/**
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* @license
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* Copyright 2018 Google Inc. 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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import {GPGPUProgram} from './gpgpu_math';
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import {getCoordsDataType} from './shader_compiler';
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export class ScatterProgram implements GPGPUProgram {
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variableNames = ['updates', 'indices', 'defaultValue'];
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outputShape: number[];
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userCode: string;
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constructor(
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updateSize: number, sliceDim: number, indicesRank: number,
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updatesRank: number, strides: number[], shape: number[],
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summingDupeIndex = true) {
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this.outputShape = shape;
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const stridesType = getCoordsDataType(strides.length);
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const dtype = getCoordsDataType(shape.length);
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let indicesString = '';
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if (indicesRank === 1) {
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indicesString = 'i';
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} else if (indicesRank === 2) {
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indicesString = 'i, j';
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}
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const indicesSnippet = `getIndices(${indicesString})`;
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let updatesString = '';
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if (updatesRank === 1) {
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updatesString = 'i';
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} else if (updatesRank === 2) {
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updatesString = 'i, coords[1]';
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}
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const updatesSnippet = `getUpdates(${updatesString})`;
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const strideString = sliceDim > 1 ? 'strides[j]' : 'strides';
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this.userCode = `
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${stridesType} strides = ${stridesType}(${strides});
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void main() {
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${dtype} coords = getOutputCoords();
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float sum = 0.0;
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bool found = false;
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for (int i = 0; i < ${updateSize}; i++) {
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int flattenedIndex = 0;
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for (int j = 0; j < ${sliceDim}; j++) {
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int index = round(${indicesSnippet});
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flattenedIndex += index * ${strideString};
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}
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if (flattenedIndex == coords[0]) {
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sum += ${updatesSnippet};
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found = true;
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}
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}
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setOutput(mix(getDefaultValue(), sum, float(found)));
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}
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`;
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}
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}
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