Код гадалки Шеннона перенесен в проект

source/_assets/predictor/Daemon.js

@@ -0,0 +1,145 @@
+const DEFAULT_EPSILON = 0.01;
+
+/**
+ * @param {Number[]} steps
+ *
+ * @returns {String}
+ */
+function create_key(steps) {
+    return steps.join(':');
+}
+
+class Daemon {
+    /**
+     * @type {Number}
+     */
+    base;
+
+    /**
+     * @type {Number}
+     */
+    humanCount;
+
+    /**
+     * @type {Number}
+     */
+    robotCount;
+
+    /**
+     * @type {Number}
+     */
+    epsilon;
+
+    /**
+     * @type {Object}
+     */
+    weights = {};
+
+    /**
+     * @param {Number} base
+     * @param {Number} humanCount
+     * @param {Number} robotCount
+     * @param {Number} epsilon
+     */
+    constructor(base, humanCount, robotCount, epsilon = DEFAULT_EPSILON) {
+        this.base = base;
+        this.humanCount = humanCount;
+        this.robotCount = robotCount;
+        this.epsilon = epsilon;
+    }
+
+    /**
+     * @returns {Number}
+     */
+    get power() {
+        return this.humanCount + this.robotCount;
+    }
+
+    /**
+     * @param {Journal} journal
+     *
+     * @returns {Number}
+     */
+    predict(journal) {
+        const steps = this._getStepSlice(journal);
+
+        const proposals = [];
+        for (let i = 0; i < this.base; ++i) {
+            proposals[i] = this._getWeight([...steps, i]);
+        }
+
+        const maxWeight = Math.max(...proposals);
+
+        return proposals.indexOf(maxWeight);
+    }
+
+    /**
+     * @param {Journal} journal
+     * @param {Number} humanValue
+     */
+    adjust(journal, humanValue) {
+        const steps = this._getStepSlice(journal);
+        const adjustmentWeight = this._getAdjustmentWeight(journal.length);
+        this._adjustWeight([...steps, humanValue], adjustmentWeight);
+    }
+
+    /**
+     * @param {Journal} journal
+     *
+     * @returns {Number[]}
+     */
+    _getStepSlice(journal) {
+        return journal.getLastMovements(this.humanCount, this.robotCount);
+    }
+
+    /**
+     * @param {Number} stepNumber
+     *
+     * @returns {Number}
+     *
+     * @private
+     */
+    _getAdjustmentWeight(stepNumber) {
+        return Math.pow(1 + this.epsilon, stepNumber);
+    }
+
+    /**
+     * @param {Number[]} steps
+     *
+     * @returns {Number}
+     *
+     * @private
+     */
+    _getWeight(steps) {
+        const key = create_key(steps);
+        const weight = this.weights[key];
+        return weight === undefined ? 0 : weight;
+    }
+
+    /**
+     * @param {Number[]} steps
+     * @param {Number} value
+     *
+     * @returns {Number}
+     *
+     * @private
+     */
+    _setWeight(steps, value) {
+        const key = create_key(steps);
+        this.weights[key] = value;
+    }
+
+    /**
+     * @param {Number[]} steps
+     * @param {Number} weight
+     *
+     * @private
+     */
+    _adjustWeight(steps, weight) {
+        const currentWeight = this._getWeight(steps);
+        const newWeight = currentWeight + weight;
+        this._setWeight(steps, newWeight);
+    }
+}
+
+export default Daemon;