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[OAI Server Refactor] [ChatCompletions & Completions] Support Return Hidden States #7260

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[OAI Server Refactor] [ChatCompletions & Completions] Support Return Hidden States#7260
@CatherineSue

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@CatherineSue
CatherineSue
opened on Jun 17, 2025

Points: 2-3 days

Description: Support return hidden states in serving_chat.py and serving_completions.py

Deliverables:

  • Complete task below
  • Add UTs

Task: Missing hidden states **

Current streaming logic in adapter.py#L691-699:

sglang/python/sglang/srt/openai_api/adapter.py

Lines 691 to 699 in ca92911

hidden_states = None
if isinstance(request, list) and request[idx].return_hidden_states:
hidden_states = ret_item["meta_info"].get("hidden_states", None)
elif (not isinstance(request, list)) and request.return_hidden_states:
hidden_states = ret_item["meta_info"].get("hidden_states", None)
if hidden_states is not None:
hidden_states = (
hidden_states[-1] if hidden_states and len(hidden_states) > 1 else []
)

Current logic in adapter.py#L1370-L1382:

sglang/python/sglang/srt/openai_api/adapter.py

Lines 1370 to 1382 in ca92911

if isinstance(request, list) and request[idx].return_hidden_states:
include_hidden_states = True
elif not isinstance(request, list) and request.return_hidden_states:
include_hidden_states = True
else:
include_hidden_states = False
if include_hidden_states and ret_item["meta_info"].get("hidden_states", None):
hidden_states = ret_item["meta_info"]["hidden_states"]
hidden_states = (
hidden_states[-1] if hidden_states and len(hidden_states) > 1 else []
)
else:
hidden_states = None

  • Need to support it in serving_chat.py and serving_completions.py .

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