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partners: (langchain-deepseek) fix deepseek-r1 always returns an empty reasoning_content when reasoning (#31065)

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## Description
deepseek-r1 always returns an empty string `reasoning_content` to the
first chunk when thinking, and sets `reasoning_content` to None when
thinking is over, to determine when to switch to normal output.

Therefore, whether the reasoning_content field exists should be judged
as None.

## Demo
deepseek-r1 reasoning output: 

```
{'delta': {'content': None, 'function_call': None, 'refusal': None, 'role': 'assistant', 'tool_calls': None, 'reasoning_content': ''}, 'finish_reason': None, 'index': 0, 'logprobs': None}
{'delta': {'content': None, 'function_call': None, 'refusal': None, 'role': None, 'tool_calls': None, 'reasoning_content': '好的'}, 'finish_reason': None, 'index': 0, 'logprobs': None}
{'delta': {'content': None, 'function_call': None, 'refusal': None, 'role': None, 'tool_calls': None, 'reasoning_content': '，'}, 'finish_reason': None, 'index': 0, 'logprobs': None}
{'delta': {'content': None, 'function_call': None, 'refusal': None, 'role': None, 'tool_calls': None, 'reasoning_content': '用户'}, 'finish_reason': None, 'index': 0, 'logprobs': None}
...
```

deepseek-r1 first normal output
```
...
{'delta': {'content': ' main', 'function_call': None, 'refusal': None, 'role': None, 'tool_calls': None, 'reasoning_content': None}, 'finish_reason': None, 'index': 0, 'logprobs': None}
{'delta': {'content': '\n\nimport', 'function_call': None, 'refusal': None, 'role': None, 'tool_calls': None, 'reasoning_content': None}, 'finish_reason': None, 'index': 0, 'logprobs': None}
...
```

---------

Co-authored-by: ccurme <chester.curme@gmail.com>
This commit is contained in:
唐小鸭 2025-05-06 06:31:58 +08:00 committed by GitHub
parent c0b69808a8
commit 50fa524a6d
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GPG Key ID: B5690EEEBB952194
1 changed files with 4 additions and 2 deletions
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6
libs/partners/deepseek/langchain_deepseek/chat_models.py
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@ -255,12 +255,14 @@ class ChatDeepSeek(BaseChatOpenAI):
if (choices := chunk.get("choices")) and generation_chunk:
top = choices[0]
if isinstance(generation_chunk.message, AIMessageChunk):
if reasoning_content := top.get("delta", {}).get("reasoning_content"):
if (
reasoning_content := top.get("delta", {}).get("reasoning_content")
) is not None:
generation_chunk.message.additional_kwargs["reasoning_content"] = (
reasoning_content
)
# Handle use via OpenRouter
elif reasoning := top.get("delta", {}).get("reasoning"):
elif (reasoning := top.get("delta", {}).get("reasoning")) is not None:
generation_chunk.message.additional_kwargs["reasoning_content"] = (
reasoning
)