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[BugFix] Lazily import XgrammarBackend to avoid early cuda init (#15171)

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Signed-off-by: Nick Hill <nhill@redhat.com>
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Nick Hill 2025-03-19 18:30:43 -07:00 committed by GitHub
parent cfbca8a2f2
commit c47aafa37c
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1 changed files with 3 additions and 1 deletions
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4
vllm/v1/structured_output/__init__.py
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@ -9,7 +9,6 @@ from vllm.config import VllmConfig
from vllm.logger import init_logger from vllm.logger import init_logger
from vllm.v1.structured_output.backend_types import (StructuredOutputBackend, from vllm.v1.structured_output.backend_types import (StructuredOutputBackend,
StructuredOutputGrammar) StructuredOutputGrammar)
from vllm.v1.structured_output.backend_xgrammar import XgrammarBackend
if TYPE_CHECKING: if TYPE_CHECKING:
import numpy as np import numpy as np
@ -47,6 +46,9 @@ class StructuredOutputManager:
if self.backend is None: if self.backend is None:
backend_name = request.sampling_params.guided_decoding.backend_name backend_name = request.sampling_params.guided_decoding.backend_name
if backend_name == "xgrammar": if backend_name == "xgrammar":
from vllm.v1.structured_output.backend_xgrammar import (
XgrammarBackend)
self.backend = XgrammarBackend(self.vllm_config) self.backend = XgrammarBackend(self.vllm_config)
else: else:
raise ValueError( raise ValueError(