NLP
Adaptive Decoding via Latent Preference Optimization
November 19, 2024
Abstract
During language model decoding, it is known that using higher temperature sampling gives more creative responses, while lower temperatures are more factually accurate. However, such models are commonly applied to general instruction following, which involves both creative and fact seeking tasks, using a single fixed temperature across all examples and tokens. In this work, we introduce Adaptive Decoding, a layer added to the model to select the sampling temperature dynamically at inference time, at either the token or example level, in order to optimize performance. To learn its parameters we introduce Latent Preference Optimization (LPO) a general approach to train discrete latent variables such as choices of temperature. Our method outperforms all fixed decoding temperatures across a range of tasks that require different temperatures, including UltraFeedback, Creative Story Writing, and GSM8K.
AUTHORS
Written by
Shehzaad Dhuliawala
Jack Lanchantin
Asli Celikyilmaz
Ilia Kulikov
Ping Yu
Publisher
arXiv
Research Topics
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