Replicate correlated-failure analysis across compressors

Replicate the correlated-failure analysis using each alternative compressor rather than relying primarily on PPMd-derived diversity measures.

Background

The paper uses PPMd as its primary compressor and reports a heavily subsampled diagnostic comparing PPMd with CTW, LZMA, and gzip. That diagnostic indicates broadly preserved model-pair ordering, but it does not repeat the held-out correlated-failure analysis under the alternative compressors. Consequently, the robustness of the observed association between compression-derived diversity and correlated failure across compressor choices remains unresolved.

References

The comparison is nevertheless descriptive and heavily subsampled. It does not repeat the held-out correlated-failure models under every compressor, which remains future work.

— Inferred Generative-Process Diversity Predicts Correlated Failure Across Language Models  (2609.03422 - Tieman et al., 3 Sep 2026) in Appendix, Section "Compression Distance," subsection "Compressor choice and robustness"