[Enhance] Enable full precision training on Ascend NPU. #1109
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Motivation
We will support full precision training on the next generation Ascend NPU, so there is no need to enable mixed precision by default.
Modification
Determine whether the current chip supports full precision training, and automatically enable mixed precision.
BC-breaking (Optional)
Not affected.
Use cases (Optional)
We have verified the correctness on the Ascend NPU.