提出可解释的反事实生成框架,让模型决策更透明且可操作。
MC3G: Model Agnostic Causally Constrained Counterfactual Generation
- 用规则模型替代黑箱,实现对任意模型的反事实生成。
- 生成的反事实推荐更可行,且所需改动成本更低。
- 仅计算用户主动改变的代价,更真实反映实际努力程度。
机器学习模型在金融、法律和招聘等高风险场景中日益影响决策,推动对透明、可解释结果的需求。然而,现有可解释方法可能暴露底层专有算法,这对从业者不利。因此,需在透明度与提供可行动的改进建议之间取得平衡。反事实解释可通过展示输入变化如何带来有利预测来解决此问题。本文提出模型无关的因果约束反事实生成框架(MC3G),克服现有方法局限:首先,MC3G通过可解释的规则代理模型近似任意黑箱模型;其次,利用该代理生成能为原模型带来有利结果的反事实;第三,通过排除因因果依赖自动发生的变化带来的“努力”成本,仅计算用户主动修改的代价,使努力评估更现实、公平。实验表明,相比现有方法,MC3G生成的反事实更具可解释性与可操作性,同时成本更低。研究凸显了其在提升决策透明度、问责性与实用性方面的潜力。
原文摘要 · Abstract (English)
Machine learning models increasingly influence decisions in high-stakes settings such as finance, law and hiring, driving the need for transparent, interpretable outcomes. However, while explainable approaches can help understand the decisions being made, they may inadvertently reveal the underlying proprietary algorithm: an undesirable outcome for many practitioners. Consequently, it is crucial to balance meaningful transparency with a form of recourse that clarifies why a decision was made and offers actionable steps following which a favorable outcome can be obtained. Counterfactual explanations offer a powerful mechanism to address this need by showing how specific input changes lead to a more favorable prediction. We propose Model-Agnostic Causally Constrained Counterfactual Generation (MC3G), a novel framework that tackles limitations in the existing counterfactual methods. First, MC3G is model-agnostic: it approximates any black-box model using an explainable rule-based surrogate model. Second, this surrogate is used to generate counterfactuals that produce a favourable outcome for the original underlying black box model. Third, MC3G refines cost computation by excluding the ``effort" associated with feature changes that occur automatically due to causal dependencies. By focusing only on user-initiated changes, MC3G provides a more realistic and fair representation of the effort needed to achieve a favourable outcome. We show that MC3G delivers more interpretable and actionable counterfactual recommendations compared to existing techniques all while having a lower cost. Our findings highlight MC3G's potential to enhance transparency, accountability, and practical utility in decision-making processes that incorporate machine-learning approaches.
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