pp_save_load_amp #73749
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pp_save_load_amp #73749
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| 你的PR提交成功，感谢你对开源项目的贡献! |
| LGTM，热启的单测写在paddlenlp |
| /re-run all-failed |
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PR Category
Auto Parallel
PR Types
Bug fixes
Description
动半pp的save_load精度对齐，目前热启动存在两个问题需要修复，描述如下：
报错直接原因是：
热启动的时候，在
float16精度下(bf16也会如此)，为了防止数据下溢，反向过程中，对loss和梯度做scale，在参数更新时，即opt阶段，需要做unscale将数据缩放回来，此时会调用auto_parallel.api中的unscale_method方法，在该方法中，只要param的grad不为None，就会被添加到处理列表中，而对于非本rank的梯度，此时处于定义了但未初始化的状态，因此是未分配内存的，此时访问这些grad则会报非法访问的内存错误。报错直接原因是：
在save的时候，没有用到state_dict，而是直接保存了模型参数，未保存optimizer的参数，一方面保存的checkpoint中没有optimizer参数的信息，另一方面，导致加载时，key的名称对不上，以state_dict保存会有model.和optimizer.的前缀，后者没有。