What is the primary limitation of semantic search discussed in the transcript?	It can sometimes return irrelevant results or fail in corner cases, even if the technique is generally effective.
What strategy is proposed to improve the accuracy of RAG search results?	Implementing a hybrid approach by combining semantic search with a separate lexical search system.
How is lexical search fundamentally different from semantic search?	Lexical search is a classic text search that breaks down a query into individual words to find matching text chunks.
What is the specific lexical search technique introduced to improve RAG pipelines?	BM25 (Best Match 25).
What is the first step in the BM25 algorithm when processing a user query?	Tokenizing the query, which means breaking it up into separate chunks (words) based on spaces and removing punctuation.
How does the BM25 algorithm assign relative importance to search terms?	It assigns importance based on the term's usage frequency; rare terms are given higher search importance.
What is the final step in the BM25 algorithm?	Finding the text chunk that uses the higher weighted (more important) terms more often.
What is the ultimate goal of merging semantic and lexical search results?	To achieve a better balance of search results, incorporating both semantic understanding and precise plain text matching.