Late-interaction retrieval (ColBERT / PyLate) bottlenecks on materializing the full similarity matrix. This kernel avoids it by using tiled scoring with simdgroup_matrix (Metal) and WMMA.
The result is 3–5× speedup compared to naive PyTorch baseline 🔥
Benchmarks: - SmallRerank (B=32, C=10): up to 3.2× (M3 Pro) / 2.8× (A100) - HeavyRerank (B=32, C=100): up to 3.8× (M3 Pro) / 5.3× (A100) - LongDocStress (Ld=1024): up to 6.2× (L4)