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[Reshard] Support reshard on nd mesh with same placement by LiYuRio · Pull Request #57432 · PaddlePaddle/Paddle · GitHub
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[Reshard] Support reshard on nd mesh with same placement #57432
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chenwhql
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LGTM
| for (int64_t i = 0; i < shape_of_axis; ++i) { | ||
| coord[axis] = i; | ||
| int64_t rank = coord.back(); | ||
| for (int64_t j = coord.size() - 2; j >= 0; --j) { |
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如果传入的mesh是乱序的，这里的倍数关系也没问题吗，比如[[2,5], [6,1], [4, 7], [3, 0]]
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确实有点问题，缺了一步根据下标再去mesh里取对应的id。在这个例子里，假如当前全局rank是7，用GetCurRankCoordInMesh函数获取到它在mesh中的坐标是(2, 1)，如果要获取的是第0维的子mesh，那和它在一个组的是(0, 1), (1, 1), (2, 1), (3, 1)；如果要获取第1维的子mesh，和它在同一个组的是(2, 0)和(2, 1)，然后根据下标和mesh的shape，相乘得到对应的下标，然后再取下标对应的process_id
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LGTM for set_tests_properties(test_reshard_nd_mesh PROPERTIES LABELS "RUN_TYPE=EXCLUSIVE" TIMEOUT 100)
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PR types
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Description
Pcard-73145
本PR主要支持了高维但相同mesh下不同状态间的转换，用于支持DP+MP混合并行场景。单测只为覆盖率，因为两卡不能测试全高维mesh，本地测过8卡。工作原理：
TODO：
顺便，修复高版本python下（3.9），launch的log重复打印两次的问题。