Computational and statistical thresholds in multi-layer stochastic block models
多层随机区块模型的计算与统计阈值AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接讨论多层网络的随机区块模型、社区恢复和检测,符合网络方向,但未涉及因果干扰效应。
多层随机区块模型的计算与统计阈值AI 解读 ↓
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We study the problem of community recovery and detection in multi-layer stochastic block models, focusing on the critical network density threshold for consistent community structure inference. Using a prototypical two-block model, we reveal a computational barrier for such multilayer stochastic block models that does not exist for its single-layer counterpart: When there are no computational constraints, the density threshold depends linearly on the number of layers. However, when restricted to polynomial-time algorithms, the density threshold scales with the square root of the number of layers, assuming correctness of a low-degree polynomial hardness conjecture. Our results provide a nearly complete picture of the optimal inference in multiple-layer stochastic block models and partially settle the open question in (J. Amer. Statist. Assoc. 118 (2023) 2433–2445) regarding the optimality of the bias-adjusted spectral method.