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FUDGE: Controlled Text Generation With Future Discriminators

2021-04-12 05:59:53
Kevin Yang, Dan Klein
arXiv_CL
     
Abstract

We propose Future Discriminators for Generation (FUDGE), a flexible and modular method for controlled text generation. Given a pre-existing model G for generating text from a distribution of interest, FUDGE enables conditioning on a desired attribute a (for example, formality) while requiring access only to G's output logits. FUDGE learns an attribute predictor operating on a partial sequence, and uses this predictor's outputs to adjust G's original probabilities. We show that FUDGE models terms corresponding to a Bayesian decomposition of the conditional distribution of G given attribute a. Moreover, FUDGE can easily compose predictors for multiple desired attributes. We evaluate FUDGE on three tasks -- couplet completion in poetry, topic control in language generation, and formality change in machine translation -- and observe gains in all three tasks.

Abstract (translated)

URL

https://arxiv.org/abs/2104.05218

PDF

https://arxiv.org/pdf/2104.05218.pdf

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