Penalized Network Cross-Validation for Nested Models by Edge-Sampling
基于边抽样的嵌套网络模型惩罚交叉验证AI 解读 ↓
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基于边抽样的嵌套网络模型惩罚交叉验证AI 解读 ↓
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In the network literature, a wide range of statistical models has been proposed to exploit structural patterns in the data. Therefore, model selection between different models is a fundamental problem. However, systematic theoretical understanding remains limited when comparisons involve different model classes. To address this challenging issue, we propose a penalized edge-sampling cross-validation framework for nested network model selection. By incorporating a model complexity penalty into the evaluation process, our method effectively mitigates the overfitting tendency of cross-validation and adapts to varying model structures. This framework supports comparisons among widely used models, including stochastic block models (SBMs), degree-corrected SBMs (DCBMs), and graphon models, providing the first consistency guarantees for model selection across these settings to the best of our knowledge. Empirical evaluations, including both simulated data and the “Political Books” network, demonstrate that our method yields stable and accurate performance across various scenarios.