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2025-06-12 7b72ac13a83764a662159d4a49b7fffb90476ecb

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/**
 * @license
 * Copyright 2020 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 { binaryInsert } from './non_max_suppression_util';
export function nonMaxSuppressionV3Impl(boxes, scores, maxOutputSize, iouThreshold, scoreThreshold) {
    return nonMaxSuppressionImpl_(boxes, scores, maxOutputSize, iouThreshold, scoreThreshold, 0 /* softNmsSigma */);
}
export function nonMaxSuppressionV4Impl(boxes, scores, maxOutputSize, iouThreshold, scoreThreshold, padToMaxOutputSize) {
    return nonMaxSuppressionImpl_(boxes, scores, maxOutputSize, iouThreshold, scoreThreshold, 0 /* softNmsSigma */, false /* returnScoresTensor */, padToMaxOutputSize /* padToMaxOutputSize */, true
    /* returnValidOutputs */ );
}
export function nonMaxSuppressionV5Impl(boxes, scores, maxOutputSize, iouThreshold, scoreThreshold, softNmsSigma) {
    return nonMaxSuppressionImpl_(boxes, scores, maxOutputSize, iouThreshold, scoreThreshold, softNmsSigma, true /* returnScoresTensor */);
}
function nonMaxSuppressionImpl_(boxes, scores, maxOutputSize, iouThreshold, scoreThreshold, softNmsSigma, returnScoresTensor = false, padToMaxOutputSize = false, returnValidOutputs = false) {
    // The list is sorted in ascending order, so that we can always pop the
    // candidate with the largest score in O(1) time.
    const candidates = [];
    for (let i = 0; i < scores.length; i++) {
        if (scores[i] > scoreThreshold) {
            candidates.push({ score: scores[i], boxIndex: i, suppressBeginIndex: 0 });
        }
    }
    candidates.sort(ascendingComparator);
    // If softNmsSigma is 0, the outcome of this algorithm is exactly same as
    // before.
    const scale = softNmsSigma > 0 ? (-0.5 / softNmsSigma) : 0.0;
    const selectedIndices = [];
    const selectedScores = [];
    while (selectedIndices.length < maxOutputSize && candidates.length > 0) {
        const candidate = candidates.pop();
        const { score: originalScore, boxIndex, suppressBeginIndex } = candidate;
        if (originalScore < scoreThreshold) {
            break;
        }
        // Overlapping boxes are likely to have similar scores, therefore we
        // iterate through the previously selected boxes backwards in order to
        // see if candidate's score should be suppressed. We use
        // suppressBeginIndex to track and ensure a candidate can be suppressed
        // by a selected box no more than once. Also, if the overlap exceeds
        // iouThreshold, we simply ignore the candidate.
        let ignoreCandidate = false;
        for (let j = selectedIndices.length - 1; j >= suppressBeginIndex; --j) {
            const iou = intersectionOverUnion(boxes, boxIndex, selectedIndices[j]);
            if (iou >= iouThreshold) {
                ignoreCandidate = true;
                break;
            }
            candidate.score =
                candidate.score * suppressWeight(iouThreshold, scale, iou);
            if (candidate.score <= scoreThreshold) {
                break;
            }
        }
        // At this point, if `candidate.score` has not dropped below
        // `scoreThreshold`, then we know that we went through all of the
        // previous selections and can safely update `suppressBeginIndex` to the
        // end of the selected array. Then we can re-insert the candidate with
        // the updated score and suppressBeginIndex back in the candidate list.
