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Temporally-Resolved Token Attribution Reveals the Generation Dynamics of Diffusion Language Models

2026-10-01 06:51:42
Darpan Aswal, C\'eline Hudelot
arXiv_AI
       
Abstract

This work presents Diffusion Layer Integrated Gradients (DLIG), a token attribution method for diffusion language models (DLMs) that extends Integrated Gradients (IG~\cite{sundararajan2017axiomatic}) to arbitrary layers and denoising steps. DLIG attributes a DLM's progressive commitment to a self-generated or fixed completion for an input prompt. We establish direct correspondences between DLIG and the IG axioms of completeness, implementation invariance, linearity, and symmetry preservation. As a lightweight complement to interventional analysis, DLIG provides an inexpensive first check of mechanistic hypotheses across the denoising trajectory. We demonstrate this on word-sense disambiguation, multi-hop graph reasoning, and sentence infilling, revealing how DLMs draw on inputs across positions, layers, and denoising steps.

Abstract (translated)

URL

https://arxiv.org/abs/2610.01177

PDF

https://arxiv.org/pdf/2610.01177.pdf

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