Why it matters

Lookahead needs no training. Easy speedup on any model.

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The architecture

Parallel Jacobi iteration.

N-gram cache.

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Lookahead decodingJacobi iterationparallel guessesN-gram cachereuse patternsVerify + accept1.5-2x speedFu et al. 2024; training-free; effective for structured outputs like code
Lookahead decoding.
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How it works end to end

Fu et al. 2024.

N-gram cache reuse.

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