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Feature/logprob bug fix (#2817)
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* fix: handle missing logprobs at step 0 and incorrect finish reason with max_completion_tokens

* Prevent response_logprobs.logprob_token_ids[0] from going out of bounds
This commit is contained in:
zhenwenDang
2025-07-12 16:48:51 +08:00
committed by GitHub
parent e9e8443ea8
commit d48c03413f
1 changed files with 23 additions and 10 deletions
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33
fastdeploy/entrypoints/openai/serving_chat.py
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@@ -212,7 +212,8 @@ class OpenAIServingChat:
sampled_token_ranks=raw_top_logprobs[2],
)
logprobs_res = self.build_logprobs_response(
logprobs=top_logprobs,
request_logprobs=request.logprobs,
response_logprobs=top_logprobs,
request_top_logprobs=request.top_logprobs,
)
@@ -229,7 +230,9 @@ class OpenAIServingChat:
if res["finished"]:
num_choices -= 1
work_process_metrics.e2e_request_latency.observe(time.time() - res["metrics"]["request_start_time"])
if request.max_tokens is None or previous_num_tokens != request.max_tokens:
has_no_token_limit = request.max_tokens is None and request.max_completion_tokens is None
max_tokens = request.max_completion_tokens or request.max_tokens
if has_no_token_limit or previous_num_tokens != max_tokens:
choice.finish_reason = "stop"
if self.engine_client.reasoning_parser == "ernie_x1" and \
output.get("finish_reason", "") == "tool_calls":
@@ -337,7 +340,8 @@ class OpenAIServingChat:
sampled_token_ranks=raw_top_logprobs[2],
)
logprobs_res = self.build_logprobs_response(
logprobs=top_logprobs,
request_logprobs=request.logprobs,
response_logprobs=top_logprobs,
request_top_logprobs=request.top_logprobs,
)
if logprobs_res and logprobs_res.content is not None:
@@ -369,7 +373,9 @@ class OpenAIServingChat:
logprobs=logprobs_full_res,
finish_reason=None
)
if request.max_tokens is None or previous_num_tokens != request.max_tokens:
has_no_token_limit = request.max_tokens is None and request.max_completion_tokens is None
max_tokens = request.max_completion_tokens or request.max_tokens
if has_no_token_limit or previous_num_tokens != max_tokens:
choice.finish_reason = "stop"
if self.engine_client.reasoning_parser == "ernie_x1" and \
output.get("finish_reason", "") == "tool_calls":
@@ -400,7 +406,8 @@ class OpenAIServingChat:
def build_logprobs_response(
self,
logprobs: Optional[LogprobsLists],
request_logprobs: bool,
response_logprobs: Optional[LogprobsLists],
request_top_logprobs: int,
) -> Optional[LogProbs]:
"""
@@ -410,17 +417,23 @@ class OpenAIServingChat:
# Parameter validation
if (
logprobs is None
response_logprobs is None
or not request_logprobs
or request_top_logprobs is None
or request_top_logprobs <= 0
or len(logprobs.logprob_token_ids) == 0
or request_top_logprobs < 0
):
return None
try:
# The top-k candidates for the current token
topk_token_ids = logprobs.logprob_token_ids[0][:request_top_logprobs + 1]
topk_logprobs = logprobs.logprobs[0][:request_top_logprobs + 1]
topk_token_ids = []
topk_logprobs = []
if response_logprobs.logprob_token_ids and len(response_logprobs.logprob_token_ids) > 0:
topk_token_ids = response_logprobs.logprob_token_ids[0][:request_top_logprobs + 1]
if response_logprobs.logprobs and len(response_logprobs.logprobs) > 0:
topk_logprobs = response_logprobs.logprobs[0][:request_top_logprobs + 1]
# Construct the candidate token structure (LogProbEntry) of topk
top_logprob_entries: List[LogProbEntry] = []