Bayesian model for FAD limit state

A Stan model file describing the GP regression for the limit state in an FAD. This can be run from R or Python using any of the compatible the Stan interface libraries provided the necessary inputs are provided (as documented in the data block of the Stan file).本文件为面向FAD中极限状态的高斯过程回归（Gaussian Process Regression）Stan模型文件。可通过R或Python语言，借助任意兼容的Stan接口库运行该模型，仅需按照该Stan模型文件数据块中的文档说明提供必要的输入参数。