/**
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* @license
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* Copyright 2020 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 { env, TopK, util } from '@tensorflow/tfjs-core';
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import { topKImplCPU } from '../kernel_utils/shared';
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import { MergeProgram, SwapProgram } from '../top_k_gpu';
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import { fill } from './Fill';
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import { gatherV2 } from './GatherV2';
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import { reshape } from './Reshape';
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import { slice } from './Slice';
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function disposeIntermediateTensorInfoOrNull(backend, tensorInfo) {
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if (tensorInfo !== null) {
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backend.disposeIntermediateTensorInfo(tensorInfo);
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}
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}
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function roundUpToPow2(num) {
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let pow2 = 1;
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while (pow2 < num) {
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pow2 *= 2;
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}
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return pow2;
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}
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// Based on Algorithm 2 of Bitonic Top K, ref:
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// https://anilshanbhag.in/static/papers/gputopk_sigmod18.pdf
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export function topK(args) {
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const { inputs, backend, attrs } = args;
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const { x } = inputs;
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const { k, sorted } = attrs;
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// Empirically determined constant used to determine last dim threshold for
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// handing off execution to the CPU.
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const TOPK_LAST_DIM_CPU_HANDOFF_SIZE_THRESHOLD = env().getNumber('TOPK_LAST_DIM_CPU_HANDOFF_SIZE_THRESHOLD');
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// Empirically determined constant used to determine k threshold for handing
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// off execution to the CPU.
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const TOPK_K_CPU_HANDOFF_THRESHOLD = env().getNumber('TOPK_K_CPU_HANDOFF_THRESHOLD');
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const xShape = x.shape;
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const lastDim = xShape[xShape.length - 1];
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if (backend.shouldExecuteOnCPU([x]) ||
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lastDim < TOPK_LAST_DIM_CPU_HANDOFF_SIZE_THRESHOLD ||
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k > TOPK_K_CPU_HANDOFF_THRESHOLD) {
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const xVals = backend.readSync(x.dataId);
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const [allTopKVals, allTopKIndices] = topKImplCPU(xVals, xShape, x.dtype, k, sorted);
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return [
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backend.makeTensorInfo(allTopKVals.shape, allTopKVals.dtype, allTopKVals.values),
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backend.makeTensorInfo(allTopKIndices.shape, allTopKIndices.dtype, allTopKIndices.values)
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];
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}
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if (k === 0) {
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xShape[xShape.length - 1] = 0;
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return [
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backend.makeTensorInfo(xShape, x.dtype, []),
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backend.makeTensorInfo(xShape, 'int32', [])
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];
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}
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if (lastDim === 1 /* firstPass */) {
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return [
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x, fill({ attrs: { shape: xShape, dtype: 'int32', value: 0 }, backend })
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];
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}
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// Eagerly unpack x input since it is passed in to all the shaders which
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// require unpacked inputs.
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const xtexData = backend.texData.get(x.dataId);
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const xIsPacked = xtexData !== null && xtexData.isPacked;
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const xUnPacked = xIsPacked ? backend.unpackTensor(x) : x;
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// Reshape into a 2d tensor [batch, lastDim] and compute topk along lastDim.
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const xSize = util.sizeFromShape(xShape);
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const batch = xSize / lastDim;
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const x2D = reshape({ inputs: { x: xUnPacked }, attrs: { shape: [batch, lastDim] }, backend });
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if (xIsPacked) {
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disposeIntermediateTensorInfoOrNull(backend, xUnPacked);
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}
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const kPow2 = roundUpToPow2(k);
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const lastDimPow2 = roundUpToPow2(lastDim);
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// Only the indices containing the top K are kept at every step to reduce
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// number of outputs in the GPU algorithms, so once the final set of indices
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// is computed then gather is used to grab the corresponding values
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// from the original input.
