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arXiv 2405.02810math.NAcs.NAstat.ML
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随机动力系统的自适应深度密度逼近

Adaptive deep density approximation for stochastic dynamical systems

Junjie He, Qifeng Liao, Xiaoliang Wan

AI总结:

本文针对随机动力系统提出时间KRnet(tKRnet)显式密度模型,结合自适应配点生成和时间分解技术高效逼近Liouville方程解的概率密度函数,缓解维数灾难并改善长时间积分。

摘要:

本文考虑随机动力系统的自适应深度神经网络逼近。基于与随机动力系统相关的Liouville方程,提出了一种新的时间KRnet(tKRnet)来逼近状态变量的概率密度函数(PDF)。tKRnet为Liouville方程的解提供了一个显式密度模型,缓解了限制传统基于网格数值方法应用的维数灾难问题。为了高效训练tKRnet,开发了一种自适应过程来为相应的残差损失函数生成配点,其中样本在每次迭代中使用近似密度函数迭代生成。还采用时间分解技术来改善长时间积分。提供了所提方法的理论分析,并给出了数值算例以展示其性能。

英文摘要:

In this paper we consider adaptive deep neural network approximation for stochastic dynamical systems. Based on the Liouville equation associated with the stochastic dynamical systems, a new temporal KRnet (tKRnet) is proposed to approximate the probability density functions (PDFs) of the state variables. The tKRnet gives an explicit density model for the solution of the Liouville equation, which alleviates the curse of dimensionality issue that limits the application of traditional grid based numerical methods. To efficiently train the tKRnet, an adaptive procedure is developed to generate collocation points for the corresponding residual loss function, where samples are generated iteratively using the approximate density function at each iteration. A temporal decomposition technique is also employed to improve the long-time integration. Theoretical analysis of our proposed method is provided, and numerical examples are presented to demonstrate its performance.

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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