get_phis.js (1216B)
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 matrix = require( './matrix.js' ); 24 25 26 // MAIN // 27 28 /** 29 * Get the phi matrix. Each row is a topic distribution over words. 30 * 31 * @private 32 * @returns {Matrix} phi parameter matrix 33 */ 34 function getPhis() { 35 /* eslint-disable no-invalid-this */ 36 var Phi; 37 var val; 38 var k; 39 var w; 40 41 Phi = matrix( [ this.K, this.W ] ); 42 for ( k = 0; k < this.K; k++ ) { 43 for ( w = 0; w < this.W; w++ ) { 44 val = ( this.nw.get( w, k ) + this.beta ) / 45 ( this.nwSum[ k ] + ( this.W*this.beta ) ); 46 Phi.set( k, w, val ); 47 } 48 } 49 return Phi; 50 } 51 52 53 // EXPORTS // 54 55 module.exports = getPhis;