/**
|
* @license
|
* Copyright 2017 Google Inc. 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 {ReduceInfo} from '../../ops/reduce_util';
|
import {GPGPUProgram} from './gpgpu_math';
|
|
export class ArgMinMaxProgram implements GPGPUProgram {
|
variableNames = ['A'];
|
outputShape: number[];
|
userCode: string;
|
|
constructor(reduceInfo: ReduceInfo, op: 'max'|'min', firstPass: boolean) {
|
const windowSize = reduceInfo.windowSize;
|
const batchSize = reduceInfo.batchSize;
|
const inSize = reduceInfo.inSize;
|
const outSize = Math.ceil(inSize / windowSize);
|
if (!firstPass) {
|
this.variableNames.push('bestIndicesA');
|
}
|
this.outputShape = [batchSize, outSize];
|
const compOp = (op === 'max') ? '>' : '<';
|
const indexSnippet = firstPass ?
|
'inOffset + i;' :
|
'round(getBestIndicesA(batch, inOffset + i));';
|
|
this.userCode = `
|
void main() {
|
ivec2 coords = getOutputCoords();
|
int batch = coords[0];
|
int outIdx = coords[1];
|
int inOffset = outIdx * ${windowSize};
|
|
int bestIndex = inOffset;
|
float bestValue = getA(batch, bestIndex);
|
|
for (int i = 0; i < ${windowSize}; i++) {
|
int inIdx = ${indexSnippet};
|
float candidate = getA(batch, inIdx);
|
if (candidate ${compOp} bestValue) {
|
bestValue = candidate;
|
bestIndex = inIdx;
|
}
|
}
|
setOutput(float(bestIndex));
|
}
|
`;
|
}
|
}
|