AI / LlamaIndex Interview Questions
What is a query engine in LlamaIndex?
A query engine is the object you actually call to ask a question against an index. It's created by calling index.as_query_engine() and packages together a retriever and a response synthesizer into a single, easy-to-use interface.
When you call query_engine.query("your question"), it retrieves the relevant Nodes for that question, optionally runs them through node postprocessors, then hands them to the response synthesizer, which prompts the LLM to produce a final grounded answer along with the source Nodes it used.
Query engines are stateless, meaning each call is independent and doesn't remember previous questions, which distinguishes them from chat engines.
A query engine in LlamaIndex is created by calling:
Query engines are described as stateless because:
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