Cluster (Vector Space)

Technical implementation · AI Search Infrastructure

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Definition

A cluster is a region in vector space where semantically similar texts are grouped. Content about the same topic occupies nearby positions; content about different topics occupies distant positions. Retrieval finds the content nearest to a query’s position in this space.

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Why It Matters for AI Search

Understanding clusters explains why mixed-topic content retrieves poorly for everything. A passage that splits its meaning between two topics lands between two clusters — close to neither one. A passage that stays within one cluster retrieves consistently for all queries that land in that region. The structural instruction — one topic per section — is a geometric instruction: stay inside one cluster.

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Related Terms

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