arXiv AI

Which Influence Are We Estimating? The Role of Counterfactual Specifications in Data Attribution

The paper investigates how the definition of influence—specifically the behavior being attributed, the intervention on training data, and the counterfactual training process—affects rankings produced by influence estimators. It formalizes influence as a counterfactual estimand, distinguishes specification mismatch from approximation error, and categorizes existing estimators by their implied specifications. Experiments demonstrate that different specifications can lead to markedly different rankings, and that careful specification choice improves attribution quality in tasks such as noisy label detection and large‑language‑model attribution.

arXiv AI
Sep 3

From Reweighting to Rewriting: Unlocking the Intervention Effects of Influential Samples in Training Data Attribution

The paper investigates how training data attribution (TDA) can be used to influence large language models (LLMs). It compares two methods—reweighting and influence-guided response rewriting—on examples selected by influence functions. Rewriting, which replaces responses while keeping instructions fixed, yields stronger, more persistent, and bidirectional behavioral changes than reweighting, suggesting that the intervention value of influential samples is better realized through rewriting.

By Yuzhang Luo, Chenpeng Wang, Jianhui Chen, Liangming Pan
arXiv Machine Learning
Jun 10

From Observation to Intervention: A Causal Audit of Expert Importance in Mixture-of-Experts Models

arXiv:2606. 10703v1 Announce Type: new Abstract: Interpretability methods routinely use population-level summary statistics over observed model behaviour to license claims about the effects of targeted interventions on specific computations; in Pearl's terms, they treat rung-1 associational evidence as if it supported rung-2 interventional conclusions, a move whose validity is rarely tested.

By Leonard Engmann, Christian Medeiros Adriano, Holger Giese
arXiv Machine Learning
Sep 10

PUID: A Personalized Deconfounding Framework for Recommender Systems under Hidden Confounding

The paper introduces PUID, a Personalized Unobserved-Confounding-aware Interaction Deconfounder, designed to mitigate hidden confounding in recommender systems without relying on costly randomized controlled trials. PUID estimates user-item level sensitivity bounds using an entropy-based method that gauges the strength of hidden confounding from the mutual information between observed features and exposure status. An adversarial optimization strategy and a benchmark-guided variant (BPUID) further enhance robustness and predictive accuracy, and experiments on three real-world datasets show consistent outperformance over state-of-the-art baselines.

By Zongyu Li