74 lines
1.7 KiB
JavaScript
74 lines
1.7 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var randu = require( '@stdlib/random/base/randu' );
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var floor = require( '@stdlib/math/base/special/floor' );
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// MAIN //
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/**
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* Randomly assign topics to words and keep track of the counts.
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*
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* @private
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*/
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function init() {
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/* eslint-disable no-invalid-this */
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var topic;
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var newz;
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var len;
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var wt;
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var d;
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var i;
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this.z = [];
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for ( d = 0; d < this.D; d++ ) {
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this.z.push( [] );
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len = this.w[ d ].length;
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// Initialize random topics...
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for ( i = 0; i < len; i++ ) {
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newz = floor( randu() * this.K );
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this.z[ d ].push( newz );
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}
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this.ndSum[ d ] = len;
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for ( i = 0; i < len; i++ ) {
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wt = this.w[ d ][ i ];
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topic = this.z[ d ][ i ];
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// Number of instances of word i assigned to topic j:
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this.nw.set( wt, topic, this.nw.get( wt, topic ) + 1 );
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// Number of words in document i assigned to topic j:
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this.nd.set( d, topic, this.nd.get( d, topic ) + 1 );
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// Total number of words assigned to topic j:
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this.nwSum[ topic ] = this.nwSum[ topic ] + 1;
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}
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}
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}
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// EXPORTS //
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module.exports = init;
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