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Consolidate the distributed fused attention tests to shared input generation and execition logic.
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* corrected RS overlap BF16 output clashing with Float8Tensor constructor
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* Add a compile option to compile activation kernels with fast math
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* Fix
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* support AG overlap in sequence-parallel Linear forward and RS overlap in sequence-parallel Linear backward
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Take token count quantization of fused attention into consideration for CP results correction (#1396)

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