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[Structured Outputs] Refactor bitmask construction into get_grammar_bitmask (#23361)

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Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>
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Woosuk Kwon 2025-08-21 13:53:33 -07:00 committed by GitHub
parent 044931f97b
commit 800349c2a5
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GPG Key ID: B5690EEEBB952194
1 changed files with 33 additions and 22 deletions
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55
vllm/v1/core/sched/scheduler.py
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@ -177,14 +177,6 @@ class Scheduler(SchedulerInterface):
scheduled_running_reqs: list[Request] = []
preempted_reqs: list[Request] = []
# NOTE: structured_output_request_ids maps
# a request's (request that uses structured output)
# request_id to the running request index.
# This will helps us determine to slice the grammar bitmask
# and only applies valid mask for requests that
# uses structured decoding.
structured_output_request_ids: dict[str, int] = {}
req_to_new_blocks: dict[str, KVCacheBlocks] = {}
num_scheduled_tokens: dict[str, int] = {}
token_budget = self.max_num_scheduled_tokens
@ -282,12 +274,6 @@ class Scheduler(SchedulerInterface):
# Schedule the request.
scheduled_running_reqs.append(request)
if request.use_structured_output:
# PERF: in case of chunked prefill,
# request might not include any new tokens.
# Therefore, we might introduce some additional
# cycle to fill in the bitmask, which could be a big no-op.
structured_output_request_ids[request.request_id] = req_index
req_to_new_blocks[request.request_id] = new_blocks
num_scheduled_tokens[request.request_id] = num_new_tokens
token_budget -= num_new_tokens
@ -477,9 +463,6 @@ class Scheduler(SchedulerInterface):
request.status = RequestStatus.WAITING_FOR_REMOTE_KVS
continue
if request.use_structured_output:
structured_output_request_ids[request.request_id] = (
req_index)
req_index += 1
self.running.append(request)
if self.log_stats:
@ -538,11 +521,6 @@ class Scheduler(SchedulerInterface):
self.kv_cache_manager.get_num_common_prefix_blocks(
any_request, len(self.running)))
grammar_bitmask = self.structured_output_manager.grammar_bitmask(
self.requests,
structured_output_request_ids,
scheduled_spec_decode_tokens,
)
# Construct the scheduler output.
new_reqs_data = [
NewRequestData.from_request(
@ -556,6 +534,9 @@ class Scheduler(SchedulerInterface):
scheduled_spec_decode_tokens,
req_to_new_blocks,
)
structured_output_request_ids, grammar_bitmask = (
self.get_grammar_bitmask(self.running,
scheduled_spec_decode_tokens))
scheduler_output = SchedulerOutput(
scheduled_new_reqs=new_reqs_data,
scheduled_cached_reqs=cached_reqs_data,
@ -753,6 +734,36 @@ class Scheduler(SchedulerInterface):
encoder_inputs_to_schedule.append(i)
return encoder_inputs_to_schedule, num_new_tokens, encoder_budget
def get_grammar_bitmask(
self,
requests: list[Request],
scheduled_spec_decode_tokens: dict[str, list[int]],
):
# NOTE: structured_output_request_ids maps
# a request's (request that uses structured output)
# request_id to its index in the batch.
# This will helps us determine to slice the grammar bitmask
# and only applies valid mask for requests that
# uses structured decoding.
structured_output_request_ids: dict[str, int] = {}
for i, req in enumerate(requests):
if req.use_structured_output:
# PERF: in case of chunked prefill,
# request might not include any new tokens.
# Therefore, we might introduce some additional
# cycle to fill in the bitmask, which could be a big no-op.
structured_output_request_ids[req.request_id] = i
if not structured_output_request_ids:
bitmask = None
else:
bitmask = self.structured_output_manager.grammar_bitmask(
self.requests,
structured_output_request_ids,
scheduled_spec_decode_tokens,
)
return structured_output_request_ids, bitmask
def update_from_output(
self,
scheduler_output: SchedulerOutput,