1 | /**
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2 | * @license
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3 | * Copyright 2020 Google LLC. All Rights Reserved.
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | * =============================================================================
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16 | */
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17 | import { nonMaxSuppressionV3Impl } from '../../backends/non_max_suppression_impl';
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18 | import { convertToTensor } from '../../tensor_util_env';
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19 | import { nonMaxSuppSanityCheck } from '../nonmax_util';
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20 | import { tensor1d } from '../tensor1d';
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21 | /**
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22 | * Performs non maximum suppression of bounding boxes based on
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23 | * iou (intersection over union).
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24 | *
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25 | * This is the async version of `nonMaxSuppression`
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26 | *
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27 | * @param boxes a 2d tensor of shape `[numBoxes, 4]`. Each entry is
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28 | * `[y1, x1, y2, x2]`, where `(y1, x1)` and `(y2, x2)` are the corners of
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29 | * the bounding box.
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30 | * @param scores a 1d tensor providing the box scores of shape `[numBoxes]`.
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31 | * @param maxOutputSize The maximum number of boxes to be selected.
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32 | * @param iouThreshold A float representing the threshold for deciding whether
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33 | * boxes overlap too much with respect to IOU. Must be between [0, 1].
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34 | * Defaults to 0.5 (50% box overlap).
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35 | * @param scoreThreshold A threshold for deciding when to remove boxes based
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36 | * on score. Defaults to -inf, which means any score is accepted.
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37 | * @return A 1D tensor with the selected box indices.
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38 | *
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39 | * @doc {heading: 'Operations', subheading: 'Images', namespace: 'image'}
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40 | */
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41 | async function nonMaxSuppressionAsync_(boxes, scores, maxOutputSize, iouThreshold = 0.5, scoreThreshold = Number.NEGATIVE_INFINITY) {
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42 | const $boxes = convertToTensor(boxes, 'boxes', 'nonMaxSuppressionAsync');
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43 | const $scores = convertToTensor(scores, 'scores', 'nonMaxSuppressionAsync');
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44 | const inputs = nonMaxSuppSanityCheck($boxes, $scores, maxOutputSize, iouThreshold, scoreThreshold);
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45 | maxOutputSize = inputs.maxOutputSize;
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46 | iouThreshold = inputs.iouThreshold;
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47 | scoreThreshold = inputs.scoreThreshold;
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48 | const boxesAndScores = await Promise.all([$boxes.data(), $scores.data()]);
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49 | const boxesVals = boxesAndScores[0];
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50 | const scoresVals = boxesAndScores[1];
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51 | // We call a cpu based impl directly with the typedarray data here rather
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52 | // than a kernel because all kernels are synchronous (and thus cannot await
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53 | // .data()).
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54 | const { selectedIndices } = nonMaxSuppressionV3Impl(boxesVals, scoresVals, maxOutputSize, iouThreshold, scoreThreshold);
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55 | if ($boxes !== boxes) {
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56 | $boxes.dispose();
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57 | }
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58 | if ($scores !== scores) {
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59 | $scores.dispose();
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60 | }
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61 | return tensor1d(selectedIndices, 'int32');
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62 | }
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63 | export const nonMaxSuppressionAsync = nonMaxSuppressionAsync_;
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64 | //# 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