[AMP] Allow to switch whether to use promote strategy to choose kernel for O2 training. #53742
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This was referenced May 15, 2023
zhangting2020
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lanxianghit
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…l for O2 training. (PaddlePaddle#53742) * Allow to switch whether to use promote strategy to choose kernel for O2 training. * Fix comparing error and add unittest.
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…l for O2 training. (#53742) (#53841) Pcard-70458 cherry-pick #53742 中文文档：PaddlePaddle/docs#5882
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Pcard-70458
#51063 中将动态图AMP O2训练时，Kernel选择策略改成了
Promote to the Widest方式。这种方式会导致一些模型在默认配置下，性能显著下降。故在auto_cast接口中添加use_promote参数来控制O2训练下的Kernel选择方法是否使用Promote策略。