论文标题
Lipschitz在图表上学习的连续限制
Continuum Limit of Lipschitz Learning on Graphs
论文作者
论文摘要
近年来,通过基于图的方法来解决半监督的学习问题已成为一种趋势,因为图可以代表各种数据,并为研究连续限制(例如差分运算符)提供了合适的框架。这里流行的策略是$ p $ -laplacian学习,它在一组未标记的数据上为所寻求的推理功能带来了平滑度。对于$ p <\ infty $ continuum continuum限制,使用了$γ$ - convergence中的工具。对于$ p = \ infty $,称为Lipschitz学习,使用粘度解决方案的概念研究了相关无限拉普拉斯方程的连续限制。 在这项工作中,我们证明了使用$γ$ -Convergence学习Lipschitz学习的连续限制。特别是,我们定义了一系列功能序列,该功能近似于图形函数的最大本地Lipschitz常数,并证明$ l^\ infty $ topogy在梯度上的$ l^\ infty $ - convergence随着图形的范围的超级范围变得更加密集。此外,我们显示了功能的紧凑性,这意味着最小化器的收敛性。在我们的分析中,我们允许一组不同的标记数据,该数据收敛到Hausdorff距离的一般封闭设置。我们将结果应用于非线性接地状态,即具有约束$ l^p $ - 态的最小化器,作为副产品,证明了图距离函数与地球距离函数的收敛性。
Tackling semi-supervised learning problems with graph-based methods has become a trend in recent years since graphs can represent all kinds of data and provide a suitable framework for studying continuum limits, e.g., of differential operators. A popular strategy here is $p$-Laplacian learning, which poses a smoothness condition on the sought inference function on the set of unlabeled data. For $p<\infty$ continuum limits of this approach were studied using tools from $Γ$-convergence. For the case $p=\infty$, which is referred to as Lipschitz learning, continuum limits of the related infinity-Laplacian equation were studied using the concept of viscosity solutions. In this work, we prove continuum limits of Lipschitz learning using $Γ$-convergence. In particular, we define a sequence of functionals which approximate the largest local Lipschitz constant of a graph function and prove $Γ$-convergence in the $L^\infty$-topology to the supremum norm of the gradient as the graph becomes denser. Furthermore, we show compactness of the functionals which implies convergence of minimizers. In our analysis we allow a varying set of labeled data which converges to a general closed set in the Hausdorff distance. We apply our results to nonlinear ground states, i.e., minimizers with constrained $L^p$-norm, and, as a by-product, prove convergence of graph distance functions to geodesic distance functions.