[dask] Aggregate distributed validation metrics, fix dask early stopping#7290

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szjunma wants to merge 17 commits into

lightgbm-org:mainfrom

szjunma:dask-early-stopping

Commits on Jul 10, 2026

[dask] Aggregate distributed validation metrics
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[dask][tests] parametrize distributed validation metric tests
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[dask] gate zero-weight fatal check on distributed eval path
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[dask] document distributed validation metric aggregation in fit docstrings
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[ci] add desc annotations to enable_distributed_additive_eval_metric parameter
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[dask] remove enable_distributed_additive_eval_metric flag, make C++ aggregation unconditional
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[dask] remove unused config_ member from metric constructors (PR #7290)
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[dask] filter eval_class_weight to classes present on each worker
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[dask] add type annotations for mypy in _train_part
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Revert "[dask] add type annotations for mypy in _train_part"
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[dask] extend distributed metric aggregation to all built-in metrics
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fix auc_mu j_start offsets, NDCG/MAP zero-data return, and _compute_auc_mu alignment
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revert non-functional j_start refactor in AucMuMetric
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fix gathered score layout for distributed auc_mu
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[dask] add early stopping global-metric regression test, refactor ranking helpers
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[dask] infer ranker default ndcg as aggregated, guard xentropy zero-weight fatal
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fix pre-commit lint failures (cpplint, ruff, mypy, typos)
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