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AI 根据所提供的论文材料归类:摘要研究结构因果模型之间的抽象关系和从观测数据进行因果发现。

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关注这篇论文的作者
Riccardo Massidda
Sara Magliacane
Davide Bacciu

学习线性结构因果模型的因果抽象

研究问题
不同粒度的线性结构因果模型何时能够通过线性映射形成因果抽象,能否从观测数据共同学习两层模型及其抽象关系?
方法与思路
作者刻画低层系数、抽象映射和高层系数的关系,并提出 Abs-LiNGAM,在非高斯噪声假设下利用高层约束加速低层发现。
材料陈述的贡献
摘要称,研究给出系数和因果排序之间的约束,并在模拟中展示从数据学习因果抽象的可行性及改善因果发现扩展性的潜力。
阅读关注点
应核对因果抽象如何保持干预含义、映射及两层模型的可识别性,以及非高斯噪声假设和高层估计误差如何影响低层恢复。
阅读边界
这是 arXiv 预印本,不能据此确认同行评审或期刊接收。摘要仅涉及线性模型与线性抽象,未说明完整假设或现实数据表现。

原文摘要

The need for modelling causal knowledge at different levels of granularity arises in several settings. Causal Abstraction provides a framework for formalizing this problem by relating two Structural Causal Models at different levels of detail. Despite increasing interest in applying causal abstraction, e.g. in the interpretability of large machine learning models, the graphical and parametrical conditions under which a causal model can abstract another are not known. Furthermore, learning causal abstractions from data is still an open problem. In this work, we tackle both issues for linear causal models with linear abstraction functions. First, we characterize how the low-level coefficients and the abstraction function determine the high-level coefficients and how the high-level model constrains the causal ordering of low-level variables. Then, we apply our theoretical results to learn high-level and low-level causal models and their abstraction function from observational data. In particular, we introduce Abs-LiNGAM, a method that leverages the constraints induced by the learned high-level model and the abstraction function to speedup the recovery of the larger low-level model, under the assumption of non-Gaussian noise terms. In simulated settings, we show the effectiveness of learning causal abstractions from data and the potential of our method in improving scalability of causal discovery.

笔记与分组
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