time-to-botec/squiggle/node_modules/@stdlib/nlp/lda/lib/get_thetas.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 matrix = require( './matrix.js' );
// MAIN //
/**
* Get theta matrix. Its rows correspond to document distributions over topics.
*
* @private
* @returns {Matrix} theta parameter matrix
*/
function getThetas() {
/* eslint-disable no-invalid-this */
var Theta;
var val;
var d;
var k;
Theta = matrix( [ this.D, this.K ] );
for ( d = 0; d < this.D; d++ ) {
for ( k = 0; k < this.K; k++ ) {
val = ( this.nd.get( d, k ) + this.alpha ) /
( this.ndSum[ d ] + ( this.K*this.alpha ) );
Theta.set( d, k, val );
}
}
return Theta;
}
// EXPORTS //
module.exports = getThetas;