mirror of
https://github.com/hwchase17/langchain
synced 2024-11-08 07:10:35 +00:00
ffae98d371
fixed multi-query template for Vectara added self-query template for Vectara Also added prompt_name parameter to summarization CC @efriis **Twitter handle:** @ofermend
57 lines
2.3 KiB
Python
57 lines
2.3 KiB
Python
import os
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from langchain.retrievers.multi_query import MultiQueryRetriever
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from langchain_community.chat_models import ChatOpenAI
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from langchain_community.vectorstores import Vectara
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from langchain_core.output_parsers import StrOutputParser
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from langchain_core.pydantic_v1 import BaseModel
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from langchain_core.runnables import RunnableParallel, RunnablePassthrough
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if os.environ.get("VECTARA_CUSTOMER_ID", None) is None:
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raise Exception("Missing `VECTARA_CUSTOMER_ID` environment variable.")
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if os.environ.get("VECTARA_CORPUS_ID", None) is None:
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raise Exception("Missing `VECTARA_CORPUS_ID` environment variable.")
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if os.environ.get("VECTARA_API_KEY", None) is None:
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raise Exception("Missing `VECTARA_API_KEY` environment variable.")
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# Setup the Vectara retriever with your Corpus ID and API Key
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# note you can customize the retriever behavior by passing additional arguments:
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# - k: number of results to return (defaults to 5)
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# - lambda_val: the
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# [lexical matching](https://docs.vectara.com/docs/api-reference/search-apis/lexical-matching)
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# factor for hybrid search (defaults to 0.025)
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# - filter: a [filter](https://docs.vectara.com/docs/common-use-cases/filtering-by-metadata/filter-overview)
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# to apply to the results (default None)
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# - n_sentence_context: number of sentences to include before/after the actual matching
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# segment when returning results. This defaults to 2.
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# - mmr_config: can be used to specify MMR mode in the query.
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# - is_enabled: True or False
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# - mmr_k: number of results to use for MMR reranking
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# - diversity_bias: 0 = no diversity, 1 = full diversity. This is the lambda
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# parameter in the MMR formula and is in the range 0...1
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vectara_retriever = Vectara().as_retriever()
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# Setup the Multi-query retriever
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llm = ChatOpenAI(temperature=0)
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retriever = MultiQueryRetriever.from_llm(retriever=vectara_retriever, llm=llm)
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# Setup RAG pipeline with multi-query.
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# We extract the summary from the RAG output, which is the last document
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# (if summary is enabled)
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# Note that if you want to extract the citation information, you can use res[:-1]]
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chain = (
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RunnableParallel({"context": retriever, "question": RunnablePassthrough()})
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| (lambda res: res[-1])
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| StrOutputParser()
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)
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# Add typing for input
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class Question(BaseModel):
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__root__: str
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chain = chain.with_types(input_type=Question)
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