/**
|
* @license
|
* Copyright 2020 Google LLC. All Rights Reserved.
|
* 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.
|
* =============================================================================
|
*/
|
|
import * as backend_util from '../../../backends/backend_util';
|
import {DataType, NumericDataType, TypedArray} from '../../../types';
|
import * as util from '../../../util';
|
|
export function broadcastedBinaryOp(
|
aShape: number[], bShape: number[], aVals: TypedArray, bVals: TypedArray,
|
dtype: DataType,
|
op: (a: number, b: number) => number): [TypedArray, number[]] {
|
const newShape = backend_util.assertAndGetBroadcastShape(aShape, bShape);
|
|
const resultRank = newShape.length;
|
const resultStrides = util.computeStrides(newShape);
|
const resultSize = util.sizeFromShape(newShape);
|
|
const result =
|
util.getTypedArrayFromDType(dtype as NumericDataType, resultSize);
|
|
const aRank = aShape.length;
|
const bRank = bShape.length;
|
|
const aStrides = util.computeStrides(aShape);
|
const bStrides = util.computeStrides(bShape);
|
|
const aBroadcastDims = backend_util.getBroadcastDims(aShape, newShape);
|
const bBroadcastDims = backend_util.getBroadcastDims(bShape, newShape);
|
|
if (aBroadcastDims.length + bBroadcastDims.length === 0) {
|
for (let i = 0; i < result.length; ++i) {
|
result[i] = op(aVals[i % aVals.length], bVals[i % bVals.length]);
|
}
|
} else {
|
for (let i = 0; i < result.length; ++i) {
|
const loc = util.indexToLoc(i, resultRank, resultStrides);
|
|
const aLoc = loc.slice(-aRank);
|
aBroadcastDims.forEach(d => aLoc[d] = 0);
|
const aIndex = util.locToIndex(aLoc, aRank, aStrides);
|
|
const bLoc = loc.slice(-bRank);
|
bBroadcastDims.forEach(d => bLoc[d] = 0);
|
const bIndex = util.locToIndex(bLoc, bRank, bStrides);
|
|
result[i] = op(aVals[aIndex], bVals[bIndex]);
|
}
|
}
|
|
return [result, newShape];
|
}
|