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3D object detection plays an important role in autonomous driving and other robotics applications. However, these detectors usually require training on large amounts of annotated data that is expensive and time-consuming to collect. Instead, we propose leveraging large amounts of unlabeled point cloud videos by semi-supervised learning of 3D object detectors via temporal graph neural networks. Our insight is that temporal smoothing can create more accurate detection results on unlabeled data, and these smoothed detections can then be used to retrain the detector. We learn to perform this temporal reasoning with a graph neural network, where edges represent the relationship between candidate detections in different time frames.more » « less
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Wang, Jianren ; Ancha, Siddharth ; Chen, Yi-Ting ; Held, David ( , Proceedings of the IEEERSJ International Conference on Intelligent Robots and Systems)null (Ed.)3D object trackers usually require training on large amounts of annotated data that is expensive and time-consuming to collect. Instead, we propose leveraging vast unlabeled datasets by self-supervised metric learning of 3D object trackers, with a focus on data association. Large scale annotations for unlabeled data are cheaply obtained by automatic object detection and association across frames. We show how these self-supervised annotations can be used in a principled manner to learn point-cloud embeddings that are effective for 3D tracking. We estimate and incorporate uncertainty in self-supervised tracking to learn more robust embeddings, without needing any labeled data. We design embeddings to differentiate objects across frames, and learn them using uncertainty-aware self-supervised training. Finally, we demonstrate their ability to perform accurate data association across frames, towards effective and accurate 3D tracking.more » « less
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Dasari, Sudeep ; Wang, Jianren ; Hong, Joyce ; Bahl, Shikhar ; Lin, Yixin ; Wang, Austin S ; Thankaraj, Abitha ; Singh Chahal, Karanbir ; Calli, Berk ; Gupta, Saurabh ; et al ( , NeurIPS 2021 Datasets and Benchmarks Track)