/**
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* @license
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* Copyright 2017 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 * as broadcast_util from '../../ops/broadcast_util';
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import {GPGPUProgram} from './gpgpu_math';
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export class BatchNormProgram implements GPGPUProgram {
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variableNames: string[];
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outputShape: number[] = [];
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userCode: string;
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constructor(
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xShape: number[], meanShape: number[], varianceShape: number[],
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offsetShape: number[]|null, scaleShape: number[]|null,
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varianceEpsilon: number) {
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this.variableNames = ['x', 'mean', 'variance'];
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broadcast_util.assertAndGetBroadcastShape(xShape, meanShape);
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broadcast_util.assertAndGetBroadcastShape(xShape, varianceShape);
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let offsetSnippet = '0.0';
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if (offsetShape != null) {
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broadcast_util.assertAndGetBroadcastShape(xShape, offsetShape);
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this.variableNames.push('offset');
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offsetSnippet = 'getOffsetAtOutCoords()';
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}
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let scaleSnippet = '1.0';
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if (scaleShape != null) {
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broadcast_util.assertAndGetBroadcastShape(xShape, scaleShape);
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this.variableNames.push('scale');
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scaleSnippet = 'getScaleAtOutCoords()';
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}
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this.outputShape = xShape;
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this.userCode = `
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void main() {
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float x = getXAtOutCoords();
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float mean = getMeanAtOutCoords();
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float variance = getVarianceAtOutCoords();
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float offset = ${offsetSnippet};
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float scale = ${scaleSnippet};
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float inv = scale * inversesqrt(variance + float(${varianceEpsilon}));
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setOutput(dot(vec3(x, -mean, offset), vec3(inv, inv, 1)));
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}
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`;
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}
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}
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