Companion to: Ordering Dominance in Low-Data NMT Regimes: Corpus Sequencing Outperforms Contradiction Magnitude (Part I: Structural Ablation Evidence) Computational artifact: Module 3. 0 — Regime Isolation and Diagnostic Stability Verification (see Related identifiers) Article 2 operationalizes the Behavioral Regimes layer (Layer 2) of the SIF diagnostic pipeline. Building on Part I — which established corpus ordering as the dominant structural factor over contradiction magnitude — the present study asks whether observed stability patterns depend on regime-level training parameters. By holding all structural components invariant and varying only regularization strength (λH, λC) and negation exposure timing, we demonstrate that distinct and reproducible operating regimes emerge as a controlled consequence of parameter selection. Three regimes are characterized across 8 structured epochs and 3 fixed random seeds: Conservative (λH=0. 10, no NEG): maximal invariant preservation Balanced (λH=0. 25, NEG@epochs 5–6): cross-article reference regime Stress-Tolerant (λH=0. 50, NEG@epochs 5–6): bounded sensitivity with history-dependent persistence All regimes preserve global embedding invariants — vocabulary-level entropy remains strictly invariant at 10. 9724 ± 0. 0000 — while differing systematically in sentence-level self-consistency and negation robustness. An artifact-level Extended Stress probe (λH=5. 0) demonstrates loss–geometry decoupling: a 10× increase in regularization strength causes a ~106% increase in training loss while embedding-level cosine geometry at epoch 8 differs by Δ < 0. 001 across all seeds. Additional controls — ordering randomization and ΔV-topology randomization (100 shuffles, 2000 bootstrap resamples) — confirm that ordering dominance (~0. 052–0. 106 Δ) exceeds ΔV-scaffold effects (~0. 011–0. 015 Δ) by approximately 7×. All findings are strictly bounded to: N=142, EN→UA, MarianMT LoRA fine-tuning, low-data protocol. No generalization to unconstrained corpora, alternative architectures, or open-domain settings is implied.
Kuzmenko et al. (Mon,) studied this question.