Index Related Chains
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Chains related to working with unstructured data stored in indexes.
📄️ ConversationalRetrievalQAChain
The ConversationalRetrievalQA chain builds on RetrievalQAChain to provide a chat history component.
📄️ Document QA Chains
LangChain provides chains used for processing unstructured text data: StuffDocumentsChain and MapReduceDocumentsChain.
📄️ RetrievalQAChain
The RetrievalQAChain is a chain that combines a Retriever and a QA chain (described above). It is used to retrieve documents from a Retriever and then use a QA chain to answer a question based on the retrieved documents.