Speculative Decoding and MTP: Why Guessing Is Free
I saw "MTP round-trip" on a checklist for a Megatron conversion pipeline and had no idea what it meant. Two acronyms, one hyphen, apparently important enough that someone had listed it as a thing to verify. Working out what it meant took me somewhere I didn't expect. The interesting part turned out not to be MTP at all — it was the reason speculative decoding works in the first place, which rests…
MTP stands for Multi-Token Prediction, an approach to speculative decoding that generates drafts of up to k tokens ahead of time and has the big model verify all of them in a single pass. This exploits the fact that weight reads, regardless of how many tokens are being processed, are significantly more expensive than the arithmetic involved in processing the tokens themselves.
By splitting generation into a cheap draft and a verification step, speculative decoding can be up to five times faster than traditional sequential generation.
Written by urgent.news from Dev.to's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
