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From Decoding to Meta-Generation: Inference-time Algorithms for Large Language Models

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arxiv 2406.16838 v2 pith:3WYKEHWN submitted 2024-06-24 cs.CL cs.LG

classification cs.CLcs.LG
keywords algorithmsgenerationlanguagemeta-generationtoken-levelcomputedecodingduring
verification ladder T0 review T1 audit T2 compute T3 formal
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One of the most striking findings in modern research on large language models (LLMs) is that scaling up compute during training leads to better results. However, less attention has been given to the benefits of scaling compute during inference. This survey focuses on these inference-time approaches. We explore three areas under a unified mathematical formalism: token-level generation algorithms, meta-generation algorithms, and efficient generation. Token-level generation algorithms, often called decoding algorithms, operate by sampling a single token at a time or constructing a token-level search space and then selecting an output. These methods typically assume access to a language model's logits, next-token distributions, or probability scores. Meta-generation algorithms work on partial or full sequences, incorporating domain knowledge, enabling backtracking, and integrating external information. Efficient generation methods aim to reduce token costs and improve the speed of generation. Our survey unifies perspectives from three research communities: traditional natural language processing, modern LLMs, and machine learning systems.

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Cited by 6 Pith papers

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