feat: add 5d kernels

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Author: headlessNode

lib/node_modules/@stdlib/ndarray/base/unary-reduce-subarray-by/lib/5d.js

@@ -0,0 +1,220 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2025 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 zeroTo = require( '@stdlib/array/base/zero-to' );
+var reverse = require( '@stdlib/array/base/reverse' );
+var take = require( '@stdlib/array/base/take-indexed' );
+var incrementOffsets = require( './increment_offsets.js' );
+var setViewOffsets = require( './set_view_offsets.js' );
+var offsets = require( './offsets.js' );
+var wrap = require( './wrap_strided_callback.js' );
+
+
+// MAIN //
+
+/**
+* Performs a reduction over an input ndarray according to a callback function and assigns results to a provided output ndarray.
+*
+* @private
+* @param {Function} fcn - reduction function
+* @param {Array<Object>} arrays - ndarrays
+* @param {Array<Object>} views - initialized ndarray-like objects representing sub-array views
+* @param {IntegerArray} strides - loop dimension strides for the input ndarray
+* @param {IntegerArray} d - list of dimensions over which to perform a reduction
+* @param {boolean} isRowMajor - boolean indicating if provided arrays are in row-major order
+* @param {Options} opts - function options
+* @param {Function} clbk - callback function
+* @param {thisArg} [thisArg] - callback execution context
+* @returns {void}
+*
+* @example
+* var Float64Array = require( '@stdlib/array/float64' );
+* var filled = require( '@stdlib/array/base/filled' );
+* var ndarray2array = require( '@stdlib/ndarray/base/to-array' );
+* var base = require( '@stdlib/ndarray/base/every-by' );
+*
+* function clbk( value ) {
+*     return value > 0.0;
+* }
+*
+* // Create data buffers:
+* var xbuf = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 0.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
+* var ybuf = filled( false, 3 );
+*
+* // Define the array shapes:
+* var xsh = [ 1, 1, 1, 1, 3, 2, 2 ];
+* var ysh = [ 1, 1, 1, 1, 3 ];
+*
+* // Define the array strides:
+* var sx = [ 12, 12, 12, 12, 4, 2, 1 ];
+* var sy = [ 3, 3, 3, 3, 1 ];
+*
+* // Define the index offsets:
+* var ox = 0;
+* var oy = 0;
+*
+* // Create an input ndarray-like object:
+* var x = {
+*     'dtype': 'float64',
+*     'data': xbuf,
+*     'shape': xsh,
+*     'strides': sx,
+*     'offset': ox,
+*     'order': 'row-major'
+* };
+*
+* // Create an output ndarray-like object:
+* var y = {
+*     'dtype': 'generic',
+*     'data': ybuf,
+*     'shape': ysh,
+*     'strides': sy,
+*     'offset': oy,
+*     'order': 'row-major'
+* };
+*
+* // Initialize ndarray-like objects representing sub-array views:
+* var views = [
+*     {
+*         'dtype': x.dtype,
+*         'data': x.data,
+*         'shape': [ 2, 2 ],
+*         'strides': [ 2, 1 ],
+*         'offset': x.offset,
+*         'order': x.order
+*     }
+* ];
+*
+* // Perform a reduction:
+* unary5d( base, [ x, y ], views, [ 12, 12, 12, 12, 4 ], [ 5, 6 ], true, {}, clbk );
+*
+* var arr = ndarray2array( y.data, y.shape, y.strides, y.offset, y.order );
+* // returns [ [ [ [ [ true, false, true ] ] ] ] ]
+*/
