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Ecosystem update — September 2026

Python-native extension outside the frozen R contract

The companion Python package gpbiometricspy now includes a fully exact-main-certified crossed participant–item Gaussian hierarchical location–scale model with one location random slope for each crossed factor.

This addition is intentionally outside the frozen gpbiometrics 2.0.0 semantic-parity contract. It does not add a new R export, modify the gpbiometrics API, or change the scientific/release record of this R package. The frozen R surface remains the reference against which gpbiometricspy preserves 406/406 semantic parity; the crossed random-slope model is later additive Python-native development.

The new method estimates participant- and item-specific heterogeneity in conditional associations while retaining crossed residual-scale heterogeneity, explicit population-versus-conditional prediction semantics, fail-closed design checks, and deterministic reproducibility certificates. It is not a causal model, artifact detector, sensor-validity score, or latent-state inference engine.

Certified gpbiometricspy PR #129 is pinned to merge SHA d078e0366ace49c3ebeb2f6800bad6394d70631e: 14/14 exact-main push workflow families, 12/12 OS/Python matrix lanes, 782/782 tests, 14,015/14,015 statements, and 6,757/6,776 raw branches (99.7196%). The 19 remaining branch arcs are the unchanged audited structural-debt set, with zero unexpected, stale, or unaudited debt.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.