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docs: whitepaper -- full backprop trains XOR on live silicon (capstone) - #1887

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The full 2-layer backprop microsequencer now trains XOR to 4/4 on a live Artix-7 (25/25 epochs, both layers learning on-chip, weight trajectory bit-exact to the independent Python model — ep0 0.000/0.551/0.936/0.232 == model). Updated the whitepaper: S3 Training adds the capstone; S4(b) now states 'flashed to a real Artix-7 and trains XOR to 4/4 across 25/25 epochs, both layers learning on-chip, bit-exact to the model' (a full forward+loss+backward+update loop on live silicon); S5 honesty resolves the 'pending JTAG re-connect' item and replaces it with the honest seed-search caveat (nextpnr-xilinx can't express a multicycle constraint → the deep shared-core path is placement-dependent; pick a stable seed — an open-toolchain limitation a commercial P&R would close directly). Docs only. Refs #1764

The full 2-layer backprop microsequencer now trains XOR to 4/4 on a live Artix-7
(25/25 epochs, both layers learning on-chip, weight trajectory bit-exact to the
independent Python model). Updated the whitepaper: S3 Training adds the capstone;
S4(b) changes 'trains XOR to 4/4 ... bitstream built and validated' to 'flashed to
a real Artix-7 and trains XOR to 4/4 across 25/25 epochs, both layers learning
on-chip, bit-exact to the model'; S5 honesty resolves the 'pending JTAG re-connect'
item and replaces it with the seed-search caveat (nextpnr-xilinx can't express a
multicycle constraint, so the deep path is placement-dependent -- pick a stable seed;
an open-toolchain limitation a commercial P&R would close directly). Docs only.

Refs #1764

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

Generated at: 2026-08-07 17:07:08 UTC

Summary

Status Count
Total Open PRs 14
PRs with Failing Checks 2
PRs with All Checks Green 12
READY 5
FAILING 2
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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gHashTag merged commit bdd3ee9 into master Aug 7, 2026
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gHashTag deleted the docs/whitepaper-capstone-silicon branch August 7, 2026 17:08
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