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Author SHA1 Message Date
ViperEkura 8cbf3f36e2 feat: 新增训练后端工厂框架 
- BaseTrainingBackend 定义 prepare/accumulate/unwrap_model 抽象
- DDPTrainingBackend 支持全部 DDP 参数并通过 BackendFactory 注册
- unwrap_model 改为实例方法，由子类各自实现
 2026-05-24 15:15:14 +08:00