Toward a Neurosymbolic Understanding of Hidden Neuron Activations

Abstract

With the widespread adoption of deep learning techniques, the need for explainability and trustworthiness is increasingly critical, especially in safety-sensitive applications and for improved debugging, given the black-box nature of these models. The explainable AI (XAI) literature offers various helpful techniques; however, many approaches use a secondary deep learning-based model to explain the primary model’s decisions or require domain expertise to interpret the explanations. A relatively new approach involves explaining models using high-level, human-understandable concepts. While these methods have proven effective, an intriguing area of exploration lies in using a white-box technique to explain the probing model. We present a novel, model-agnostic, post hoc XAI method that provides meaningful interpretations for hidden neuron activations. Our approach leverages a Wikipedia-derived concept hierarchy, encompassing approximately 2 million classes as background knowledge, and uses deductive reasoning-based concept induction to generate explanations. Our method demonstrates competitive performance across various evaluation metrics, including statistical evaluation, concept activation analysis, and benchmarking against contemporary methods. Additionally, a specialized study with large language models (LLMs) highlights how LLMs can serve as explainers in a manner similar to our method, showing comparable performance with some trade-offs. Furthermore, we have developed a tool called ConceptLens, enabling users to test custom images and obtain explanations for model decisions. Finally, we introduce an entirely reproducible, end-to-end system that simplifies the process of replicating our system and results.

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