Author

Garrett Baker

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Jul 2026

Elicitation without Backpropagation: Steering Model Behavior by Optimizing the Latent Posterior

Posterior Prefix Tuning optimizes the parameters of a distribution over hard prompts: it draws prior samples once from the BFT via predictive Monte Carlo (PMC), then estimates the gradient by importance sampling against them.

Garrett Baker, Vinay Pathak, Daniel Murfet et al. · arXiv.org · 0 citations