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let indices = null;
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// GPU algorithm always takes in an indices input but this input is not used
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// on the first run of a GPU algorithm, therefore if indices is null we simply
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// pass in x2D instead of it but the value will not actually be used
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const getInputs = () => indices === null ? [x2D, x2D] : [x2D, indices];
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const runSwap = (dir, inc, shape) => {
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const inputs = getInputs();
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const program = new SwapProgram(shape);
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const fistPass = indices === null ? 1 : 0;
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const customValues = [[lastDim], [fistPass], [Number.NEGATIVE_INFINITY], [dir], [inc]];
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const prevIndices = indices;
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indices = backend.runWebGLProgram(program, inputs, 'int32', customValues);
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disposeIntermediateTensorInfoOrNull(backend, prevIndices);
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};
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// Step 1: local sort
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for (let len = 1; len < kPow2; len *= 2) {
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const dir = len * 2;
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for (let inc = len; inc >= 1; inc /= 2) {
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runSwap(dir, inc, [batch, lastDimPow2]);
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}
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}
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// Step 2: merge
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for (let indicesSize = lastDimPow2; indicesSize > kPow2; indicesSize /= 2) {
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const inputs = getInputs();
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const mergeProgram = new MergeProgram([batch, indicesSize / 2]);
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const firstPass = indices === null ? 1 : 0;
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const customValues = [[lastDim], [firstPass], [kPow2]];
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const prevIndices = indices;
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indices =
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backend.runWebGLProgram(mergeProgram, inputs, 'int32', customValues);
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disposeIntermediateTensorInfoOrNull(backend, prevIndices);
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// Step 3: rebuild
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const len = kPow2 / 2;
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const dir = len * 2;
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for (let inc = len; inc >= 1; inc /= 2) {
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runSwap(dir, inc, indices.shape);
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}
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}
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// Keep only the requested top K results instead of kPow2
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let prevIndices = indices;
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indices = slice({ inputs: { x: indices }, backend, attrs: { begin: 0, size: [batch, k] } });
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disposeIntermediateTensorInfoOrNull(backend, prevIndices);
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// Gather values on last dimension
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let values = gatherV2({ inputs: { x: x2D, indices }, backend, attrs: { axis: 1, batchDims: 1 } });
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disposeIntermediateTensorInfoOrNull(backend, x2D);
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// Reshape back to the original input shape, except that the last
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// dimension is k.
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const newShape = xShape.slice(0, -1);
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newShape.push(k);
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prevIndices = indices;
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indices = reshape({ inputs: { x: indices }, attrs: { shape: newShape }, backend });
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disposeIntermediateTensorInfoOrNull(backend, prevIndices);
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const prevValues = values;
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values = reshape({ inputs: { x: values }, attrs: { shape: newShape }, backend });
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disposeIntermediateTensorInfoOrNull(backend, prevValues);
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return [values, indices];
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}
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export const topKConfig = {
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kernelName: TopK,
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backendName: 'webgl',
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kernelFunc: topK
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};
