By building up on the recent theory that established the connection between implicit generative modeling and optimal transport, in this study, we propose a novel parameter-free algorithm for learning the underlying distributions of complicated datasets and sampling from them. The proposed algorithm is based on a functional optimization problem, which aims at finding a measure that is close to the data distribution as much as possible and also expressive enough for generative modeling purposes. We formulate the problem as a gradient flow in the space of probability measures. The connections between gradient flows and stochastic differential equations let us develop a computationally efficient algorithm for solving the optimization problem, where the resulting algorithm resembles the recent dynamics-based Markov Chain Monte Carlo algorithms. We provide formal theoretical analysis where we prove finite-time error guarantees for the proposed algorithm. Our experimental results support our theory and shows that our algorithm is able to capture the structure of challenging distributions.

本研究提出了一种基于梯度流的、无需参数的算法，用于学习复杂数据集的潜在分布和从中进行抽样。该算法是建立在隐式生成建模 (IGM) 与最优输运之间的联系理论基础上，并通过泛函优化问题的方式得以实现。通过梯度流和随机微分方程的联系，该算法既能高效地解决优化问题，还提供了理论分析和有限时间误差保证。实验结果表明，该算法能够成功地捕捉不同类型的数据分布结构。

切片-瓦瑟斯坦流：通过最优输运和扩散的非参数生成建模