/**
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* @license
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* Copyright 2018 Google LLC. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* =============================================================================
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*/
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/** An implementation of the Where kernel shared between cpu and webgl */
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import {buffer} from '../ops/array_ops';
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import {Tensor2D} from '../tensor';
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import {TypedArray} from '../types';
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export function whereImpl(condShape: number[], condVals: TypedArray): Tensor2D {
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const indices = [];
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for (let i = 0; i < condVals.length; i++) {
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if (condVals[i]) {
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indices.push(i);
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}
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}
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const inBuffer = buffer(condShape, 'int32');
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const out = buffer([indices.length, condShape.length], 'int32');
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for (let i = 0; i < indices.length; i++) {
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const loc = inBuffer.indexToLoc(indices[i]);
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const offset = i * condShape.length;
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out.values.set(loc, offset);
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}
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return out.toTensor() as Tensor2D;
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}
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