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PR Category
Auto Parallel
PR Types
Bug fixes
Description
修复动静半自动并行中,针对enable_delay_scale_loss的行为。在自动并行中,默认使用enable_delay_scale_loss的逻辑。
动态图手动的enable_delay_scale_loss的逻辑中,会先在sp/dp/sharding并行组对grad进行规约,再对规约的结果除以acc的step数。但目前自动并行的实现中,先对每个add的grad除以acc的step数,再在sp/dp/sharding并行组对grad进行规约。这种做法在grad较小时会有数值精度损失的风险。
因此,本pr:
(1)适配动态图自动并行的逻辑,强制在优化器更新前触发通信,然后对梯度进行scale
(2)适配静态图自动并行的逻辑,适配auto_parallel_gradient_merge_pass,将grad的scale移动到reduce通信后进行
Pcard-76459