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The predict_and_parse is deprecated, instead pass an output parser directly to LLMChain. (#20130)

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The `predict_and_parse` method is deprecated, instead pass an output
parser directly to LLMChain.

- [x] **PR title**: "langchain: update chain_extract.py"


![image](https://github.com/langchain-ai/langchain/assets/40889019/e950d79f-5a0f-4086-86e9-89f627990fe5)

---------

Co-authored-by: Chester Curme <chester.curme@gmail.com>
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Silas Xu 2024-05-08 21:32:17 +08:00 committed by GitHub
parent 3c31bd0ed0
commit aafaf3e193
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libs/langchain/langchain/retrievers/document_compressors/chain_extract.py
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@ -64,7 +64,10 @@ class LLMChainExtractor(BaseDocumentCompressor):
compressed_docs = []
for doc in documents:
_input = self.get_input(query, doc)
output = self.llm_chain.predict_and_parse(**_input, callbacks=callbacks)
output_dict = self.llm_chain.invoke(_input, config={"callbacks": callbacks})
output = output_dict[self.llm_chain.output_key]
if self.llm_chain.prompt.output_parser is not None:
output = self.llm_chain.prompt.output_parser.parse(output)
if len(output) == 0:
continue
compressed_docs.append(