论文标题

神经贝叶斯网络研究

Neural Bayesian Network Understudy

论文作者

Rabaey, Paloma, De Boom, Cedric, Demeester, Thomas

论文摘要

贝叶斯网络由于包括因果知识而吸引了临床决策,但由于他们无法处理非结构化数据,他们的实际采用仍然有限。尽管神经网络没有这种限制,但它们却不可解释,并且本质上无法处理输入空间中的因果结构。我们的目标是建立结合两种方法优势的神经网络。这项工作是在训练此类神经网络的同时注入因果知识的观点的动机,在该方向上提出了初步步骤。我们演示了如何训练神经网络以输出条件概率,提供与贝叶斯网络大致相同的功能。此外,我们提出了两种训练策略,允许编码从给定的因果结构推断为神经网络的独立关系。我们在概念验证设置中介绍了初始结果,表明神经模型是对其贝叶斯网络对应物的研究,近似于其概率和因果关系。

Bayesian Networks may be appealing for clinical decision-making due to their inclusion of causal knowledge, but their practical adoption remains limited as a result of their inability to deal with unstructured data. While neural networks do not have this limitation, they are not interpretable and are inherently unable to deal with causal structure in the input space. Our goal is to build neural networks that combine the advantages of both approaches. Motivated by the perspective to inject causal knowledge while training such neural networks, this work presents initial steps in that direction. We demonstrate how a neural network can be trained to output conditional probabilities, providing approximately the same functionality as a Bayesian Network. Additionally, we propose two training strategies that allow encoding the independence relations inferred from a given causal structure into the neural network. We present initial results in a proof-of-concept setting, showing that the neural model acts as an understudy to its Bayesian Network counterpart, approximating its probabilistic and causal properties.

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