Road for `arrowspace` to scale: Condense, Project, and Sparsify
This release rethinks how `arrowspace` builds and queries graph structure from high‑dimensional embedding up to 10⁵ items and 10³ features.
- The Laplacian computation now:
- condenses data with clustering and density‑aware sampling,
- projects dimensionality proportionally to the problem size (centroids) and keeps queries consistent with that projection, and
- sparsifies the graph with a fast spectral method to preserve structure while slashing cost.