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在单个机器上模拟多机并行，程序不会退出

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## Summary 在测试下面的 `2 机 2 卡` 混合并行脚本 `test.py` 时： ```python import oneflow as flow P01 = flow.placement(type="cpu", ranks=[0, 1]) P23 = flow.placement(type="cpu", ranks=[2, 3]) # 模型第一阶段在第 0 和第 1...

[Feature] Support FP8 target model during training

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### Checklist - [x] 1. If the issue you raised is not a feature but a question, please raise a discussion at https://github.com/sgl-project/SpecForge/discussions/new/choose Otherwise, it will be closed. - [x]...