Fix sync_bn error in fp16 amp-o2 #40943
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sync_batch_nrom 在 fp16 混合精度训练模式下，仅输入x可以转换为fp16，其余参数保持为fp32，在fp16 amp-o2模式下，amp.decorate做网络参数转换时需跳过SyncBatchNorm。