Merge branch 'unary-red-sub-by' of https://github.com/headlessnode/stdlib into pr/headlessNode/7008

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/unary-reduce-subarray-by/lib/10d.js

@@ -0,0 +1,298 @@
+/**
+* @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.
+*/
+
+/* eslint-disable max-depth, max-len, max-params, max-statements */
+
+'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( './callback_wrapper.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 {NonNegativeIntegerArray} ibuf - workspace for storing iteration indices
+* @param {NonNegativeIntegerArray} ldims - list of loop dimensions
+* @param {NonNegativeIntegerArray} cdims - list of "core" dimensions
+* @param {IntegerArray} strides - loop dimension strides for the input ndarray
+* @param {boolean} isRowMajor - boolean indicating if provided arrays are in row-major order
+* @param {Options} opts - reduction function options
+* @param {boolean} hasOpts - boolean indicating whether to pass an options argument to a reduction function
+* @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 zeros = require( '@stdlib/array/base/zeros' );
+* 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, 1, 1, 1, 1, 1, 3, 2, 2 ];
+* var ysh = [ 1, 1, 1, 1, 1, 1, 1, 1, 1, 3 ];
+*
+* // Define the array strides:
+* var sx = [ 12, 12, 12, 12, 12, 12, 12, 12, 12, 4, 2, 1 ];
+* var sy = [ 3, 3, 3, 3, 3, 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
+*     }
+* ];
+*
+* // Create a workspace array for storing iteration indices:
+* var ibuf = zeros( xsh.length );
+*
+* // Define the loop and core dimensions:
+* var ldims = [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ];
+* var cdims = [ 10, 11 ];
+*
+* // Resolve the loop dimension strides for the input array:
+* var slx = [ 12, 12, 12, 12, 12, 12, 12, 12, 12, 4 ];
+*
+* // Perform a reduction:
+* unary10d( base, [ x, y ], views, ibuf, ldims, cdims, slx, true, null, false, clbk, {} );
+*
+* var arr = ndarray2array( y.data, y.shape, y.strides, y.offset, y.order );
+* // returns [ [ [ [ [ [ [ [ [ [ true, false, true ] ] ] ] ] ] ] ] ] ]
+*/
+function unary10d( fcn, arrays, views, ibuf, ldims, cdims, strides, isRowMajor, opts, hasOpts, clbk, thisArg ) {
+	var ybuf;
+	var idx;
+	var dv0;
+	var dv1;
+	var dv2;
+	var dv3;
+	var dv4;
+	var dv5;
+	var dv6;
+	var dv7;
+	var dv8;
+	var dv9;
+	var sh;
+	var S0;
+	var S1;
+	var S2;
+	var S3;
+	var S4;
+	var S5;
+	var S6;
+	var S7;
+	var S8;
+	var S9;
+	var sv;
+	var iv;
+	var i0;
+	var i1;
+	var i2;
+	var i3;
+	var i4;
+	var i5;
+	var i6;
+	var i7;
+	var i8;
+	var i9;
+	var x;
+	var y;
+	var f;
+	var i;
+
+	// Note on variable naming convention: S#, dv#, i# where # corresponds to the loop number, with `0` being the innermost loop...
+
+	// Cache a reference to the input ndarray:
+	x = arrays[ 0 ];
+
+	// 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[ 9 ];
+		S1 = sh[ 8 ];
+		S2 = sh[ 7 ];
+		S3 = sh[ 6 ];
+		S4 = sh[ 5 ];
+		S5 = sh[ 4 ];
+		S6 = sh[ 3 ];
+		S7 = sh[ 2 ];
+		S8 = sh[ 1 ];
+		S9 = sh[ 0 ];
+		dv0 = [ strides[9] ];                     // offset increment for innermost loop
+		dv1 = [ strides[8] - ( S0*strides[9] ) ];
+		dv2 = [ strides[7] - ( S1*strides[8] ) ];
+		dv3 = [ strides[6] - ( S2*strides[7] ) ];
+		dv4 = [ strides[5] - ( S3*strides[6] ) ];
+		dv5 = [ strides[4] - ( S4*strides[5] ) ];
+		dv6 = [ strides[3] - ( S5*strides[4] ) ];
+		dv7 = [ strides[2] - ( S6*strides[3] ) ];
+		dv8 = [ strides[1] - ( S7*strides[2] ) ];
+		dv9 = [ strides[0] - ( S8*strides[1] ) ]; // offset increment for outermost loop
+		for ( i = 1; i < arrays.length; i++ ) {
+			sv = arrays[ i ].strides;
+			dv0.push( sv[9] );
+			dv1.push( sv[8] - ( S0*sv[9] ) );
+			dv2.push( sv[7] - ( S1*sv[8] ) );
+			dv3.push( sv[6] - ( S2*sv[7] ) );
+			dv4.push( sv[5] - ( S3*sv[6] ) );
+			dv5.push( sv[4] - ( S4*sv[5] ) );
+			dv6.push( sv[3] - ( S5*sv[4] ) );
+			dv7.push( sv[2] - ( S6*sv[3] ) );
+			dv8.push( sv[1] - ( S7*sv[2] ) );
+			dv9.push( sv[0] - ( S8*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 ];
+		S5 = sh[ 5 ];
+		S6 = sh[ 6 ];
+		S7 = sh[ 7 ];
+		S8 = sh[ 8 ];
+		S9 = sh[ 9 ];
+		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] ) ];
+		dv5 = [ strides[5] - ( S4*strides[4] ) ];
+		dv6 = [ strides[6] - ( S5*strides[5] ) ];
+		dv7 = [ strides[7] - ( S6*strides[6] ) ];
+		dv8 = [ strides[8] - ( S7*strides[7] ) ];
+		dv9 = [ strides[9] - ( S8*strides[8] ) ]; // 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] ) );
+			dv5.push( sv[5] - ( S4*sv[4] ) );
+			dv6.push( sv[6] - ( S5*sv[5] ) );
+			dv7.push( sv[7] - ( S6*sv[6] ) );
+			dv8.push( sv[8] - ( S7*sv[7] ) );
+			dv9.push( sv[9] - ( S8*sv[8] ) );
+		}
+		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 ( i9 = 0; i9 < S9; i9++ ) {
+		for ( i8 = 0; i8 < S8; i8++ ) {
+			for ( i7 = 0; i7 < S7; i7++ ) {
+				for ( i6 = 0; i6 < S6; i6++ ) {
+					for ( i5 = 0; i5 < S5; i5++ ) {
+						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 );
+											f = wrap( x.ref, ibuf, ldims, take( [ i9, i8, i7, i6, i5, i4, i3, i2, i1, i0 ], idx ), cdims, clbk, thisArg );
+											ybuf[ iv[1] ] = ( hasOpts ) ? fcn( views, opts, f ) : fcn( views, f );
+											incrementOffsets( iv, dv0 );
+										}
+										incrementOffsets( iv, dv1 );
+									}
+									incrementOffsets( iv, dv2 );
+								}
+								incrementOffsets( iv, dv3 );
+							}
+							incrementOffsets( iv, dv4 );
+						}
+						incrementOffsets( iv, dv5 );
+					}
+					incrementOffsets( iv, dv6 );
+				}
+				incrementOffsets( iv, dv7 );
+			}
+			incrementOffsets( iv, dv8 );
+		}
+		incrementOffsets( iv, dv9 );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = unary10d;