一句话:提出基于符号逻辑的可解释性语义与计算理论,从决策的必要/充分条件刻画解释。
该教程关注理解(学习得到的)分类器决策这一可解释 AI 核心问题。论文沿三个维度组织:刻画对决策必要且充分的条件,以给出可视为“决策理由”的实例抽象;刻画对决策充分的最小条件,以识别与决策无关的实例方面;刻画对决策必要的最小条件,以识别导致替代决策的最小扰动。作者基于符号逻辑的近期进展,给出一个综合的、语义与计算层面的可解释性理论,并讨论该理论如何特别适用于贝叶斯网络、决策树、随机森林以及某些类型的神经网络等非符号分类器。
A central quest in explainable AI relates to understanding the decisions made by (learned) classifiers. There are three dimensions of this understanding that have been receiving significant attention in recent years. The first dimension relates to characterizing conditions on instances that are necessary and sufficient for decisions, therefore providing abstractions of instances that can be viewed as the "reasons behind decisions." The next dimension relates to characterizing minimal conditions that are sufficient for a decision, therefore identifying aspects of the instance that are irrelevant to the decision. The last dimension relates to characterizing minimal conditions that are necessary for a decision, therefore identifying minimal perturbations to the instance that yield alternate decisions. We will discuss in this tutorial a comprehensive, semantical and computational theory of explainability along these dimensions which is based on some recent developments in symbolic logic. The tutorial will also discuss how this theory is particularly applicable to non-symbolic classifiers such as those based on Bayesian networks, decision trees, random forests and some types of neural networks.