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Kernels and parallelism.
| Kernels | Parallelism | Total threads | Block size |
|---|---|---|---|
| Build fixed-grid spatial index | 1 point/thread | n | 1,024 |
| Calculate local density | 1 point/thread | n | 1,024 |
| Calculate nearest-higher and separation | 1 point/thread | n | 1,024 |
| Decide seeds/outliers, register followers | 1 point/thread | n | 1,024 |
| Expand clusters | 1 seed/thread | k | 1,024 |
