speculative decoding

FDE interview questions tagged speculative decoding, across every topic.

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Concepts behind "speculative decoding"

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Speculative DecodingDecoding is slow because each token needs a full forward pass through a huge memory-bound model. Speculative decoding has a small fast draft model propose several tokens at once, then the large target model verifies them all in a single forward pass and keeps the longest correct prefix. A careful accept rule makes the output provably identical to sampling from the target model, so you get lower latency for free, not an approximation.

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