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feat: GF-T 2-layer backprop with scale_q eta (power-of-2) - #1861

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feat: GF-T 2-layer backprop with scale_q eta (power-of-2)#1861
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gft_xorbp2.t27: full 2-layer XOR backprop with scale_q on the updates (eta=0.125=2^-3 -> exponent shift, removes 6 eta-multipliers). In-spec PASS; GF-T sim converges XOR 4/4. Size: single-core-with-sel backprop 23.7M->21.7M, still over the ~17M ceiling (all sel-branches in HW). Finding: a stored-intermediates FSM is needed to fit (forward once, shared update datapath per frame). Sequential/coordinate backprop dynamic converges. docs/NOW.md updated. Refs #1764

gft_xorbp2.t27: the full 2-layer XOR backprop step with scale_q applied to the
weight updates -- eta=0.125=2^-3 folded into an exponent-offset shift, removing
the 6 eta-multipliers. In-spec PASS; GF-T sim converges XOR 4/4 with eta=0.125.

Size: single-core-with-sel backprop 23.7M -> 21.7M with scale_q, still over the
~17M ceiling (all 3 sel-branches synthesize into hardware). Finding: a
stored-intermediates FSM is needed to fit -- forward once (store h,e,z,dz,x),
then per-weight update frames reuse one shared update datapath. The
sequential/coordinate backprop dynamic converges (verified in sim).

Refs #1764

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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PR Dashboard

Generated at: 2026-08-07 10:20:27 UTC

Summary

Status Count
Total Open PRs 12
PRs with Failing Checks 0
PRs with All Checks Green 12
READY 5
FAILING 0
PENDING 0

Seal Status

  • ⚠️ STALE -- sha256(compiler.rs)=4c1aaad5309a != manifest seal=87e5cbd3ad94.
    The committed NMSE numbers were certified against an older compiler.rs.
    Run scripts/reseal-check.sh locally for the two-step reseal command (advisory; not a merge gate).

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📓 NotebookLM Notebook linked to this PR

This notebook contains session context, decisions, and artifacts for this work.

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gHashTag merged commit 861f379 into master Aug 7, 2026
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gHashTag deleted the feat/gft-xorbp2 branch August 7, 2026 10:21
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