Generative-Contrastive Learning for Self-Supervised Latent Representations of 3D Shapes from Multi-Modal Euclidean Input

• URL: http://arxiv.org/abs/2301.04612v1
• Date: Wed, 11 Jan 2023 18:14:24 GMT
• Title: Generative-Contrastive Learning for Self-Supervised Latent Representations of 3D Shapes from Multi-Modal Euclidean Input
• Authors: Chengzhi Wu, Julius Pfrommer, Mingyuan Zhou and J\"urgen Beyerer
• Abstract summary: We propose a combined generative and contrastive neural architecture for learning latent representations of 3D shapes. The architecture uses two encoder branches for voxel grids and multi-view images from the same underlying shape.
• Score: 44.10761155817833
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a combined generative and contrastive neural architecture for learning latent representations of 3D volumetric shapes. The architecture uses two encoder branches for voxel grids and multi-view images from the same underlying shape. The main idea is to combine a contrastive loss between the resulting latent representations with an additional reconstruction loss. That helps to avoid collapsing the latent representations as a trivial solution for minimizing the contrastive loss. A novel switching scheme is used to cross-train two encoders with a shared decoder. The switching scheme also enables the stop gradient operation on a random branch. Further classification experiments show that the latent representations learned with our self-supervised method integrate more useful information from the additional input data implicitly, thus leading to better reconstruction and classification performance.

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