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Sleeping
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const {pick} = require("lodash");
const Config = require("./config.js");
class Node {
constructor (s_note, c_note) {
this.s_note = s_note;
this.c_note = c_note;
console.assert(this.s_note.softIndex != null, "s_note softIndex is null");
this.offset = this.s_note.softIndex - this.c_note.softIndex;
this._prev = null;
this._totalCost = 0;
this._value = 0;
this.cacheDirty = true;
//this.evaluatePrev(Node.Zero);
}
get prev () {
return this._prev;
}
set prev (value) {
if (value != this._prev) {
this._prev = value;
this.cacheDirty = true;
}
}
get si () {
return this.s_note.index;
}
get ci () {
return this.c_note.index;
}
get root () {
return this.prev.root || this;
}
get rootSi () {
return !this.prev.zero ? this.prev.rootSi : this.si;
}
get id () {
return `${this.s_note.index},${this.c_note.index}`;
}
static cost (prev, skip, self) {
return prev * Config.CostStepAttenuation + Math.tanh(skip * Config.SkipCost) + Math.tanh(self * 0.5);
}
updateCache () {
if (this.cacheDirty) {
this._totalCost = Node.cost(this.prev.totalCost, this.si - this.prev.si - 1, this.selfCost);
this._value = this.prev.value + 1 - Math.tanh(this.selfCost * 0.5);
this.cacheDirty = false;
}
}
get totalCost () {
this.updateCache();
return this._totalCost;
}
get value () {
this.updateCache();
return this._value;
}
get deep () {
return this.prev.deep + 1;
}
get path () {
const path = [];
for (let node = this; !node.zero; node = node.prev) {
path[node.si] = node.ci;
}
for (let i = 0; i < path.length; ++i)
if (typeof path[i] != "number")
path[i] = -1;
return path;
}
dump () {
return pick(this, ["id", "si", "ci", "rootSi", "value", "deep", "rootSi", "offset", "prior", "selfCost", "totalCost"]);
}
evaluatePrev (node) {
const cost = this.evaluatePrevCost(node);
console.assert(this.si - node.si >= 1, "node index error:", this, node/*, {get [Symbol.toStringTag]() {debugger}}*/);
//if (this.si - node.si < 1)
// debugger;
const totalCost = Node.cost(node.totalCost, this.si - node.si - 1, cost);
if (!this.prev || totalCost < this.totalCost) {
this.prev = node;
this.selfCost = cost;
return true;
}
return false;
}
evaluatePrevCost (node) {
let cost = 0;
if (node.offset != null) {
const bias = this.offset - node.offset;
const costCoeff = node.zero ? Config.ZeroOffsetCost : (bias > 0 ? Config.LagOffsetCost : Config.LeadOffsetCost);
cost += (bias * costCoeff) ** 2;
}
return cost;
}
priorByOffset (offset) {
const distance = Math.abs(this.offset - offset) / 1;//(this.s_note.deltaSi + 0.04);
return Math.tanh(this.value * Config.PriorValueSigmoidFactor) - Math.tanh(distance * Config.PriorDistanceSigmoidFactor);
//return Math.log(this.value) * Math.tanh(4 / distance);
//return this.value - distance;
}
static zero () {
return {
zero: true,
totalCost: 0,
value: 0,
si: -1,
ci: -1,
deep: 0,
offset: 0,
};
}
};
module.exports = Node;
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