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Custom LangChain prompt via config.retriever.custom_prompt #84

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Custom LangChain prompt via config.retriever.custom_prompt #84

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12 changes: 12 additions & 0 deletions chatdocs/chains.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
from typing import Any, Callable, Dict, Optional

from langchain.chains import RetrievalQA
from langchain.prompts import PromptTemplate

from .llms import get_llm
from .vectorstores import get_vectorstore
Expand All @@ -14,8 +15,19 @@ def get_retrieval_qa(
db = get_vectorstore(config)
retriever = db.as_retriever(**config["retriever"])
llm = get_llm(config, callback=callback)
chain_type_kwargs = {}

# Prepare and pass custom prompt if provided
if "retriever" in config and "custom_prompt" in config["retriever"]:
custom_prompt = config["retriever"]["custom_prompt"]

chain_type_kwargs["prompt"] = PromptTemplate(
template=custom_prompt, input_variables=["context", "question"]
)

return RetrievalQA.from_chain_type(
llm=llm,
retriever=retriever,
return_source_documents=True,
chain_type_kwargs=chain_type_kwargs
)