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分类依据与纠错

AI 根据所提供的论文材料归类:摘要明确研究双变量因果方向识别、函数因果模型与因果发现算法,直接对应因果推断。

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关注这篇论文的作者
Ruibo Tu
Kun Zhang
Hedvig Kjellström
Cheng Zhang

用于因果发现的最优传输方法

研究问题
如何从两个变量的静态观测数据中判断因果方向,并通过最优传输的动力系统解释,降低方法对具体模型选择的敏感性?
方法与思路
作者连接函数因果模型与受约束最优传输,将加性噪声模型解释为保体积无压力流,并以速度场散度构造方向判据。
材料陈述的贡献
摘要提出最优传输因果发现框架及加性噪声算法,并扩展至后非线性模型;作者称其在合成与基准数据上表现领先。
阅读关注点
应核对方向可识别的模型限制、动力解释与散度判据的推导、传输估计方法,以及所谓模型稳健性和基准比较范围。
阅读边界
这是 arXiv 预印本,同行评审及期刊接收未核实;摘要未说明混杂处理和完整识别条件,领先表现不能视为普遍结论。

原文摘要

To determine causal relationships between two variables, approaches based on Functional Causal Models (FCMs) have been proposed by properly restricting model classes; however, the performance is sensitive to the model assumptions, which makes it difficult to use. In this paper, we provide a novel dynamical-system view of FCMs and propose a new framework for identifying causal direction in the bivariate case. We first show the connection between FCMs and optimal transport, and then study optimal transport under the constraints of FCMs. Furthermore, by exploiting the dynamical interpretation of optimal transport under the FCM constraints, we determine the corresponding underlying dynamical process of the static cause-effect pair data. It provides a new dimension for describing static causal discovery tasks while enjoying more freedom for modeling the quantitative causal influences. In particular, we show that Additive Noise Models (ANMs) correspond to volume-preserving pressureless flows. Consequently, based on their velocity field divergence, we introduce a criterion for determining causal direction. With this criterion, we propose a novel optimal transport-based algorithm for ANMs which is robust to the choice of models and extend it to post-nonlinear models. Our method demonstrated state-of-the-art results on both synthetic and causal discovery benchmark datasets.

笔记与分组
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