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Patches:
- main(): add --penalty_lam (separate from CB's bridge temperature args.lam)
- train_dfa block update (line 195): add penalty_lam * (f_l**2).sum(-1).mean()
- train_state_bridge block update (line 326): same penalty
- train_credit_bridge block update (line 533): same penalty
Codex round 38 GO STAGE: keep penalty separate from CB lam, blocks-only,
sanity-check that hidden_norms remain nontrivial (not silencing the blocks).
2-epoch smoke (results/round38_smoke_sbcb_pen) passes the silencing check:
SB ||h_L||=229, CB ||h_L||=1258, both nontrivial. Deep cosines positive across
all layers for SB ([0.28, 0.25, 0.23]) and rising for CB ([0.04, 0.08, 0.13, 0.15]).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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- experiments/cifar_resmlp.py: add --methods filter and --random_targets flag;
extend compute_diagnostics to log hidden_norms_per_layer and bp_grad_norms_per_layer
- paper/main.tex §3 ¶1: broaden random-target finding to all 3 fixed-feedback methods
(DFA: ||h_L||=14510, SB: ||h_L||=6225, CB: ||h_L||=19974 at ep 3, all at chance acc)
- paper/main.tex Appendix J: extended with cross-method smoke-test table
This generalizes the §3 mechanism story from 'DFA-specific' to 'all 3 audited
fixed-feedback local-credit methods'. Combined with rounds 32-34, the proximate
cause of Mode 1 (a) is now well-localized:
- Not requires residual skip (round 33 H2 walkback)
- Not requires task signal (round 34 random targets, DFA)
- Not DFA-specific (round 35 random targets, SB+CB)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Debug phase. Toy LQ experiments (3 seeds) complete with terminal gradient matching.
Credit bridge matches state bridge on linear system (~0.94 cosine).
CIFAR experiments in progress.
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