[Speculative decoding] Support target-model logprobs #4378
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btw, warning; there willl be a big sampler refactoring in this PR; #4309 |
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thanks for heads up; I think I can keep it decoupled |
cadedaniel
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Yard1
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May 2, 2024
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@cadedaniel can we get this merged today? |
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@richardliaw yep @Yard1 I benchmarked and there is room to optimize. I feel we should follow up once we have E2E spec decode numbers (the implementation is reasonably efficient) |
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This PR allows vLLM to return correct log-probabilities of sampled tokens when speculative decoding is enabled. In addition, if the user specifies
logprobsin their request, the correct top-k logprobs are returned.The log-probabilities are expected to be equal to the log-probabilities when speculative decoding is not used.
Testing