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[wip] Use philox for faster sampling on GPU. #12223

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[wip] Use philox for faster sampling on GPU. #12223

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6 changes: 4 additions & 2 deletions src/tree/gpu_hist/sampler.cu
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Expand Up @@ -11,6 +11,8 @@
#include <thrust/transform.h>
#include <thrust/version.h>

#include <cuda/std/random>

#include "../../common/nvtx_utils.h"

#if CCCL_MAJOR_VERSION > 3 || (CCCL_MAJOR_VERSION == 3 && CCCL_MINOR_VERSION >= 2)
Expand Down Expand Up @@ -38,8 +40,8 @@ class RandomWeight {
explicit RandomWeight(std::size_t seed) : seed_(seed) {}

XGBOOST_DEVICE float operator()(std::size_t i) const {
thrust::default_random_engine rng(seed_);
thrust::uniform_real_distribution<float> dist;
cuda::std::philox4x64 rng{seed_};
cuda::std::uniform_real_distribution<float> dist;
rng.discard(i);
return dist(rng);
}
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