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TRUST XAI:AI的模型无关性说明及IIoT安全性案例研究

TRUST XAI: Model-Agnostic Explanations for AI With a Case Study on IIoT Security

Washington University(华盛顿大学);Qatar University(卡塔尔大学)

Maede Zolanvari, Zebo Yang, Khaled Khan, Raj Jain, Nader Meskin

摘要:

尽管人工智能有了显著的增长,但其“黑匣子”性质在产生足够的信任方面带来了挑战。因此,它很少被用作物联网高风险应用中的独立单元,例如关键工业基础设施,医疗系统和金融应用等。然而,设计适当快速和准确的XAI仍然具有挑战性,特别是在数值应用中。在这里,我们提出了一个通用的XAI模型,称为依赖于统计理论的透明度(TRUST),它是模型不可知的,高性能的,适合于数值应用。简而言之,TRUST XAI在基于AI的系统中对AI输出的统计行为进行建模。因子分析用于将输入特征转换为一组新的潜变量。我们使用互信息来对这些变量进行排名,只选择对AI输出最有影响力的变量,并将它们称为类的“代表”。然后,我们使用多模态高斯分布来确定任何新样本属于每个类别的可能性。我们使用三种不同的网络安全数据集,在工业物联网(IIoT)的网络安全案例研究中展示了TRUST的有效性。IIoT是处理数值数据的重要应用。结果表明,TRUST XAI为新的随机样本提供了解释,平均成功率为98%。与流行的XAI模型LIME相比,TRUST在性能、速度和可解释性方法方面表现出优越性。最后,我们还展示了如何向用户解释信任。

英文摘要:

Despite AI's significant growth, its "black box" nature creates challenges in generating adequate trust. Thus, it is seldom utilized as a standalone unit in IoT high-risk applications, such as critical industrial infrastructures, medical systems, and financial applications, etc. Explainable AI (XAI) has emerged to help with this problem. However, designing appropriately fast and accurate XAI is still challenging, especially in numerical applications. Here, we propose a universal XAI model named Transparency Relying Upon Statistical Theory (TRUST), which is model-agnostic, high-performing, and suitable for numerical applications. Simply put, TRUST XAI models the statistical behavior of the AI's outputs in an AI-based system. Factor analysis is used to transform the input features into a new set of latent variables. We use mutual information to rank these variables and pick only the most influential ones on the AI's outputs and call them "representatives" of the classes. Then we use multi-modal Gaussian distributions to determine the likelihood of any new sample belonging to each class. We demonstrate the effectiveness of TRUST in a case study on cybersecurity of the industrial Internet of things (IIoT) using three different cybersecurity datasets. As IIoT is a prominent application that deals with numerical data. The results show that TRUST XAI provides explanations for new random samples with an average success rate of 98%. Compared with LIME, a popular XAI model, TRUST is shown to be superior in the context of performance, speed, and the method of explainability. In the end, we also show how TRUST is explained to the user.

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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