0be354a920
Single-commit clean baseline after security scrub of niche-tells, project codenames, internal jargon, and contributor-email leaks. Contents: - 100 Rust crates (_primitives/_rust/) - 37 agent manifests (_manifests/) + generated specs (_generated/) - 67 user-invocable skills (skills/) - 33 hooks (hooks/) - Composition blocks (_blocks/) - Documentation (docs/, README.md) - TS adapter packages (_ts_packages/) - Assembler (_assembler/) - Roles (_roles/) - Templates (_templates/) - Forgejo CI (.forgejo/) Author: Denis Parfionovich <info@greendragon.info> License: see LICENSE.
28 lines
943 B
Rust
28 lines
943 B
Rust
//! Cosine similarity over sparse term-weight maps.
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//!
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//! Constructor Pattern: one cube, one pure-math responsibility.
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//! Classical numerator = Σ a·b over shared keys;
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//! classical denominator = ‖a‖₂ · ‖b‖₂. No normalize-to-Frobenius, no rank
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//! projection — just textbook cosine on HashMap<String, f64>.
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use std::collections::HashMap;
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/// Cosine similarity between two sparse vectors keyed by token.
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pub fn cosine_tfidf(a: &HashMap<String, f64>, b: &HashMap<String, f64>) -> f64 {
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if a.is_empty() || b.is_empty() {
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return 0.0;
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}
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let mut dot = 0.0f64;
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for (k, va) in a {
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if let Some(vb) = b.get(k) {
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dot += va * vb;
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}
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}
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let norm_a: f64 = a.values().map(|v| v * v).sum::<f64>().sqrt();
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let norm_b: f64 = b.values().map(|v| v * v).sum::<f64>().sqrt();
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if norm_a == 0.0 || norm_b == 0.0 {
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0.0
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} else {
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dot / (norm_a * norm_b)
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}
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}
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