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[BUGFIX] Move scores to float32 in case of running xgrammar on cpu (#12152)

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Signed-off-by: Michal Adamczyk <madamczyk@habana.ai>
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Michal Adamczyk 2025-01-19 04:12:05 +01:00 committed by GitHub
parent 7a8a48d51e
commit 4e94951bb1
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1 changed files with 5 additions and 2 deletions
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7
vllm/model_executor/guided_decoding/xgrammar_decoding.py
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@ -298,8 +298,11 @@ class XGrammarLogitsProcessor:
# token_bitmask is a CPU tensor for use with accept_token and # token_bitmask is a CPU tensor for use with accept_token and
# fill_next_token_bitmask so we move it to the device of scores # fill_next_token_bitmask so we move it to the device of scores
device_type = scores.device.type device_type = scores.device.type
dtype = scores.dtype
if device_type != "cuda": if device_type != "cuda":
scores = scores.to("cpu").unsqueeze(0) # xgrammar on cpu only supports float32 scores
# see: https://github.com/mlc-ai/xgrammar/blob/c1b64920cad24f44f235778c1c00bb52d57da01a/python/xgrammar/kernels/apply_token_bitmask_inplace_cpu.py#L22
scores = scores.to("cpu").float().unsqueeze(0)
# Note: In this method, if the tensors have different dimensions # Note: In this method, if the tensors have different dimensions
# on CPU device fails, but on GPU it runs without error. Hence the # on CPU device fails, but on GPU it runs without error. Hence the
@ -307,7 +310,7 @@ class XGrammarLogitsProcessor:
xgr.apply_token_bitmask_inplace(scores, xgr.apply_token_bitmask_inplace(scores,
self.token_bitmask.to(scores.device)) self.token_bitmask.to(scores.device))
if device_type != "cuda": if device_type != "cuda":
scores = scores.to(device_type).squeeze() scores = scores.to(dtype).to(device_type).squeeze()
return scores return scores