gx

chenyc

2025-06-12 7b72ac13a83764a662159d4a49b7fffb90476ecb

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