Fix wrong prompt in refine chain (#1770)

nqbao · bnguyenrk · web-flow · commit 85e4dd7fc328 · 2023-03-19T10:03:45.000-07:00
I got this during testing 

```
ValueError: Missing some input keys: {'existing_answer'}
```

Upon review, the initial prompt should be `QUESTION_PROMPT_SELECTOR`.

Co-authored-by: Bao Nguyen &lt;bnguyen@roku.com&gt;
diff --git a/langchain/chains/question_answering/__init__.py b/langchain/chains/question_answering/__init__.py
@@ -155,7 +155,7 @@ def _load_refine_chain(
     **kwargs: Any,
 ) -> RefineDocumentsChain:
     _question_prompt = (
-        question_prompt or refine_prompts.REFINE_PROMPT_SELECTOR.get_prompt(llm)
+        question_prompt or refine_prompts.QUESTION_PROMPT_SELECTOR.get_prompt(llm)
     )
     _refine_prompt = refine_prompt or refine_prompts.REFINE_PROMPT_SELECTOR.get_prompt(
         llm

Original file line number	Diff line number	Diff line change
`@@ -155,7 +155,7 @@ def _load_refine_chain(`
`155`	`155`	`**kwargs: Any,`
`156`	`156`	`) -> RefineDocumentsChain:`
`157`	`157`	`_question_prompt = (`
`158`		`- question_prompt or refine_prompts.REFINE_PROMPT_SELECTOR.get_prompt(llm)`
	`158`	`+ question_prompt or refine_prompts.QUESTION_PROMPT_SELECTOR.get_prompt(llm)`
`159`	`159`	`)`
`160`	`160`	`_refine_prompt = refine_prompt or refine_prompts.REFINE_PROMPT_SELECTOR.get_prompt(`
`161`	`161`	`llm`