ipfrs-semantic 0.2.0

Semantic search with HNSW vector indexing for content-addressed data
Documentation 
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//! Auto-generated module
//!
//! 🤖 Generated with [SplitRS](https://github.com/cool-japan/splitrs)

use std::time::{SystemTime, UNIX_EPOCH};

pub(super) fn now_secs() -> u64 {
    SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .map(|d| d.as_secs())
        .unwrap_or(0)
}
#[allow(dead_code)]
pub(super) fn xorshift64(state: &mut u64) -> u64 {
    let mut x = *state;
    x ^= x << 13;
    x ^= x >> 7;
    x ^= x << 17;
    *state = x;
    x
}
pub(super) fn cosine_similarity(a: &[f64], b: &[f64]) -> f64 {
    if a.len() != b.len() || a.is_empty() {
        return 0.0;
    }
    let dot: f64 = a.iter().zip(b.iter()).map(|(x, y)| x * y).sum();
    let na: f64 = a.iter().map(|x| x * x).sum::<f64>().sqrt();
    let nb: f64 = b.iter().map(|x| x * x).sum::<f64>().sqrt();
    if na < 1e-10 || nb < 1e-10 {
        0.0
    } else {
        (dot / (na * nb)).clamp(-1.0, 1.0)
    }
}