {
const step = x.length / x.sizes[0]
this._drop_index = this._shuffle(step)
const o = x.copy()
for (let i = 0; i < x.sizes[0]; i++) {
for (const j of this._drop_index) {
o.value[i * step + j] = 0
}
}
o.map(v => v * (step / (step - this._drop_index.length)))
return o
}
grad(bo) {
const bi = bo.copy()
const step = bi.length / bi.sizes[0]
for (let i = 0; i < bo.sizes[0]; i++) {
for (const j of this._drop_index) {
bi.value[i * step + j] = 0
}
}
bi.map(v => v * (step / (step - this._drop_index.length)))
return bi
}
toObject() {
return {
type: 'dropout',
drop_rate: this._drop_rate,
}
}
}
DropoutLayer.registLayer()