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D. Busbridge

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#artificial intelligence Preprint Sep 2026

On Trajectory-Aware Training for Masked Diffusion Language Models

PUMBA is introduced, a unified framework for trajectory-aware training that trains the denoiser on consecutive steps of policy-induced trajectories, passes information between steps, and optimizes them jointly by backpropagation through time.

Manuel Madeira, Amitis Shidani, Alice Bizeul et al. · 0 citations
#artificial intelligence Preprint Sep 2026

Limits of Confidence in Diffusion

It is shown that a step matches the training distribution only when the positions it writes are conditionally independent given the tokens already fixed, that no product of per-position distributions can match a dependent group, and that per-position distributions do not determine whether a group is dependent.

Russ Webb, Amitis Shidani, Alice Bizeul et al. · 1 citation

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