Test-Time Adaptation in Point Clouds: Leveraging Sampling Variation with Weight Averaging

Ali Bahri; Moslem Yazdanpanah; Mehrdad Noori; Sahar Dastani; Milad Cheraghalikhani; David Osowiech; Farzad Beizaee; Gustavo adolfo. vargas-hakim; Ismail Ben Ayed; Christian Desrosiers

arXiv · 2411.01116

Test-Time Adaptation in Point Clouds: Leveraging Sampling Variation with Weight Averaging

Ali Bahri·Moslem Yazdanpanah·Mehrdad Noori·Sahar Dastani·Milad Cheraghalikhani·David Osowiech·Farzad Beizaee·Gustavo adolfo. vargas-hakim·Ismail Ben Ayed·Christian Desrosiers

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Abstract

Test-Time Adaptation (TTA) addresses distribution shifts during testing by adapting a pretrained model without access to source data. In this work, we propose a novel TTA approach for 3D point cloud classification, combining sampling variation with weight averaging. Our method leverages Farthest Point Sampling (FPS) and K-Nearest Neighbors (KNN) to create multiple point cloud representations, adapting the model for each variation using the TENT algorithm. The final model parameters are obtained by averaging the adapted weights, leading to improved robustness against distribution shifts. Extensive experiments on ModelNet40-C, ShapeNet-C, and ScanObjectNN-C datasets, with different backbones (Point-MAE, PointNet, DGCNN), demonstrate that our approach consistently outperforms existing methods while maintaining minimal resource overhead. The proposed method effectively enhances model generalization and stability in challenging real-world conditions.

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Ali Bahri, Moslem Yazdanpanah, Mehrdad Noori, Sahar Dastani, Milad Cheraghalikhani, David Osowiech, Farzad Beizaee, Gustavo adolfo. vargas-hakim, Ismail Ben Ayed, Christian Desrosiers. 2024-12-30. Test-Time Adaptation in Point Clouds: Leveraging Sampling Variation with Weight Averaging. https://arxiv.org/abs/2411.01116

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