refactor: updated implementation according to code review

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Author: nakul-krishnakumar

lib/node_modules/@stdlib/ml/cluster/strided/dkmeansld/lib/closest_centroid.js

@@ -0,0 +1,62 @@
+/**
+* @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 //
+
+
+// MAIN //
+
+/**
+* Find closest centroid.
+* @private
+* @param {Function} dist - distance method.
+* @param {PositiveInteger} N - number of features.
+* @param {PositiveInteger} k - number of clusters.
+* @param {Float64Array} X - input strided matrix.
+* @param {integer} sx - stride length of X.
+* @param {integer} ox - starting index of X.
+* @param {Float64Array} c - strided array centroid locations.
+* @param {integer} sc1 - stride of the third dimension.
+* @param {integer} sc2 - stride of second dimension.
+* @param {integer} oc - initial index of centroids.
+* @returns {NonNegativeInteger} closest centroid.
+*/
+function closestCentroid( dist, N, k, X, sx, ox, c, sc1, sc2, oc ) {
+	var bestDist;
+	var best;
+	var d;
+	var i;
+
+	best = 0;
+	bestDist = dist( N, X, sx, ox, c, sc2, oc );
+
+	oc += sc1; // move to the next centroid
+	for ( i = 1; i < k; i++ ) {
+		d = dist( N, X, sx, ox, c, sc2, oc );
+		if ( d < bestDist ) {
+			bestDist = d;
+			best = i;
+		}
+		oc += sc1;
+	}
+	return best;
+}
+
+module.exports = closestCentroid;

lib/node_modules/@stdlib/ml/cluster/strided/dkmeansld/lib/compute_inertia.js

@@ -0,0 +1,64 @@
+/**
+* @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 drss = require( '@stdlib/blas/ext/base/drss' ).ndarray;
+
+
+// MAIN //
+
+/**
+* Compute inertia.
+* @private
+* @param {PositiveInteger} M - number of samples.
+* @param {PositiveInteger} N - number of features.
+* @param {Float64Array} X - input strided matrix.
+* @param {integer} strideX1 - stride length of first dimension of X.
+* @param {integer} strideX2 - stride length of second dimension of X.
+* @param {integer} offsetX - starting index of X.
+* @param {Float64Array} centroids - strided array centroid locations.
+* @param {integer} strideC1 - stride length of first dimension of c.
+* @param {integer} strideC2 - stride length of second dimension of c.
+* @param {integer} offsetC - initial index of centroids.
+* @param {Int32Array} labels - labels array.
+* @returns {number} inertia.
+*/
+function computeInertia( M, N, X, strideX1, strideX2, offsetX, centroids, strideC1, strideC2, offsetC, labels ) { // eslint-disable-line max-len, max-params
+	var inertia;
+	var ox;
+	var oc;
+	var d;
+	var c;
+	var i;
+
+	inertia = 0.0;
+	ox = offsetX;
+	for ( i = 0; i < M; i++ ) {
+		c = labels[ i ];
+		oc = offsetC + ( c * strideC1 );
+		d = drss( N, X, strideX2, ox, centroids, strideC2, oc );
+		inertia += d;
+		ox += strideX1;
+	}
+	return inertia;
+}
+
+module.exports = computeInertia;