Struct BridgeDiversity 

pub struct BridgeDiversity;

Fraction of distinct category pairs connected by at least one BridgeClassification::Genuine bridge.

High = the projection creates genuine cross-domain connectors across many category boundaries. Low = genuine bridges are concentrated in a few pairs or absent entirely. Returns 1.0 if there are fewer than 2 categories (no pairs to connect).

This replaces BridgeCoherence in the default composite because genuine / total converges to ~0.50 under the quantile-based classification floor regardless of projection quality. BridgeDiversity has real variance across projection configurations and directly measures the breadth of cross-domain connectivity that globetrot’s marble dynamics and reasoning traces depend on.

Trait Implementations

impl QualityMetric for BridgeDiversity

fn name(&self) -> &str

Short identifier for logs and tuner reports.

fn score(&self, pipeline: &SphereQLPipeline) -> f64

Evaluate the pipeline. Must return a value in [0, 1].

fn score_with_components( &self, pipeline: &SphereQLPipeline, ) -> (f64, Vec<(String, f64, f64)>)

Evaluate the pipeline and report any per-component breakdown in the same pass. Returns (score, components) where each component is (name, weight, component_score).