Language Model Inversion

Code

• github.com/jxmorris12/vec2text
  OfficialIn paperpytorch★ 1,084
• github.com/justinchiu/openlogprobs
  none★ 248

Abstract

Language models produce a distribution over the next token; can we use this information to recover the prompt tokens? We consider the problem of language model inversion and show that next-token probabilities contain a surprising amount of information about the preceding text. Often we can recover the text in cases where it is hidden from the user, motivating a method for recovering unknown prompts given only the model's current distribution output. We consider a variety of model access scenarios, and show how even without predictions for every token in the vocabulary we can recover the probability vector through search. On Llama-2 7b, our inversion method reconstructs prompts with a BLEU of 59 and token-level F1 of 78 and recovers 27\% of prompts exactly. Code for reproducing all experiments is available at http://github.com/jxmorris12/vec2text.

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