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Phase 6A: Better credit is ANTI-CORRELATED with loss decrease on fixed snapshot.
DFA (Gamma=0.01) → dL=-0.0001 (only method that decreases loss)
Vec_M4 (Gamma=0.38) → dL=+0.057 (increases loss most)
Oracle BP (Gamma=1.0) → dL=+0.011 (still increases loss)
Phase 6C: Target-shift rule reduces damage but cannot make non-DFA credits productive.
The inner-product surrogate <F_l(h), a_l> is fundamentally mismatched with directional credit.
Conclusion: Case B — the primary bottleneck is the local update paradigm itself,
not the credit estimator quality or tracking/co-adaptation.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Phase 5A: Audit passes — shuffle control collapses, gains are real
Phase 5B: Transfer SUCCESS — vec_M4 beats scalar CB by +0.25 Gamma, +0.31 rho on frozen CIFAR
Phase 5C: Online FAILURE — vec does worse than scalar CB online despite better frozen credit
Core finding: bottleneck is in local surrogate / co-adaptation, not estimator quality
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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scan, vector field pilot
Key findings:
- Frozen CIFAR: estimators CAN recover credit (SB best, CB 20x > DFA)
- Online shallow: cb_eT wr=0.2 tgw=1.0 achieves S1>0, S2 marginal
- Vector credit field: 0.91-0.96 Gamma/rho on synthetic (vs 0.34 scalar CB)
- Direct vector field avoids scalar V curvature problem entirely
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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- CIFAR deltaL: s=grad_hL CE (dim=512) -> acc=17.2%, Gamma≈0
Confirms scalar value field has dimensionality bottleneck on CIFAR
- Pivot memo: direct vector credit field a_phi(h,t,s) -> R^d
Trained with perturbation-based target, avoids curvature problem
Still satisfies no hidden BP anchor constraint
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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CIFAR gap
Three new plots:
- cifar_depth_scan.png: acc/Gamma/rho vs depth for all methods
- boundary_ablation.png: s_type, tgw, warmup ratio sweeps
- synth_vs_cifar.png: dimensionality gap comparison (d=128 vs d=512)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Key findings:
- deltaL (output-layer gradient) gives best Gamma (0.562 vs 0.452 for eT)
- Concatenating h_L to s destroys credit quality (value net cheats)
- Terminal gradient matching is monotonically beneficial
- Best config: deltaL + tgw=1.0 + wr=0.05 -> Gamma=0.768, rho=0.691
- CIFAR depth scan shows no Goldilocks regime (dimensionality bottleneck)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Key finding: credit bridge advantage scales with nonlinearity.
At alpha=1.0 (full tanh), CB > SB > DFA on both Gamma and rho at all depths.
The crossover where CB surpasses SB happens around alpha=0.7-1.0.
Full 4x4x3 grid complete with 3 seeds each.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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