time-to-botec/squiggle/node_modules/@stdlib/nlp/lda/lib/init.js

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/**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* 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.
*/
'use strict';
// MODULES //
var randu = require( '@stdlib/random/base/randu' );
var floor = require( '@stdlib/math/base/special/floor' );
// MAIN //
/**
* Randomly assign topics to words and keep track of the counts.
*
* @private
*/
function init() {
/* eslint-disable no-invalid-this */
var topic;
var newz;
var len;
var wt;
var d;
var i;
this.z = [];
for ( d = 0; d < this.D; d++ ) {
this.z.push( [] );
len = this.w[ d ].length;
// Initialize random topics...
for ( i = 0; i < len; i++ ) {
newz = floor( randu() * this.K );
this.z[ d ].push( newz );
}
this.ndSum[ d ] = len;
for ( i = 0; i < len; i++ ) {
wt = this.w[ d ][ i ];
topic = this.z[ d ][ i ];
// Number of instances of word i assigned to topic j:
this.nw.set( wt, topic, this.nw.get( wt, topic ) + 1 );
// Number of words in document i assigned to topic j:
this.nd.set( d, topic, this.nd.get( d, topic ) + 1 );
// Total number of words assigned to topic j:
this.nwSum[ topic ] = this.nwSum[ topic ] + 1;
}
}
}
// EXPORTS //
module.exports = init;