        // If on the other hand, `candidate.score` has dropped below the score
        // threshold, we will not add it back to the candidates list.
        candidate.suppressBeginIndex = selectedIndices.length;
        if (!ignoreCandidate) {
            // Candidate has passed all the tests, and is not suppressed, so
            // select the candidate.
            if (candidate.score === originalScore) {
                selectedIndices.push(boxIndex);
                selectedScores.push(candidate.score);
            }
            else if (candidate.score > scoreThreshold) {
                // Candidate's score is suppressed but is still high enough to be
                // considered, so add back to the candidates list.
                binaryInsert(candidates, candidate, ascendingComparator);
            }
        }
    }
    // NonMaxSuppressionV4 feature: padding output to maxOutputSize.
    const validOutputs = selectedIndices.length;
    const elemsToPad = maxOutputSize - validOutputs;
    if (padToMaxOutputSize && elemsToPad > 0) {
        selectedIndices.push(...new Array(elemsToPad).fill(0));
        selectedScores.push(...new Array(elemsToPad).fill(0.0));
    }
    const result = { selectedIndices };
    if (returnScoresTensor) {
        result['selectedScores'] = selectedScores;
    }
    if (returnValidOutputs) {
        result['validOutputs'] = validOutputs;
    }
    return result;
}
function intersectionOverUnion(boxes, i, j) {
    const iCoord = boxes.subarray(i * 4, i * 4 + 4);
    const jCoord = boxes.subarray(j * 4, j * 4 + 4);
    const yminI = Math.min(iCoord[0], iCoord[2]);
    const xminI = Math.min(iCoord[1], iCoord[3]);
    const ymaxI = Math.max(iCoord[0], iCoord[2]);
    const xmaxI = Math.max(iCoord[1], iCoord[3]);
    const yminJ = Math.min(jCoord[0], jCoord[2]);
    const xminJ = Math.min(jCoord[1], jCoord[3]);
    const ymaxJ = Math.max(jCoord[0], jCoord[2]);
    const xmaxJ = Math.max(jCoord[1], jCoord[3]);
    const areaI = (ymaxI - yminI) * (xmaxI - xminI);
    const areaJ = (ymaxJ - yminJ) * (xmaxJ - xminJ);
    if (areaI <= 0 || areaJ <= 0) {
        return 0.0;
    }
    const intersectionYmin = Math.max(yminI, yminJ);
    const intersectionXmin = Math.max(xminI, xminJ);
    const intersectionYmax = Math.min(ymaxI, ymaxJ);
    const intersectionXmax = Math.min(xmaxI, xmaxJ);
    const intersectionArea = Math.max(intersectionYmax - intersectionYmin, 0.0) *
        Math.max(intersectionXmax - intersectionXmin, 0.0);
    return intersectionArea / (areaI + areaJ - intersectionArea);
}
// A Gaussian penalty function, this method always returns values in [0, 1].
// The weight is a function of similarity, the more overlap two boxes are, the
// smaller the weight is, meaning highly overlapping boxe will be significantly
// penalized. On the other hand, a non-overlapping box will not be penalized.
function suppressWeight(iouThreshold, scale, iou) {
    const weight = Math.exp(scale * iou * iou);
    return iou <= iouThreshold ? weight : 0.0;
}
function ascendingComparator(c1, c2) {
    // For objects with same scores, we make the object with the larger index go
    // first. In an array that pops from the end, this means that the object with
    // the smaller index will be popped first. This ensures the same output as
    // the TensorFlow python version.
