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YOLO9000:Better, Faster, StrongerJoseph Redmon , Ali Farhadi University of Washington , Allen Institute for AI introduce YOLO9000, a state-of-the-art, real -timeobject detection system that can detect over 9000 objectcategories. First we propose various improvements to theYOLO detection method, both novel and drawn from priorwork. The improved model, YOLOv2, is state-of-the-art onstandard detection tasks likePASCALVOC and COCO. Us-ing a novel, multi-scale training method the same YOLOv2model can run at varying sizes, offering an easy tradeoffbetween speed and accuracy. At 67 FPS, YOLOv2 mAP on VOC 2007. At 40 FPS, YOLOv2 gets , outperforming state-of-the-art methods like Faster R-CNN with ResNet and SSD while still running significantlyfaster. Finally we propose a method to jointly train on ob-ject detection and classification. Using this method we trainYOLO9000 simultaneously on the COCO detection datasetand the ImageNet classification dataset.

only having detection data for 44 of the 200 classes. On the 156 classes not in COCO, YOLO9000 gets 16.0 mAP. But YOLO can detect more than just 200 classes; it predicts de-tections for more than 9000 different object categories. And it still runs in real-time. 1. Introduction General purpose object detection should be fast, accu-

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  Time, Real, Object, Detection, Object detection

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