A Proof-of-Concept for Auditable Attention Using Ultrametric Tree Distances
The dominance of high-dimensional Euclidean vector spaces in contemporary transformer architectures has precipitated an interpretability crisis, as continuous geometric embeddings can obscure the causal mechanisms of semantic attention. This paper presents a formal proof-of-concept for a structurally rigid ultrametric attention mechanism, utilizing a binary-tree proxy encoder to deterministically map tokens into a hierarchical space. A computational simulation deploying a ten-token synthetic vocabulary demonstrates that our ultrametric LCA matrix deterministically initializes a state that reflects semantic hierarchy, in contrast to the arbitrary semantic associations generated by baseline Euclidean random initializations. While this study is limited to a proof-of-concept and does not include task-based performance metrics, it directly addresses a pathway toward structural AI safety. It proves that topological constraints can be integrated into a differentiable attention layer, providing a necessary framework for regulatory auditing and establishing the classical state-space foundation for future quantum-walk sequence architectures.