fix: add early return for invalid args

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---

Author: nakul-krishnakumar

lib/node_modules/@stdlib/ml/strided/dkmeans-init-plus-plus/lib/dkmeans_init_plus_plus.js

@@ -31,7 +31,7 @@ var ndarray = require( './ndarray.js' );
 // MAIN //
 
 /**
-* Initializes centroids by performing the k-means++ initialization procedure.
+* Initializes centroids by performing the k-means++ initialization procedure on double-precision floating-point data points.
 *
 * ## Method
 *

lib/node_modules/@stdlib/ml/strided/dkmeans-init-plus-plus/lib/index.js

@@ -19,7 +19,7 @@
 'use strict';
 
 /**
-* Initialize centroids by performing the k-means++ initialization procedure using alternative indexing semantics.
+* Initialize centroids by performing the k-means++ initialization procedure on double-precision floating-point data points using alternative indexing semantics.
 *
 * @module @stdlib/ml/strided/dkmeans-init-plus-plus
 *

lib/node_modules/@stdlib/ml/strided/dkmeans-init-plus-plus/lib/ndarray.js

@@ -35,7 +35,7 @@ var dcorrelation = require( '@stdlib/stats/strided/distances/dcorrelation' ).nda
 // MAIN //
 
 /**
-* Initializes centroids by performing the k-means++ initialization procedure using alternative indexing semantics.
+* Initializes centroids by performing the k-means++ initialization procedure on double-precision floating-point data points using alternative indexing semantics.
 *
 * ## Method
 *
@@ -135,6 +135,9 @@ function dkmeansInitPlusPlus( k, M, N, out, so1, so2, oo, X, sx1, sx2, ox, metri
 	if ( trials < 1 ) {
 		throw new TypeError( format( 'invalid argument. Thirteenth argument must be a valid trials (>=1). Value: `%s`.', trials ) );
 	}
+	if ( k < 1 || M < 1 || N < 1) {
+		return NaN;
+	}
 
 	// Create seeded PRNGs:
 	rand = randu({