mirror of
https://github.com/ruvnet/RuView
synced 2026-07-05 14:33:19 +00:00
ruv
2b903752c4
Establishes the kernel-level output-divergence envelope between the two backends — what §5's downstream-metric gate (contrastive loss, rank-1, Spearman) would calibrate against. Two regimes: 1. Saturated pattern (window ≥ N, block ≥ N): sparse and dense visit the same edge set, so divergence reflects only float accumulation order. **Asserted < 1e-4** at N=32, heads=4, dim=16. Tight bound. 2. Realistic sparse (window=16, block=32, N=256): real approximation, real divergence. **Measured max_abs_err = 5.22e-3, mean = 1.79e-3** on the deterministic test inputs. Sanity-checked finite + < 1.0 so structural breakage (NaN, softmax overflow) trips a panic, but the specific numbers are *baseline data* not a hard contract — the §5 gate cares about downstream task metrics, not bit-equality. Why this is in the test suite rather than a benchmark: - It runs in <0.2s, no need to gate behind --release. - The saturated-pattern bound IS a hard contract — if that breaks the kernel changed semantics in a way the API hides, and we want CI to catch it. - Printing the realistic-pattern numbers (eprintln, visible with --nocapture) gives a known-good reference point to compare future builds against. Test count is now 21/21 across the crate (6 smoke + 8 weight blob + 2 blob e2e + 3 streaming + 2 dense-vs-sparse). Co-Authored-By: claude-flow <ruv@ruv.net>