Nearest Neighbors Meet Deep Neural Networks for Point Cloud Analysis

• URL: http://arxiv.org/abs/2303.00703v1
• Date: Wed, 1 Mar 2023 17:57:09 GMT
• Title: Nearest Neighbors Meet Deep Neural Networks for Point Cloud Analysis
• Authors: Renrui Zhang, Liuhui Wang, Ziyu Guo, Jianbo Shi
• Abstract summary: We present an alternative to enhance existing deep neural networks without redesigning or extra parameters, termed as Spatial-Neighbor Adapter (SN-Adapter) Building on any trained 3D network, we utilize its learned encoding capability to extract features of the training dataset and summarize them as spatial knowledge. For a test point cloud, the SN-Adapter retrieves k nearest neighbors (k-NN) from the pre-constructed spatial prototypes and linearly interpolates the k-NN prediction with prototypical that of the original 3D network.
• Score: 14.844183458784235
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Performances on standard 3D point cloud benchmarks have plateaued, resulting in oversized models and complex network design to make a fractional improvement. We present an alternative to enhance existing deep neural networks without any redesigning or extra parameters, termed as Spatial-Neighbor Adapter (SN-Adapter). Building on any trained 3D network, we utilize its learned encoding capability to extract features of the training dataset and summarize them as prototypical spatial knowledge. For a test point cloud, the SN-Adapter retrieves k nearest neighbors (k-NN) from the pre-constructed spatial prototypes and linearly interpolates the k-NN prediction with that of the original 3D network. By providing complementary characteristics, the proposed SN-Adapter serves as a plug-and-play module to economically improve performance in a non-parametric manner. More importantly, our SN-Adapter can be effectively generalized to various 3D tasks, including shape classification, part segmentation, and 3D object detection, demonstrating its superiority and robustness. We hope our approach could show a new perspective for point cloud analysis and facilitate future research.

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