Unify the gpu implementation of stack and unstack to reuse the optimization. #49748
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…zation. (PaddlePaddle#49748) * Unify the gpu implementation of stack and unstack to reuse the optimization. * Optimize the cuda implementation of unstack. * Use GpuMemcpyAsync instead of memory::Copy. * Fix error of calculating the index. * Use FastDivMod to further imporve the performance of unstack.
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PR types
Performance optimization
PR changes
OPs
Describe
统一stack、unstack实现，并优化unstack部分计算。