LangChain Advanced RAG - Two-Stage Retrieval with Cross Encoder (BERT)

In this Video we discuss advanced retrieval techniques from Vector Databases with Query Expansion and Two-Stage Retrieval with a Cross Encoder. We use another Reranker on top to take the famous "lost in the middle" problem into consideration.

Code: github.com/Coding-Crashkurse/Applied-Advanced-RAG

Timestamps:
0:00 Two-Stage Retrieval in theory
2:44 RAG and it´s issues
9:31 Query Expansion
11:50 Cross Encoder Reranking
13:50 LongContext Reorder

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