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[V1][Spec Decode] Handle draft tokens beyond max_model_len (#16087)

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Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
This commit is contained in:
Woosuk Kwon
2025-04-21 12:38:50 -07:00
committed by GitHub
parent 299ebb62b2
commit 3a0fba5cf4
7 changed files with 137 additions and 15 deletions
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28
tests/v1/spec_decode/test_ngram.py
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@@ -2,7 +2,7 @@
import numpy as np
from vllm.config import SpeculativeConfig, VllmConfig
from vllm.config import ModelConfig, SpeculativeConfig, VllmConfig
from vllm.v1.spec_decode.ngram_proposer import (NgramProposer,
_find_subarray_kmp,
_kmp_lps_array)
@@ -42,14 +42,24 @@ def test_find_subarray_kmp():
def test_ngram_proposer():
def ngram_proposer(min_n: int, max_n: int, k: int) -> NgramProposer:
return NgramProposer(vllm_config=VllmConfig(
speculative_config=SpeculativeConfig.from_dict(
{
"prompt_lookup_min": min_n,
"prompt_lookup_max": max_n,
"num_speculative_tokens": k,
"method": "ngram",
})))
# Dummy model config. Just to set max_model_len.
model_config = ModelConfig(model="facebook/opt-125m",
task="generate",
max_model_len=100,
tokenizer="facebook/opt-125m",
tokenizer_mode="auto",
dtype="auto",
seed=None,
trust_remote_code=False)
return NgramProposer(
vllm_config=VllmConfig(model_config=model_config,
speculative_config=SpeculativeConfig.
from_dict({
"prompt_lookup_min": min_n,
"prompt_lookup_max": max_n,
"num_speculative_tokens": k,
"method": "ngram",
})))
# No match.
result = ngram_proposer(