Reference · Glossary
Cosine similarity
Last updated
A score from **-1 to 1** measuring how aligned two vectors are — common for comparing embeddings.
When to use
RAG retrieval, duplicate detection, recommendation "more like this."
When not to
When you need literal string match — use keyword search or hybrid search.
Example
Two similar sentences → embeddings with cosine ≈ 0.9; unrelated topics → closer to 0.