Fix explained_variance computing variance relative to zero instead of mean#665

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amaljithkuttamath wants to merge 7 commits intodecoderesearch:mainfrom

amaljithkuttamath:fix/explained-variance-computation

Commits on Mar 26, 2026

Fix explained_variance computing variance relative to zero instead of mean
amaljithkuttamath
committed

Commits on Mar 28, 2026

Fix misleading comment: buggy formula yields very negative variance, not larger
amaljithkuttamath
committed
Guard against zero total variance and add edge-case test
amaljithkuttamath
committed
Fix ruff linting: remove unused var, use ternary
amaljithkuttamath
committed

Commits on Mar 31, 2026