[Random op]optimize CUDA implementation of randperm OP #40464
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PR types
Function optimization
PR changes
OPs
Describe
优化随机算子之随机排列(
paddle.randperm) 的CUDA随机数生成方式，原实现为将CPU拷贝到GPU，新的实现为使用cub库cub::DeviceRadixSort::SortPairs来实现，对OP性能有大幅提升。参考 #38611 。另外，当前默认状态暂时通过
FLAGS_use_curand=OFF关闭，以避免随机数值变换的风险。