Grokking the AI System Design Interview
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Hybrid Search and Reranking

Know the Vocabulary

This lesson uses the terms below many times. Read them once now, and come back here when a later section needs one.

  • Chunk: A focused passage cut from a document. It is the unit that retrieval works with.
  • Embedding: A list of numbers that encodes the meaning of a piece of text. Texts with similar meanings get similar numbers.
  • Semantic search: Finding chunks whose meaning is close to the question's meaning. It runs an approximate nearest neighbor (ANN) search over embeddings.
  • Lexical search: Finding chunks that contain the question's exact words

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