Previous studies on the built environment and urban vitality often assume that they follow a pre-defined (mostly linear in parameters) relationship, and few studies substantiate whether high-quality transit (T) and supportive land development (D) are synergistic to vibrant urban places. This study employs gradient boosting decision trees to examine the irregularly non-linear associations between the built environment and urban vitality, using Shenzhen as the case study and the Baidu Heat Index as a proxy for vitality. It reveals that their associations change drastically past some thresholds of built environment attributes, and that there are non-linear synergies between T and D. The findings provide guidance for neighborhood planning and have implications for cities that seek transit investments and transit-oriented development.

先前对建筑环境和城市活力的研究通常假定它们遵循预先定义的（参数大多为线性）关系，很少有研究证实高质量的公交（T）和辅助性土地开发（D）是否与生机勃勃的城市协同作用。的地方。本研究采用梯度增强决策树，以深圳为例，以百度供热指数为指标，考察了建筑环境与城市活力之间的不规则非线性关系。它揭示了它们的关联在建筑环境属性的某些阈值之上发生了巨大变化，并且T和D之间存在非线性协同作用。这些发现为邻里规划提供了指导，并对寻求公交投资和公交导向发展的城市产生了影响。