differential-privacy/lib/laplace.js

Implements Global Differential Privacy for almost any numeric function

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.laplaceProbDistribution = void 0;
var decimal_js_1 = require("decimal.js");
var ONE = new decimal_js_1.Decimal(1);
var TWO = new decimal_js_1.Decimal(2);
function laplaceProbDistribution(sensitivity, epsilon) {
    var scale = sensitivity.dividedBy(epsilon);
    var symmetricRandom = decimal_js_1.Decimal.random().minus(0.5);
    var sign = symmetricRandom.greaterThan(0) ? 1 : -1;
    return scale.times(sign)
        .times(decimal_js_1.Decimal.log(ONE.minus(TWO.times(decimal_js_1.Decimal.abs(symmetricRandom)))));
}
exports.laplaceProbDistribution = laplaceProbDistribution;
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