@tensorflow-models/coco-ssd
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Object detection model (coco-ssd) in TensorFlow.js
77 lines • 3.04 kB
JavaScript
"use strict";
/**
* @license
* Copyright 2017 Google Inc. All Rights Reserved.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* =============================================================================
*/
Object.defineProperty(exports, "__esModule", { value: true });
var seedrandom = require("seedrandom");
// https://en.wikipedia.org/wiki/Marsaglia_polar_method
var MPRandGauss = /** @class */ (function () {
function MPRandGauss(mean, stdDeviation, dtype, truncated, seed) {
this.mean = mean;
this.stdDev = stdDeviation;
this.dtype = dtype;
this.nextVal = NaN;
this.truncated = truncated;
if (this.truncated) {
this.upper = this.mean + this.stdDev * 2;
this.lower = this.mean - this.stdDev * 2;
}
var seedValue = seed ? seed : Math.random();
this.random = seedrandom.alea(seedValue.toString());
}
/** Returns next sample from a gaussian distribution. */
MPRandGauss.prototype.nextValue = function () {
if (!isNaN(this.nextVal)) {
var value = this.nextVal;
this.nextVal = NaN;
return value;
}
var resultX, resultY;
var isValid = false;
while (!isValid) {
var v1 = void 0, v2 = void 0, s = void 0;
do {
v1 = 2 * this.random() - 1;
v2 = 2 * this.random() - 1;
s = v1 * v1 + v2 * v2;
} while (s >= 1 || s === 0);
var mul = Math.sqrt(-2.0 * Math.log(s) / s);
resultX = this.mean + this.stdDev * v1 * mul;
resultY = this.mean + this.stdDev * v2 * mul;
if (!this.truncated || this.isValidTruncated(resultX)) {
isValid = true;
}
}
if (!this.truncated || this.isValidTruncated(resultY)) {
this.nextVal = this.convertValue(resultY);
}
return this.convertValue(resultX);
};
/** Handles proper rounding for non floating point numbers. */
MPRandGauss.prototype.convertValue = function (value) {
if (this.dtype == null || this.dtype === 'float32') {
return value;
}
return Math.round(value);
};
/** Returns true if less than 2-standard-deviations from the mean. */
MPRandGauss.prototype.isValidTruncated = function (value) {
return value <= this.upper && value >= this.lower;
};
return MPRandGauss;
}());
exports.MPRandGauss = MPRandGauss;
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