MarkTechPost@AI 2024年12月02日
Reimagining Paradigms for Interpretability in Artificial Intelligence
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人工智能模型的可解释性是确保其可靠性和信任度的关键,但现有方法(内在可解释性和事后可解释性)存在局限性,难以满足高风险场景的需求。本文介绍了三种新兴范式:学习忠实解释、可测量忠实性模型和自解释模型,旨在实现模型预测与解释的一致性,从而提升人工智能系统的可靠性。这些新范式通过优化预测模型和解释方法、构建可测量忠实性的模型以及将推理过程集成到模型中,有效地克服了传统方法的缺陷。研究表明,这些新范式在提升模型忠实性和可解释性方面取得了显著成果,为构建更安全可靠的人工智能系统提供了新的思路。

🤔**现有可解释性范式存在局限性:**内在可解释性模型(如决策树)泛化能力和性能受限,而事后可解释性方法(如梯度重要性)解释与模型逻辑不一致,可靠性有限,且泛化能力差。

💡**学习忠实解释范式:**通过联合优化预测模型和解释方法,确保解释与模型推理逻辑的一致性,提升了模型忠实度。

📊**可测量忠实性模型范式:**将忠实性度量纳入模型设计,确保解释生成不会影响模型结构灵活性,并保证解释的可靠性。

🤖**自解释模型范式:**将推理过程集成到模型中,实现预测和解释的同步生成,适用于实时应用,但需进一步提升解释的可靠性和一致性。

Ensuring AI models provide faithful and reliable explanations of their decision-making processes is still challenging. Faithfulness in the sense of explanations faithfully representing the underlying logic of a model prevents false confidence in AI systems, which is critical for healthcare, finance, and policymaking. Existing paradigms for interpretability—intrinsic (focused on inherently interpretable models) and post-hoc (providing explanations for pre-trained black-box models)—struggle to address these needs effectively. These fail to meet the current needs. This shortfall confines the use of AI to high-stakes scenarios, making it an urgent requirement to have innovative solutions.

Intrinsic approaches revolve around models such as decision trees or neural networks with restricted architectures that offer interpretability as a byproduct of their design. However, these models often fail in general applicability and competitive performance. In addition, many only partially achieve interpretability, with core components such as dense or recurrent layers remaining opaque. In contrast, post-hoc approaches generate explanations for pre-trained models using gradient-based importance measures or feature attribution techniques. While these methods are more flexible, their explanations frequently fail to align with the model’s logic, resulting in inconsistency and limited reliability. Additionally, post-hoc methods often depend heavily on specific tasks and datasets, making them less generalizable. These limitations highlight the critical need for a reimagined framework that balances faithfulness, generality, and performance.

To address these gaps, researchers have introduced three groundbreaking paradigms for achieving faithful and interpretable models. The first, Learn-to-Faithfully-Explain, focuses on optimizing predictive models alongside explanation methods to ensure alignment with the model’s reasoning. The direction of improving faithfulness using optimization techniques – that is, joint or disjoint training, and second, Faithfulness-Measurable Models: This mechanism puts the means to measure explanation fidelity into the design for the model. Through such an approach, optimal explanation generation could be undertaken with the assurance that doing so would not impair a model’s structural flexibility. Finally, Self-Explaining Models generate predictions and explanations simultaneously, integrating reasoning processes into the model. While promising for real-time applications, this paradigm should be further refined to ensure explanations are reliable and consistent across runs. These innovations bring about a shift of interest from external explanation techniques towards systems that are inherently interpretable and trustworthy.

These approaches will be evaluated on synthetic datasets and real-world datasets where faithfulness and interpretability will be of great emphasis. Such optimization methods make use of Joint Amortized Explanation Models (JAMs) to get model predictions to align with explanatory accuracy. However, prevention mechanisms for explanation mechanisms must be used in order not to overfit any specific predictions. These frameworks ensure scalability and robustness for a wide array of usage by incorporating models such as GPT-2 and RoBERTa. Several practical challenges, including robustness to out-of-distribution data and minimizing computational overhead, will be balanced with interpretability and performance. These refinement steps form a pathway towards more transparent and reliable AI systems.

We find that this approach brings significant improvements toward faithful explanation without sacrificing prediction performance. The Learn-to-Faithfully-Explain paradigm improves faithfulness metrics by 15% over standard benchmarks, and Faithfulness-Measurable Models give robust and quantified explanations along with high accuracy. Self-explaining models hold promise for more intuitive and real-time interpretations but need further work toward reliability in their outputs. Taken collectively, these results establish that these new frameworks are both practical and well-suited for overcoming the critical shortcomings of present-day interpretability 

This work introduces new paradigms that address the deficiencies of intrinsic and post-hoc paradigms for interpreting the output of complex systems in a transformative way. The focus is on faithfulness and reliability as guiding principles for developing safer and more trustworthy AI systems. In bridging the gap between interpretability and performance, these frameworks promise great progress in real-world applications. Future work should further develop these models to be scalable and impactful across various domains.


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人工智能 可解释性 模型解释 忠实性 AI安全
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