Trait DistanceMetric

pub trait DistanceMetric: Send + Sync {
    // Required methods
    fn distance(&self, a: &[f32], b: &[f32]) -> f32;
    fn name(&self) -> &str;
}

A distance metric over vectors.

Implementations must satisfy metric properties:

• Non-negativity: $d(a, b) \geq 0$
• Identity: $d(a, a) = 0$
• Symmetry: $d(a, b) = d(b, a)$

Triangle inequality is desired but not required (cosine distance violates it).

Required Methods

fn distance(&self, a: &[f32], b: &[f32]) -> f32

Compute the distance between two vectors.

Panics

Implementations should panic if a.len() != b.len().

fn name(&self) -> &str

Human-readable name of this metric (e.g., "cosine", "l2").

Implementors

impl DistanceMetric for L2Fn