/**
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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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export class MatMulPackedProgram implements GPGPUProgram {
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variableNames = ['matrixA', 'matrixB'];
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packedInputs = true;
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packedOutput = true;
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outputShape: number[];
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userCode: string;
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constructor(
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aShape: [number, number, number], outputShape: [number, number, number],
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transposeA = false, transposeB = false, addBias = false,
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activation: string = null, hasPreluActivation = false) {
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this.outputShape = outputShape;
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const sharedDim = transposeA ? aShape[1] : aShape[2];
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const sharedDimensionPacked = Math.ceil(sharedDim / 2);
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const aSample = transposeA ? 'i * 2, rc.y' : 'rc.y, i * 2';
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const bSample = transposeB ? 'rc.z, i * 2' : 'i * 2, rc.z';
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const aSwizzle = transposeA ? ['a.xxyy', 'a.zzww'] : ['a.xxzz', 'a.yyww'];
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const bSwizzle = transposeB ? ['b.xzxz', 'b.ywyw'] : ['b.xyxy', 'b.zwzw'];
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let activationSnippet = '', applyActivationSnippet = '';
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if (activation) {
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if (hasPreluActivation) {
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activationSnippet = `vec4 activation(vec4 a) {
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vec4 b = getPreluActivationWeightsAtOutCoords();
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${activation}
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}`;
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} else {
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activationSnippet = `vec4 activation(vec4 x) {
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${activation}
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}`;
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}
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applyActivationSnippet = `result = activation(result);`;
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}
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const addBiasSnippet = addBias ? 'result += getBiasAtOutCoords();' : '';
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if (addBias) {
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this.variableNames.push('bias');
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}
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if (hasPreluActivation) {
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this.variableNames.push('preluActivationWeights');
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}
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this.userCode = `
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${activationSnippet}
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const float sharedDimension = ${sharedDimensionPacked}.0;
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vec4 dot2x2ARowBCol(ivec3 rc) {
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vec4 result = vec4(0);
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for (int i = 0; i < ${sharedDimensionPacked}; i++) {
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vec4 a = getMatrixA(rc.x, ${aSample});
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vec4 b = getMatrixB(rc.x, ${bSample});
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// These swizzled products need to be separately added.
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// See: https://github.com/tensorflow/tfjs/issues/1735
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result += (${aSwizzle[0]} * ${bSwizzle[0]});
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result += (${aSwizzle[1]} * ${bSwizzle[1]});
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}
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return result;
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}
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void main() {
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ivec3 rc = getOutputCoords();
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vec4 result = dot2x2ARowBCol(rc);
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${addBiasSnippet}
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${applyActivationSnippet}
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setOutput(result);
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}
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`;
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}
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}
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