[hybrid] [npu] fit npu nan/inf check #35171
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wangxicoding
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PR types
Bug fixes
PR changes
Others
Describe
Fix the fused var for npu
详细问题可参考：#35144
PR #35165 解决了问题1
PR #35134 解决了问题2
本PR解决一半的问题3，针对npu，对于每一个micro step的fused grad var进行初始化.
问题3的另一半问题是，昇腾算子会使用改写自己维度之后的值，可能使padding部分的值出现nan/inf。