Diffusion Integrated Gradients: Controllable Path Generation for Flexible Feature Attribution
For XAI practitioners, DiffIG offers flexible, inference-time controllable attributions, addressing the limitation of fixed or hand-crafted paths in existing methods.
Diffusion Integrated Gradients (DiffIG) reformulates path generation for feature attribution as a conditional generative modeling problem, using a diffusion model trained on Stick-Breaking Process paths and guided sampling. It matches or outperforms existing path-based methods, producing perceptually aligned explanations.
Path-based attribution methods such as Integrated Gradients (IG) are widely adopted for their strong axiomatic properties and effectiveness in attributing model predictions to input features by integrating gradients along a path from a baseline to the input. However, the choice of the attribution path largely affects the quality of explanations, and existing approaches rely on fixed or hand-crafted paths that often produce noisy or distorted attributions. To address this limitation, we propose Diffusion Integrated Gradients (DiffIG), a novel method that reformulates path generation as a conditional generative modeling problem. DiffIG first trains a diffusion model to learn a distribution over paths generated from a Stick-Breaking Process, then employs guided sampling to embed user guidance during the sampling procedure. We demonstrate that DiffIG quantitatively matches or outperforms existing path-based methods, achieving perceptually aligned explanations. This work introduces a new generative perspective for flexible, inference-time controllable Explainable Artificial Intelligence (XAI) methods.