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arXiv 1806.04542stat.MLcs.LG
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Wasserstein梯度流近似推理

Approximate inference with Wasserstein gradient flows

Massachusetts Institute of Technology(麻省理工学院)

Charlie Frogner, Tomaso Poggio

摘要:

我们提出了一种新的近似推理方法的扩散过程的基础上,Wasserstein梯度流公式的扩散。在这个公式中,随时间变化的扩散密度被导出为遵循特定自由能泛函的梯度的隐式欧拉步骤的极限。现有的Wasserstein梯度流计算方法依赖于离散化的扩散域,禁止其应用领域在几个维度以上。相反,我们提出了一种无离散化的推理方法,直接在连续函数空间中计算Wasserstein梯度流。我们表征所提出的方法的近似特性,并评估它的非线性过滤任务,发现性能相当于最先进的过滤扩散。

英文摘要:

We present a novel approximate inference method for diffusion processes, based on the Wasserstein gradient flow formulation of the diffusion. In this formulation, the time-dependent density of the diffusion is derived as the limit of implicit Euler steps that follow the gradients of a particular free energy functional. Existing methods for computing Wasserstein gradient flows rely on discretization of the domain of the diffusion, prohibiting their application to domains in more than several dimensions. We propose instead a discretization-free inference method that computes the Wasserstein gradient flow directly in a space of continuous functions. We characterize approximation properties of the proposed method and evaluate it on a nonlinear filtering task, finding performance comparable to the state-of-the-art for filtering diffusions.

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