init.js (1697B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var randu = require( '@stdlib/random/base/randu' ); 24 var floor = require( '@stdlib/math/base/special/floor' ); 25 26 27 // MAIN // 28 29 /** 30 * Randomly assign topics to words and keep track of the counts. 31 * 32 * @private 33 */ 34 function init() { 35 /* eslint-disable no-invalid-this */ 36 var topic; 37 var newz; 38 var len; 39 var wt; 40 var d; 41 var i; 42 43 this.z = []; 44 for ( d = 0; d < this.D; d++ ) { 45 this.z.push( [] ); 46 len = this.w[ d ].length; 47 48 // Initialize random topics... 49 for ( i = 0; i < len; i++ ) { 50 newz = floor( randu() * this.K ); 51 this.z[ d ].push( newz ); 52 } 53 this.ndSum[ d ] = len; 54 for ( i = 0; i < len; i++ ) { 55 wt = this.w[ d ][ i ]; 56 topic = this.z[ d ][ i ]; 57 58 // Number of instances of word i assigned to topic j: 59 this.nw.set( wt, topic, this.nw.get( wt, topic ) + 1 ); 60 61 // Number of words in document i assigned to topic j: 62 this.nd.set( d, topic, this.nd.get( d, topic ) + 1 ); 63 64 // Total number of words assigned to topic j: 65 this.nwSum[ topic ] = this.nwSum[ topic ] + 1; 66 } 67 } 68 } 69 70 71 // EXPORTS // 72 73 module.exports = init;