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* @license Apache-2.0
*
* Copyright (c) 2026 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 isLayout = require( '@stdlib/blas/base/assert/is-layout' );
var isRowMajor = require( '@stdlib/ndarray/base/assert/is-row-major-string' );
var isColumnMajor = require( '@stdlib/ndarray/base/assert/is-column-major-string' );
var resolveMetricStr = require( '@stdlib/ml/base/kmeans/metric-resolve-str' );
var stride2offset = require( '@stdlib/strided/base/stride2offset' );
var max = require( '@stdlib/math/base/special/fast/max' );
var format = require( '@stdlib/string/format' );
var ndarray = require( './ndarray.js' );
// MAIN //
/**
* Assigns each data point in a double-precision floating-point input matrix to its closest centroid.
*
* @param {string} order - storage layout
* @param {NonNegativeInteger} M - number of data points
* @param {NonNegativeInteger} N - number of features
* @param {NonNegativeInteger} k - number of centroids
* @param {string} metric - distance metric
* @param {Float64Array} X - input data matrix
* @param {integer} LDX - stride of the first dimension of `X` (a.k.a., leading dimension of the matrix `X`)
* @param {Float64Array} C - centroid matrix
* @param {integer} LDC - stride of the first dimension of `C` (a.k.a., leading dimension of the matrix `C`)
* @param {Int32Array} out - output array for closest centroid indices
* @param {integer} so - stride length for `out`
* @param {Int32Array} counts - output array for per-centroid assignment counts
* @param {integer} sco - stride length for `counts`
* @throws {TypeError} first argument must be a valid order
* @throws {TypeError} fifth argument must be a supported distance metric
* @throws {RangeError} seventh argument must be greater than or equal to max(1,N) (row-major) or max(1,M) (column-major)
* @throws {RangeError} ninth argument must be greater than or equal to max(1,N) (row-major) or max(1,k) (column-major)
* @returns {Int32Array} output array
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
* var Int32Array = require( '@stdlib/array/int32' );
*
* var X = new Float64Array( [ 1.0, 1.0, 5.0, 5.0, 1.5, 1.5 ] );
* var C = new Float64Array( [ 1.0, 1.0, 5.0, 5.0 ] );
*
* var out = new Int32Array( 3 );
* var counts = new Int32Array( 2 );
*
* dclosestCentroids( 'row-major', 3, 2, 2, 'sqeuclidean', X, 2, C, 2, out, 1, counts, 1 );
* // out => <Int32Array>[ 0, 1, 0 ]
*/
function dclosestCentroids( order, M, N, k, metric, X, LDX, C, LDC, out, so, counts, sco ) { // eslint-disable-line max-len, max-params
var sx1;
var sx2;
var sc1;
var sc2;
var sx;
var sc;
if ( !isLayout( order ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a valid order. Value: `%s`.', order ) );
}
if ( isRowMajor( order ) ) {
sx = N;
sc = N;
} else {
sx = M;
sc = k;
}
if ( resolveMetricStr( metric ) === null ) {
throw new TypeError( format( 'invalid argument. Fifth argument must be a supported distance metric. Value: `%s`.', metric ) );
}
if ( LDX < max( 1, sx ) ) {
throw new RangeError( format( 'invalid argument. Seventh argument must be greater than or equal to max(1,%d). Value: `%d`.', sx, LDX ) );
}
if ( LDC < max( 1, sc ) ) {
throw new RangeError( format( 'invalid argument. Ninth argument must be greater than or equal to max(1,%d). Value: `%d`.', sc, LDC ) );
}
if ( k < 1 || M < 1 || N < 1 ) {
return out;
}
if ( isColumnMajor( order ) ) {
sx1 = 1;
sx2 = LDX;
sc1 = 1;
sc2 = LDC;
} else { // order === 'row-major'
sx1 = LDX;
sx2 = 1;
sc1 = LDC;
sc2 = 1;
}
return ndarray( M, N, k, metric, X, sx1, sx2, 0, C, sc1, sc2, 0, out, so, stride2offset( M, so ), counts, sco, stride2offset( k, sco ) ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = dclosestCentroids;
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