arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2106.06219math.NAcs.NA
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深度里兹方法的Robin预训练

Robin Pre-Training for the Deep Ritz Method

Luca Courte, Marius Zeinhofer

摘要:

我们比较了不同的训练策略的深Ritz方法的椭圆型方程的Dirichlet边界条件和突出的问题所产生的边界值。我们区分边界值的精确分辨率通过引入距离函数和近似通过罗宾边值问题。然而,距离函数是很难获得复杂的域。因此,求解近似于Dirichlet边值问题的Robin边值问题是更可行的,但是对于大的惩罚,这个问题的简单方法变得不稳定。提出了一种新的方法来补偿这个问题,在对目标惩罚强度进行主训练之前,使用较小的惩罚强度对模型进行预训练。我们提出的数值和理论证据表明,该方法是有益的。

英文摘要:

We compare different training strategies for the Deep Ritz Method for elliptic equations with Dirichlet boundary conditions and highlight the problems arising from the boundary values. We distinguish between an exact resolution of the boundary values by introducing a distance function and the approximation through a Robin Boundary Value problem. However, distance functions are difficult to obtain for complex domains. Therefore, it is more feasible to solve a Robin Boundary Value problem which approximates the solution to the Dirichlet Boundary Value problem, yet the naïve approach to this problem becomes unstable for large penalizations. A novel method to compensate this problem is proposed using a small penalization strength to pre-train the model before the main training on the target penalization strength is conducted. We present numerical and theoretical evidence that the proposed method is beneficial.

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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