arXiv:2411.03620stat.MLcs.LG2024-11被引 1

提出一种用于空间数据的分层神经网络回归方法,可高效建模非线性空间关系。

A Subsampling Based Neural Network for Spatial Data

  • 基于分层采样构建局部化两层神经网络,适配空间数据特性。
  • 理论证明在固定采样设计下模型具有一致性,收敛速度优于已有方法。
  • 适用于城市气温预测等非线性空间回归任务,尤其对光滑度较低表面更优。

深度神经网络在地理空间数据中的应用已成为当前研究热点。已有大量统计研究涉及广义最小二乘优化、引入基函数到神经网络输入节点等方法。然而,针对格点数据,尚无文献探讨神经网络在回归中基于渐近分析的应用。本文提出一种一致性的局部化两层深度神经网络回归方法,适用于有界与无界空间域,在固定采样设计的混合递增空间区域下证明其一致性。理论表明,该模型的渐近收敛速度优于 extcite{zhan2024neural} 的神经网络,并改进了 extcite{shen2023asymptotic} 的结构。我们通过观测真实与预测数据的经验概率分布之间的偏差度量收敛速率,发现当空间表面越不光滑时,收敛越快。将该渐近分析应用于美国主要城市月平均气温的卫星图像估计,展示了非线性空间回归的有效性。同时在多种场景下使用模拟格点数据验证方法性能。

原文摘要 · Abstract (English)

The application of deep neural networks in geospatial data has become a trending research problem in the present day. A significant amount of statistical research has already been introduced, such as generalized least square optimization by incorporating spatial variance-covariance matrix, considering basis functions in the input nodes of the neural networks, and so on. However, for lattice data, there is no available literature about the utilization of asymptotic analysis of neural networks in regression for spatial data. This article proposes a consistent localized two-layer deep neural network-based regression for spatial data. We have proved the consistency of this deep neural network for bounded and unbounded spatial domains under a fixed sampling design of mixed-increasing spatial regions. We have proved that its asymptotic convergence rate is faster than that of \cite{zhan2024neural}'s neural network and an improved generalization of \cite{shen2023asymptotic}'s neural network structure. We empirically observe the rate of convergence of discrepancy measures between the empirical probability distribution of observed and predicted data, which will become faster for a less smooth spatial surface. We have applied our asymptotic analysis of deep neural networks to the estimation of the monthly average temperature of major cities in the USA from its satellite image. This application is an effective showcase of non-linear spatial regression. We demonstrate our methodology with simulated lattice data in various scenarios.

空间回归神经网络渐近分析气象预测

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