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arXiv 2202.11286cs.LGstat.ME
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潜在混杂下Granger因果关系的深度递归模型

Deep Recurrent Modelling of Granger Causality with Latent Confounding

University College London(伦敦大学学院)

Zexuan Yin, Paolo Barucca

摘要:

当无法进行干预时,推断观测时间序列数据中的因果关系是一项重要任务。Granger因果关系是一个流行的框架来推断不同时间序列之间的潜在因果机制。格兰杰因果关系的原始定义仅限于线性过程,并在存在潜在混淆因素的情况下导致虚假结论。在这项工作中,我们利用递归神经网络的表达能力,并提出了一种基于深度学习的方法,通过直接考虑潜在的混杂因素来建模非线性格兰杰因果关系。我们的方法利用多个递归神经网络来参数化预测分布,并且我们提出了使用双解码器设置来进行Granger测试的新方法。我们展示了非线性随机时间序列的模型性能,其中潜在的混淆因素影响不同时滞的因果关系;结果显示了我们的模型与现有基准相比的有效性。

英文摘要:

Inferring causal relationships in observational time series data is an important task when interventions cannot be performed. Granger causality is a popular framework to infer potential causal mechanisms between different time series. The original definition of Granger causality is restricted to linear processes and leads to spurious conclusions in the presence of a latent confounder. In this work, we harness the expressive power of recurrent neural networks and propose a deep learning-based approach to model non-linear Granger causality by directly accounting for latent confounders. Our approach leverages multiple recurrent neural networks to parameterise predictive distributions and we propose the novel use of a dual-decoder setup to conduct the Granger tests. We demonstrate the model performance on non-linear stochastic time series for which the latent confounder influences the cause and effect with different time lags; results show the effectiveness of our model compared to existing benchmarks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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