    return (c1.score - c2.score) ||
        ((c1.score === c2.score) && (c2.boxIndex - c1.boxIndex));
}
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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 {TypedArray} from '../types';\nimport {binaryInsert} from './non_max_suppression_util';\n\n/**\n * Implementation of the NonMaxSuppression kernel shared between webgl and cpu.\n */\ninterface Candidate {\n  score: number;\n  boxIndex: number;\n  suppressBeginIndex: number;\n}\n\ninterface NonMaxSuppressionResult {\n  selectedIndices: number[];\n  selectedScores?: number[];\n  validOutputs?: number;\n}\n\nexport function nonMaxSuppressionV3Impl(\n    boxes: TypedArray, scores: TypedArray, maxOutputSize: number,\n    iouThreshold: number, scoreThreshold: number): NonMaxSuppressionResult {\n  return nonMaxSuppressionImpl_(\n      boxes, scores, maxOutputSize, iouThreshold, scoreThreshold,\n      0 /* softNmsSigma */);\n}\n\nexport function nonMaxSuppressionV4Impl(\n    boxes: TypedArray, scores: TypedArray, maxOutputSize: number,\n    iouThreshold: number, scoreThreshold: number,\n    padToMaxOutputSize: boolean): NonMaxSuppressionResult {\n  return nonMaxSuppressionImpl_(\n      boxes, scores, maxOutputSize, iouThreshold, scoreThreshold,\n      0 /* softNmsSigma */, false /* returnScoresTensor */,\n      padToMaxOutputSize /* padToMaxOutputSize */, true\n      /* returnValidOutputs */);\n}\n\nexport function nonMaxSuppressionV5Impl(\n    boxes: TypedArray, scores: TypedArray, maxOutputSize: number,\n    iouThreshold: number, scoreThreshold: number,\n    softNmsSigma: number): NonMaxSuppressionResult {\n  return nonMaxSuppressionImpl_(\n      boxes, scores, maxOutputSize, iouThreshold, scoreThreshold, softNmsSigma,\n      true /* returnScoresTensor */);\n}\n\nfunction nonMaxSuppressionImpl_(\n    boxes: TypedArray, scores: TypedArray, maxOutputSize: number,\n    iouThreshold: number, scoreThreshold: number, softNmsSigma: number,\n    returnScoresTensor = false, padToMaxOutputSize = false,\n    returnValidOutputs = false): NonMaxSuppressionResult {\n  // The list is sorted in ascending order, so that we can always pop the\n  // candidate with the largest score in O(1) time.\n  const candidates = [];\n\n  for (let i = 0; i < scores.length; i++) {\n    if (scores[i] > scoreThreshold) {\n      candidates.push({score: scores[i], boxIndex: i, suppressBeginIndex: 0});\n    }\n  }\n\n  candidates.sort(ascendingComparator);\n\n  // If softNmsSigma is 0, the outcome of this algorithm is exactly same as\n  // before.\n  const scale = softNmsSigma > 0 ? (-0.5 / softNmsSigma) : 0.0;\n\n  const selectedIndices: number[] = [];\n  const selectedScores: number[] = [];\n\n  while (selectedIndices.length < maxOutputSize && candidates.length > 0) {\n    const candidate = candidates.pop();\n    const {score: originalScore, boxIndex, suppressBeginIndex} = candidate;\n\n    if (originalScore < scoreThreshold) {\n      break;\n    }\n\n    // Overlapping boxes are likely to have similar scores, therefore we\n    // iterate through the previously selected boxes backwards in order to\n    // see if candidate's score should be suppressed. We use\n    // suppressBeginIndex to track and ensure a candidate can be suppressed\n    // by a selected box no more than once. Also, if the overlap exceeds\n    // iouThreshold, we simply ignore the candidate.\n    let ignoreCandidate = false;\n    for (let j = selectedIndices.length - 1; j >= suppressBeginIndex; --j) {\n      const iou = intersectionOverUnion(boxes, boxIndex, selectedIndices[j]);\n\n      if (iou >= iouThreshold) {\n        ignoreCandidate = true;\n        break;\n      }\n\n      candidate.score =\n          candidate.score * suppressWeight(iouThreshold, scale, iou);\n\n      if (candidate.score <= scoreThreshold) {\n        break;\n      }\n    }\n\n    // At this point, if `candidate.score` has not dropped below\n    // `scoreThreshold`, then we know that we went through all of the\n    // previous selections and can safely update `suppressBeginIndex` to the\n    // end of the selected array. Then we can re-insert the candidate with\n    // the updated score and suppressBeginIndex back in the candidate list.