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feat: GF-T madd -- fused weight update for stored-intermediates backprop - #1862

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feat: GF-T madd -- fused weight update for stored-intermediates backprop#1862
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@gHashTag gHashTag commented Aug 7, 2026

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gft_madd.t27: on_comb(w,factor,xin,k) = w - (factor*xin)*2^-k. The single shared UPDATE datapath (one multiply + power-of-2 eta exponent-shift + subtract) for a stored-intermediates backprop, reused per weight so a full 2-layer backprop fits under the ~17M ceiling. In-spec (upd, nograd) PASS. Building block toward fully-on-chip full backprop. Note: 'input' is a reserved Verilog word (used xin). docs/NOW.md updated. Refs #1764

gft_madd.t27: on_comb(w,factor,xin,k) = w - (factor*xin)*2^-k. The single shared
UPDATE datapath (one multiply + power-of-2 eta exponent-shift + subtract) for a
stored-intermediates backprop, reused per weight across frames so a full 2-layer
backprop fits under the ~17M correctness ceiling. Building block toward
fully-on-chip full backprop. In-spec tests (upd, nograd) PASS.

Note: 'input' is a reserved Verilog word, cannot be a t27 param name (used xin).

Refs #1764

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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This notebook contains session context, decisions, and artifacts for this work.

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Generated at: 2026-08-07 10:27:29 UTC

Summary

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

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  • ⚠️ 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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gHashTag merged commit ba8f3e5 into master Aug 7, 2026
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gHashTag deleted the feat/gft-madd branch August 7, 2026 10:28
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