> Expert execution is deterministic (pure matmul).

Isn't that only true in theory but wrong in practice due to floating points?

There are fixed-point models too which can be deterministic. But for floating point you are very instruction-set dependent, never mind floating point operations not being commutative.

The harder case isn't same-hardware determinism; it's that lumabri wants CPU and GPU peers in the same swarm. Accumulation order differs across hardware, not just across runs.

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