@tensorflow/tfjs-core/src/backends/cpu/non_max_suppression_v5.ts

Hardware-accelerated JavaScript library for machine intelligence

/**
 * @license
 * Copyright 2019 Google LLC. 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 {NamedAttrMap, NamedTensorInfoMap, registerKernel, TensorInfo} from '../../kernel_registry';
import {TypedArray} from '../../types';
import {nonMaxSuppressionV5} from '../non_max_suppression_impl';

import {MathBackendCPU} from './backend_cpu';
import {assertNotComplex} from './cpu_util';

interface NonMaxSuppressionWithScoreInputs extends NamedTensorInfoMap {
  boxes: TensorInfo;
  scores: TensorInfo;
}

interface NonMaxSuppressionWithScoreAttrs extends NamedAttrMap {
  maxOutputSize: number;
  iouThreshold: number;
  scoreThreshold: number;
  softNmsSigma: number;
}

registerKernel({
  kernelName: 'NonMaxSuppressionV5',
  backendName: 'cpu',
  kernelFunc: ({inputs, backend, attrs}) => {
    const {boxes, scores} = inputs as NonMaxSuppressionWithScoreInputs;
    const {maxOutputSize, iouThreshold, scoreThreshold, softNmsSigma} =
        attrs as NonMaxSuppressionWithScoreAttrs;

    const cpuBackend = backend as MathBackendCPU;

    assertNotComplex(boxes, 'NonMaxSuppressionWithScore');

    const boxesVals = cpuBackend.data.get(boxes.dataId).values as TypedArray;
    const scoresVals = cpuBackend.data.get(scores.dataId).values as TypedArray;

    const maxOutputSizeVal = maxOutputSize;
    const iouThresholdVal = iouThreshold;
    const scoreThresholdVal = scoreThreshold;
    const softNmsSigmaVal = softNmsSigma;

    const {selectedIndices, selectedScores} = nonMaxSuppressionV5(
        boxesVals, scoresVals, maxOutputSizeVal, iouThresholdVal,
        scoreThresholdVal, softNmsSigmaVal);

    return [selectedIndices, selectedScores];
  }
});