Omar SobhandClaude Fable 5.1 0f578087ce feat(rtx-interpret): drift-gated decoder renormalisation (SAEConfig::normalize_gate) ...

`normalize_gate: Option<(lo, hi)>` — when set, a decoder column is
rescaled to unit norm only if its norm has left the band; columns
inside are left exactly as the gradient step made them (divisor 1.0).
`None` keeps per-step renormalisation, bit for bit.

Why (omni-cortex D629/D630): per-step rescaling was measured doing
two opposite things on the same 32-unit SAE. With it off, two runs
descended cleanly to floors 3-7x LOWER than with it on — it was
fighting descent. Two other runs (lr 0.01, seeds 7 and 99) diverged
outright without it — it was also the clamp holding an unstable rate
finite, turning a blow-up into a slow oscillation that looked like a
healthy dictionary drifting. The band keeps the second role and drops
the first; D630 measures whether it does both.

The cold-start exemption is applied after the gate, unchanged. Test
pins: in-band columns bit-identical before/after, out-of-band pulled
to unit, gate None == per-step. Fixture norms sit strictly off the
band edge — a hand-scaled 2.0 came out 2.0000002 in f32 and was,
correctly, treated as outside.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

2026-09-02 20:30:25 -07:00

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attention_tests.rs

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deeplift_tests.rs

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feature_ablation_tests.rs

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gradcam_tests.rs

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integrated_gradients_tests.rs

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lime_tests.rs

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lrp_tests.rs

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occlusion_tests.rs

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sae_normalize_gate.rs

feat(rtx-interpret): drift-gated decoder renormalisation (SAEConfig::normalize_gate)

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saliency_tests.rs

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shap_tests.rs

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tcav_tests.rs

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