[Performance] [Speculative decoding]: Replace scoring spec tokens via batched 1-step generation by n-step prefill #7255
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sergeykochetkov
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FIX #5239, #7586
No (or small) performance improvements at speculative decoding partly related to unefficient scoring. Currently vLLM uses batch_expansion which to score n speculative tokens creates batch of n+1 generation requests. Idea of current PR is to score n spec tokens by single prefill request.