/**
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* @license
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* Copyright 2019 Google LLC. 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 {Conv2DInfo} from '../../ops/conv_util';
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import {getGlslDifferences} from './glsl_version';
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import {GPGPUProgram} from './gpgpu_math';
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export class Im2ColPackedProgram implements GPGPUProgram {
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variableNames = ['A'];
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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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outputShape: number[], inputShape: number[], convInfo: Conv2DInfo) {
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this.outputShape = outputShape;
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const {
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filterWidth,
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inChannels,
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strideWidth,
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strideHeight,
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padInfo,
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outWidth,
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dilationWidth,
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dilationHeight,
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dataFormat
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} = convInfo;
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const {left, top} = padInfo;
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const itemsPerBlockRow = inChannels * filterWidth;
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const glsl = getGlslDifferences();
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const isChannelsLast = dataFormat === 'channelsLast';
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const rowDim = isChannelsLast ? 0 : 1;
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const colDim = isChannelsLast ? 1 : 2;
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let unrolled = ``;
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for (let row = 0; row <= 1; row++) {
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for (let col = 0; col <= 1; col++) {
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unrolled += `
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blockIndex = rc.y + ${col};
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pos = rc.x + ${row};
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if(blockIndex < ${outputShape[1]} && pos < ${outputShape[0]}) {
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offsetY = int(blockIndex / (${outWidth})) * ${strideHeight} - ${
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top};
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d0 = offsetY + ${dilationHeight} * (pos / ${itemsPerBlockRow});
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if(d0 < ${inputShape[rowDim]} && d0 >= 0) {
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offsetX = int(mod(float(blockIndex), ${outWidth}.) * ${
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strideWidth}. - ${left}.);
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d1 = offsetX + ${dilationWidth} * (int(mod(float(pos), ${
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itemsPerBlockRow}.) / ${inChannels}.));
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if(d1 < ${inputShape[colDim]} && d1 >= 0) {
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ch = int(mod(float(pos), ${inChannels}.));
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if (${isChannelsLast}) {
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innerDims = vec2(d1, ch);
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result[${row * 2 + col}] = getChannel(
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getA(d0, int(innerDims.x),
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int(innerDims.y)), innerDims);
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} else {
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innerDims = vec2(d0, d1);
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result[${row * 2 + col}] = getChannel(
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getA(ch, int(innerDims.x),
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int(innerDims.y)), innerDims);
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}
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}
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}
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}
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`;
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}
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}
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this.userCode = `
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void main() {
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ivec2 rc = getOutputCoords();
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vec4 result = vec4(0);
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int blockIndex, pos, offsetY, d0, offsetX, d1, ch;
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vec2 innerDims;
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${unrolled}
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${glsl.output} = result;
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}
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`;
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}
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}
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