- New Aenebris.ML.Loader module: pure ByteString -> Either ParseError Ensemble
parser for LightGBM v4 plain-text models. Header / tree-blocks / trailing-
section state machine; converts split-arrays + leaf-arrays into the unified
Tree SoA via unifyChild + complement; rejects non-v4, multi-class, and
is_linear=1; extracts embedded sigmoid scale and bare average_output flag;
runs validateEnsemble before returning.
- Frozen test fixtures under test/fixtures/ml/ (tiny_lgbm_v4.txt,
stump_lgbm_v4.txt) hand-crafted from the v4 spec annotated example. CI runs
against these with zero Python dependency.
- scripts/regen_lgbm_fixture.py: uv-runnable PEP 723 script that retrains a
tiny binary GBDT and writes to a separate
test/fixtures/ml/regen_sample_v4.txt so the frozen fixtures stay pristine.
- 30 new mlLoaderSpec tests covering happy path, header rejection, sigmoid
extraction, average_output, tree-level rejection, feature_names with '=',
and ParseError reporting. 238 total examples passing, 0 GHC warnings on
Loader.
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