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 PyTorch implementation of the article "You Only Watch Once: A Unified CNN Architecture for Real-Time Spatiotemporal Action Localization". ***Code will uploaded soon!***
 
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 In this work, we present ***YOWO*** (***Y**ou **O**nly **W**atch **O**nce*), a unified CNN architecture for real-time spatiotemporal action localization in video stream. *YOWO* is a single-stage framework, the input is a clip consisting of several successive frames in a video, while the output predicts bounding box positions as well as corresponding class labels in current frame. Afterwards, with specific strategy, these detections can be linked together to generate *Action Tubes* in the whole video.
 
 Since we do not separate human detection and action classification procedures, the whole network can be optimized by a joint loss in an end-to-end framework. We have carried out a series of comparative evaluations on two challenging representative datasets **UCF101-24** and **J-HMDB-21**. Our approach outperforms the other state-of-the-art results while retaining real-time capability, providing 34 frames-per-second on 16-frames input clips and 62 frames-per-second on 8-frames input clips.