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V. Cevher

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#machine learning Preprint Sep 2026

Complex KDA: Understanding and Enhancing the Expressivity of Kimi Delta Attention

This work shows that Kimi Delta Attention (KDA) can realize 2D rotations by combining a single delta-rule transformation with a second reflection supplied by its channel-wise gate, and characterize the expressivity of CKDA and prove that every orthogonal diagonal-plus-rank-one matrix is exactly a CKDA transition matrix...

Julien Siems, Riccardo Grazzi, Korbinian Pöppel et al. · 1 citation · ⚡1

Attention-Discounted Adaptive Sampler for Masked Diffusion Language Models

ADAS is proposed, a training-free reranking rule that leaves the base sampler's stopping rule unchanged and greedily discounts each token-wise confidence score according to its attention to already selected positions, weighted by their prediction uncertainty.

Y. Şahin, Ahmed R. Saikia, V. Cevher et al. · 1 citation
Jul 2026

Raven: High-Recall Sequence Modeling with Sparse Memory Routing

Interpolating between these models, Raven is introduced, a linear-time sequence model that maintains a fixed set of memory slots and, at each step, decays and updates only a selected subset via learned, input-dependent routing, thereby preserving long-range content much more effectively.

Arshia Afzal, Aviv Bick, Eric P. Xing et al. · 5 citations
Jul 2026

When Does On-Policy Interaction Help? Representational Tradeoffs in Value-Based Imitation Learning

This work introduces OVI, an interactive on-policy IL algorithm that is statistically efficient whenever the learner can represent the expert's value function and computationally efficient given access to a linear maximization oracle, and introduces a negative result showing that interaction is necessary.

Luca Viano, Antoine Moulin, Audrey Huang et al. · 0 citations

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