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//# 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* @license\n * Copyright 2020 Google LLC. All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n * =============================================================================\n */\n\nimport {env, KernelConfig, KernelFunc, NumericDataType, TensorInfo, TopK, TopKAttrs, TopKInputs, TypedArray, util} from '@tensorflow/tfjs-core';\n\nimport {MathBackendWebGL} from '../backend_webgl';\nimport {topKImplCPU} from '../kernel_utils/shared';\nimport {MergeProgram, SwapProgram} from '../top_k_gpu';\nimport {fill} from './Fill';\nimport {gatherV2} from './GatherV2';\nimport {reshape} from './Reshape';\nimport {slice} from './Slice';\n\nfunction disposeIntermediateTensorInfoOrNull(\n    backend: MathBackendWebGL, tensorInfo: TensorInfo) {\n  if (tensorInfo !== null) {\n    backend.disposeIntermediateTensorInfo(tensorInfo);\n  }\n}\n\nfunction roundUpToPow2(num: number) {\n  let pow2 = 1;\n  while (pow2 < num) {\n    pow2 *= 2;\n  }\n  return pow2;\n}\n\n// Based on Algorithm 2 of Bitonic Top K, ref:\n// https://anilshanbhag.in/static/papers/gputopk_sigmod18.pdf\nexport function topK(\n    args: {inputs: TopKInputs, backend: MathBackendWebGL, attrs: TopKAttrs}):\n    TensorInfo[] {\n  const {inputs, backend, attrs} = args;\n  const {x} = inputs;\n  const {k, sorted} = attrs;\n\n  // Empirically determined constant used to determine last dim threshold for\n  // handing off execution to the CPU.\n  const TOPK_LAST_DIM_CPU_HANDOFF_SIZE_THRESHOLD =\n      env().getNumber('TOPK_LAST_DIM_CPU_HANDOFF_SIZE_THRESHOLD');\n\n  // Empirically determined constant used to determine k threshold for handing\n  // off execution to the CPU.\n  const TOPK_K_CPU_HANDOFF_THRESHOLD =\n      env().getNumber('TOPK_K_CPU_HANDOFF_THRESHOLD');\n\n  const xShape = x.shape;\n  const lastDim = xShape[xShape.length - 1];\n\n  if (backend.shouldExecuteOnCPU([x]) ||\n      lastDim < TOPK_LAST_DIM_CPU_HANDOFF_SIZE_THRESHOLD ||\n      k > TOPK_K_CPU_HANDOFF_THRESHOLD) {\n    const xVals = backend.readSync(x.dataId) as TypedArray;\n    const [allTopKVals, allTopKIndices] =\n        topKImplCPU(xVals, xShape, x.dtype as NumericDataType, k, sorted);\n\n    return [\n      backend.makeTensorInfo(\n          allTopKVals.shape, allTopKVals.dtype, allTopKVals.values),\n      backend.makeTensorInfo(\n          allTopKIndices.shape, allTopKIndices.dtype, allTopKIndices.values)\n    ];\n  }\n\n  if (k === 0) {\n    xShape[xShape.length - 1] = 0;\n    return [\n      backend.makeTensorInfo(xShape, x.dtype, []),\n      backend.makeTensorInfo(xShape, 'int32', [])\n    ];\n  }\n\n  if (lastDim === 1 /* firstPass */) {\n    return [\n      x, fill({attrs: {shape: xShape, dtype: 'int32', value: 0}, backend})\n    ];\n  }\n\n  // Eagerly unpack x input since it is passed in to all the shaders which\n  // require unpacked inputs.\n  const xtexData = backend.texData.get(x.dataId);\n  const xIsPacked = xtexData !== null && xtexData.isPacked;\n  const xUnPacked = xIsPacked ? backend.unpackTensor(x) : x;\n\n  // Reshape into a 2d tensor [batch, lastDim] and compute topk along lastDim.\n  const xSize = util.sizeFromShape(xShape);\n  const batch = xSize / lastDim;\n  const x2D = reshape(\n      {inputs: {x: xUnPacked}, attrs: {shape: [batch, lastDim]}, backend});\n\n  if (xIsPacked) {\n    disposeIntermediateTensorInfoOrNull(backend, xUnPacked);\n  }\n\n  const kPow2 = roundUpToPow2(k);\n  const lastDimPow2 = roundUpToPow2(lastDim);\n\n  // Only the indices containing the top K are kept at every step to reduce\n  // number of outputs in the GPU algorithms, so once the final set of indices\n  // is computed then gather is used to grab the corresponding values\n  // from the original input.\n  let indices: TensorInfo = null;\n\n  // GPU algorithm always takes in an indices input but this input is not used\n  // on the first run of a GPU algorithm, therefore if indices is null we simply\n  // pass in x2D instead of it but the value will not actually be used\n  const getInputs = () => indices === null ? [x2D, x2D] : [x2D, indices];\n\n  const runSwap = (dir: number, inc: number, shape: number[]) => {\n    const inputs = getInputs();\n    const program = new SwapProgram(shape);\n    const fistPass = indices === null ? 1 : 0;\n    const customValues =\n        [[lastDim], [fistPass], [Number.NEGATIVE_INFINITY], [dir], [inc]];\n    const prevIndices = indices;\n    indices = backend.runWebGLProgram(program, inputs, 'int32', customValues);\n    disposeIntermediateTensorInfoOrNull(backend, prevIndices);\n  };\n\n  // Step 1: local sort\n  for (let len = 1; len < kPow2; len *= 2) {\n    const dir = len * 2;\n    for (let inc = len; inc >= 1; inc /= 2) {\n      runSwap(dir, inc, [batch, lastDimPow2]);\n    }\n  }\n\n  // Step 2: merge\n  for (let indicesSize = lastDimPow2; indicesSize > kPow2; indicesSize /= 2) {\n    const inputs = getInputs();\n    const mergeProgram = new MergeProgram([batch, indicesSize / 2]);\n    const firstPass = indices === null ? 1 : 0;\n    const customValues = [[lastDim], [firstPass], [kPow2]];\n    const prevIndices = indices;\n    indices =\n        backend.runWebGLProgram(mergeProgram, inputs, 'int32', customValues);\n    disposeIntermediateTensorInfoOrNull(backend, prevIndices);\n\n    // Step 3: rebuild\n    const len = kPow2 / 2;\n    const dir = len * 2;\n    for (let inc = len; inc >= 1; inc /= 2) {\n      runSwap(dir, inc, indices.shape);\n    }\n  }\n\n  // Keep only the requested top K results instead of kPow2\n  let prevIndices = indices;\n  indices = slice(\n      {inputs: {x: indices}, backend, attrs: {begin: 0, size: [batch, k]}});\n  disposeIntermediateTensorInfoOrNull(backend, prevIndices);\n\n  // Gather values on last dimension\n  let values = gatherV2(\n      {inputs: {x: x2D, indices}, backend, attrs: {axis: 1, batchDims: 1}});\n  disposeIntermediateTensorInfoOrNull(backend, x2D);\n\n  // Reshape back to the original input shape, except that the last\n  // dimension is k.\n  const newShape = xShape.slice(0, -1);\n  newShape.push(k);\n\n  prevIndices = indices;\n  indices = reshape({inputs: {x: indices}, attrs: {shape: newShape}, backend});\n  disposeIntermediateTensorInfoOrNull(backend, prevIndices);\n\n  const prevValues = values;\n  values = reshape({inputs: {x: values}, attrs: {shape: newShape}, backend});\n  disposeIntermediateTensorInfoOrNull(backend, prevValues);\n\n  return [values, indices];\n}\n\nexport const topKConfig: KernelConfig = {\n  kernelName: TopK,\n  backendName: 'webgl',\n  kernelFunc: topK as unknown as KernelFunc\n};\n"]}
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