\n    // If on the other hand, `candidate.score` has dropped below the score\n    // threshold, we will not add it back to the candidates list.\n    candidate.suppressBeginIndex = selectedIndices.length;\n\n    if (!ignoreCandidate) {\n      // Candidate has passed all the tests, and is not suppressed, so\n      // select the candidate.\n      if (candidate.score === originalScore) {\n        selectedIndices.push(boxIndex);\n        selectedScores.push(candidate.score);\n      } else if (candidate.score > scoreThreshold) {\n        // Candidate's score is suppressed but is still high enough to be\n        // considered, so add back to the candidates list.\n        binaryInsert(candidates, candidate, ascendingComparator);\n      }\n    }\n  }\n\n  // NonMaxSuppressionV4 feature: padding output to maxOutputSize.\n  const validOutputs = selectedIndices.length;\n  const elemsToPad = maxOutputSize - validOutputs;\n\n  if (padToMaxOutputSize && elemsToPad > 0) {\n    selectedIndices.push(...new Array(elemsToPad).fill(0));\n    selectedScores.push(...new Array(elemsToPad).fill(0.0));\n  }\n\n  const result: NonMaxSuppressionResult = {selectedIndices};\n\n  if (returnScoresTensor) {\n    result['selectedScores'] = selectedScores;\n  }\n\n  if (returnValidOutputs) {\n    result['validOutputs'] = validOutputs;\n  }\n\n  return result;\n}\n\nfunction intersectionOverUnion(boxes: TypedArray, i: number, j: number) {\n  const iCoord = boxes.subarray(i * 4, i * 4 + 4);\n  const jCoord = boxes.subarray(j * 4, j * 4 + 4);\n  const yminI = Math.min(iCoord[0], iCoord[2]);\n  const xminI = Math.min(iCoord[1], iCoord[3]);\n  const ymaxI = Math.max(iCoord[0], iCoord[2]);\n  const xmaxI = Math.max(iCoord[1], iCoord[3]);\n  const yminJ = Math.min(jCoord[0], jCoord[2]);\n  const xminJ = Math.min(jCoord[1], jCoord[3]);\n  const ymaxJ = Math.max(jCoord[0], jCoord[2]);\n  const xmaxJ = Math.max(jCoord[1], jCoord[3]);\n  const areaI = (ymaxI - yminI) * (xmaxI - xminI);\n  const areaJ = (ymaxJ - yminJ) * (xmaxJ - xminJ);\n  if (areaI <= 0 || areaJ <= 0) {\n    return 0.0;\n  }\n  const intersectionYmin = Math.max(yminI, yminJ);\n  const intersectionXmin = Math.max(xminI, xminJ);\n  const intersectionYmax = Math.min(ymaxI, ymaxJ);\n  const intersectionXmax = Math.min(xmaxI, xmaxJ);\n  const intersectionArea = Math.max(intersectionYmax - intersectionYmin, 0.0) *\n      Math.max(intersectionXmax - intersectionXmin, 0.0);\n  return intersectionArea / (areaI + areaJ - intersectionArea);\n}\n\n// A Gaussian penalty function, this method always returns values in [0, 1].\n// The weight is a function of similarity, the more overlap two boxes are, the\n// smaller the weight is, meaning highly overlapping boxe will be significantly\n// penalized. On the other hand, a non-overlapping box will not be penalized.\nfunction suppressWeight(iouThreshold: number, scale: number, iou: number) {\n  const weight = Math.exp(scale * iou * iou);\n  return iou <= iouThreshold ? weight : 0.0;\n}\n\nfunction ascendingComparator(c1: Candidate, c2: Candidate) {\n  // For objects with same scores, we make the object with the larger index go\n  // first. In an array that pops from the end, this means that the object with\n  // the smaller index will be popped first. This ensures the same output as\n  // the TensorFlow python version.\n  return (c1.score - c2.score) ||\n      ((c1.score === c2.score) && (c2.boxIndex - c1.boxIndex));\n}\n"]}