arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.04604cs.CVcs.LG
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SoftFlow:流形上流规范化的概率框架

SoftFlow: Probabilistic Framework for Normalizing Flow on Manifolds

Seoul National University(首尔国立大学)

Hyeongju Kim, Hyeonseung Lee, Woo Hyun Kang, Joun Yeop Lee, Nam Soo Kim

摘要:

基于流的生成模型由两个相同维度的随机变量之间的可逆变换组成。因此,如果数据分布的维度与底层目标分布的维度不匹配,则无法充分训练基于流的模型。在本文中,我们提出了SoftFlow,一个概率框架,用于训练流形上的规范化流。为了避免维度不匹配问题,SoftFlow估计扰动输入数据的条件分布,而不是直接学习数据分布。我们的实验表明,SoftFlow可以捕获的流形数据的固有结构,并生成高质量的样本,不同于传统的基于流的模型。此外,我们将所提出的框架应用于3D点云,以减轻基于流的模型形成薄结构的困难。所提出的3D点云模型,即SoftPointFlow,可以更准确地估计各种形状的分布,并在点云生成方面达到最先进的性能。

英文摘要:

Flow-based generative models are composed of invertible transformations between two random variables of the same dimension. Therefore, flow-based models cannot be adequately trained if the dimension of the data distribution does not match that of the underlying target distribution. In this paper, we propose SoftFlow, a probabilistic framework for training normalizing flows on manifolds. To sidestep the dimension mismatch problem, SoftFlow estimates a conditional distribution of the perturbed input data instead of learning the data distribution directly. We experimentally show that SoftFlow can capture the innate structure of the manifold data and generate high-quality samples unlike the conventional flow-based models. Furthermore, we apply the proposed framework to 3D point clouds to alleviate the difficulty of forming thin structures for flow-based models. The proposed model for 3D point clouds, namely SoftPointFlow, can estimate the distribution of various shapes more accurately and achieves state-of-the-art performance in point cloud generation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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