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AI 根据所提供的论文材料归类:摘要直接研究因果结构的不确定性及贝叶斯因果图后验学习,对应因果推断中的因果发现。

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关注这篇论文的作者
Anish Dhir
Matthew Ashman
James Requeima
Mark van der Wilk

贝叶斯因果发现的元学习方法

研究问题
在因果结构不唯一且样本有限时,如何近似整个因果图后验分布,并保留边之间的相关性、节点置换等变性和抽样能力?
方法与思路
作者提出贝叶斯元学习模型,直接学习因果结构后验,使模型能够抽取因果图样本,并编码边相关性及节点置换等变性。
材料陈述的贡献
摘要称,该方法克服部分既有元学习方法难以表示完整后验及可靠抽样的局限,与已有贝叶斯因果发现方法比较展示了优势。
阅读关注点
应核对元训练任务及先验设定、后验近似的评价标准、边相关性和置换性质的实现,以及抽样结果的校准与跨任务泛化。
阅读边界
这是 arXiv 预印本,同行评审及期刊接收未核实;摘要未说明识别假设、后验误差或比较数值,能够抽样不等于后验已准确校准。

原文摘要

Discovering a unique causal structure is difficult due to both inherent identifiability issues, and the consequences of finite data. As such, uncertainty over causal structures, such as those obtained from a Bayesian posterior, are often necessary for downstream tasks. Finding an accurate approximation to this posterior is challenging, due to the large number of possible causal graphs, as well as the difficulty in the subproblem of finding posteriors over the functional relationships of the causal edges. Recent works have used meta-learning to view the problem of estimating the maximum a-posteriori causal graph as supervised learning. Yet, these methods are limited when estimating the full posterior as they fail to encode key properties of the posterior, such as correlation between edges and permutation equivariance with respect to nodes. Further, these methods also cannot reliably sample from the posterior over causal structures. To address these limitations, we propose a Bayesian meta learning model that allows for sampling causal structures from the posterior and encodes these key properties. We compare our meta-Bayesian causal discovery against existing Bayesian causal discovery methods, demonstrating the advantages of directly learning a posterior over causal structure.

笔记与分组
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