Use 8 estimators for small and medium KumoTabular in benchmarks

[JingangQu]

#983 raised every size to 16 estimators. This PR corrects it and sets 8 estimators by default for small and medium KumoTabular in the TabArena/BeyondArena, ScoringBench and TALENT benchmarks. Large keeps 16.

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📒 Files selected for processing (3)

• benchmark/tabular/model.py
• benchmark/tabular/scoringbench/models.py
• benchmark/tabular/talent/models.py

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📝 Summary

Summary by CodeRabbit

• Updates
  • Small and medium Kumo tabular benchmark configurations now use 8 estimators instead of 16.
  • Large Kumo tabular benchmark configurations remain at 16 estimators.

Walkthrough

The medium model default and small and medium benchmark configurations now use 8 estimators instead of 16. The large configuration and other described settings are unchanged.

Changes

KumoTabular estimator count

Layer / File(s)	Summary
Set estimator counts benchmark/tabular/model.py, benchmark/tabular/scoringbench/models.py, benchmark/tabular/talent/models.py	The medium model default and small and medium benchmark configurations now use 8 estimators. The large configuration and other described settings are unchanged.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~4 minutes

Merge Risk: ⚪ Minimal · up to bad1e

The estimator defaults and benchmark configurations match the stated size-specific counts. No merge-blocking issue was identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 3…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly states the main change: using 8 estimators for small and medium KumoTabular benchmark configurations.
Description check	✅ Passed	The description accurately explains the estimator change, affected benchmarks, and that large KumoTabular remains at 16 estimators.

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