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The Best Optimizer Depends on Batch Size

A new arXiv paper challenges the assumption that optimizer performance is batch-size invariant, demonstrating empirically that the best optimizer for language model pretraining shifts with batch size—even after rigorous hyperparameter tuning.

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arXiv Machine Learning

Oct 9, 2026

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01 The best optimizer for language model pretraining changes with batch size even after extensive hyperparameter tuning.

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