Support `restoreBestWeights`#8500

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PLtier wants to merge 8 commits intotensorflow:masterfrom

PLtier:restore-best-weights

Commits on Jan 7, 2025

feature: add support for restoreBestWeights
PLtier
committed

Commits on Jan 20, 2025

fix(callbacks): private encapsulation for bestEpoch
PLtier
committed

Commits on May 10, 2025

Merge branch 'master' into restore-best-weights
PLtier
authored