+function unary5d( fcn, arrays, views, strides, d, isRowMajor, opts, clbk, thisArg ) { // eslint-disable-line max-len
+	var wrappedClbk;
+	var ybuf;
+	var lidx;
+	var idx;
+	var dv0;
+	var dv1;
+	var dv2;
+	var dv3;
+	var dv4;
+	var sh;
+	var S0;
+	var S1;
+	var S2;
+	var S3;
+	var S4;
+	var sv;
+	var iv;
+	var i0;
+	var i1;
+	var i2;
+	var i3;
+	var i4;
+	var y;
+	var i;
+
+	// Note on variable naming convention: S#, dv#, i# where # corresponds to the loop number, with `0` being the innermost loop...
+
+	// Resolve the output ndarray and associated shape:
+	y = arrays[ 1 ];
+	sh = y.shape;
+	idx = zeroTo( sh.length );
+
+	// Extract loop variables for purposes of loop interchange: dimensions and loop offset (pointer) increments...
+	if ( isRowMajor ) {
+		// For row-major ndarrays, the last dimensions have the fastest changing indices...
+		S0 = sh[ 4 ];
+		S1 = sh[ 3 ];
+		S2 = sh[ 2 ];
+		S3 = sh[ 1 ];
+		S4 = sh[ 0 ];
+		dv0 = [ strides[4] ];                     // offset increment for innermost loop
+		dv1 = [ strides[3] - ( S0*strides[4] ) ];
+		dv2 = [ strides[2] - ( S1*strides[3] ) ];
+		dv3 = [ strides[1] - ( S2*strides[2] ) ];
+		dv4 = [ strides[0] - ( S3*strides[1] ) ]; // offset increment for outermost loop
+		for ( i = 1; i < arrays.length; i++ ) {
+			sv = arrays[ i ].strides;
+			dv0.push( sv[4] );
+			dv1.push( sv[3] - ( S0*sv[4] ) );
+			dv2.push( sv[2] - ( S1*sv[3] ) );
+			dv3.push( sv[1] - ( S2*sv[2] ) );
+			dv4.push( sv[0] - ( S3*sv[1] ) );
+		}
+	} else { // order === 'column-major'
+		// For column-major ndarrays, the first dimensions have the fastest changing indices...
+		S0 = sh[ 0 ];
+		S1 = sh[ 1 ];
+		S2 = sh[ 2 ];
+		S3 = sh[ 3 ];
+		S4 = sh[ 4 ];
+		dv0 = [ strides[0] ];                     // offset increment for innermost loop
+		dv1 = [ strides[1] - ( S0*strides[0] ) ];
+		dv2 = [ strides[2] - ( S1*strides[1] ) ];
+		dv3 = [ strides[3] - ( S2*strides[2] ) ];
+		dv4 = [ strides[4] - ( S3*strides[3] ) ]; // offset increment for outermost loop
+		for ( i = 1; i < arrays.length; i++ ) {
+			sv = arrays[ i ].strides;
+			dv0.push( sv[0] );
+			dv1.push( sv[1] - ( S0*sv[0] ) );
+			dv2.push( sv[2] - ( S1*sv[1] ) );
+			dv3.push( sv[3] - ( S2*sv[2] ) );
+			dv4.push( sv[4] - ( S3*sv[3] ) );
+		}
+		idx = reverse( idx );
+	}
+	// Resolve a list of pointers to the first indexed elements in the respective ndarrays:
+	iv = offsets( arrays );
+
+	// Cache a reference to the output ndarray buffer:
+	ybuf = y.data;
+
+	// Iterate over the non-reduced ndarray dimensions...
+	for ( i4 = 0; i4 < S4; i4++ ) {
+		for ( i3 = 0; i3 < S3; i3++ ) {
+			for ( i2 = 0; i2 < S2; i2++ ) {
+				for ( i1 = 0; i1 < S1; i1++ ) {
+					for ( i0 = 0; i0 < S0; i0++ ) {
+						setViewOffsets( views, iv );
+						lidx = take( [ i4, i3, i2, i1, i0 ], idx );
+						wrappedClbk = wrap( lidx, d, arrays[ 0 ], clbk, thisArg ); // eslint-disable-line max-len
+						ybuf[ iv[1] ] = fcn( views, wrappedClbk );
+						incrementOffsets( iv, dv0 );
+					}
+					incrementOffsets( iv, dv1 );
+				}
+				incrementOffsets( iv, dv2 );
+			}
+			incrementOffsets( iv, dv3 );
+		}
+		incrementOffsets( iv, dv4 );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = unary5d;