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Squared L2 distance between two vectors of equal size. Sparse-aware: dense/dense walks every index; sparse/dense iterates the sparse side's stored entries and accumulates dense-only contributions via a baseline pass; sparse/sparse iterates the union of stored indices on both sides.
squaredL2
Squared L2 distance between two vectors of equal size. Sparse-aware: dense/dense walks every index; sparse/dense iterates the sparse side's stored entries and accumulates dense-only contributions via a baseline pass; sparse/sparse iterates the union of stored indices on both sides.