Random Numbers

AMDGPU.jl generates random numbers on the device through AMD's rocRAND. The quickest way to get a random ROCArray is the package-level rand/randn, which mirror Base:

using AMDGPU

AMDGPU.rand(Float32, 1024)        # uniform in [0, 1)
AMDGPU.randn(Float32, 8, 8)       # standard normal
AMDGPU.rand(Int32, 100)           # uniform integers

The standard Random in-place interface works on existing ROCArrays and fills them on the GPU:

using Random

a = ROCArray{Float32}(undef, 1024)
Random.rand!(a)
Random.randn!(a)

Seeding

Seed the device generators for reproducible results with AMDGPU.seed!:

AMDGPU.seed!(1234)

This seeds both the rocRAND generator (used by AMDGPU.rand/randn) and the GPUArrays fallback generator, so results are reproducible regardless of which path a given operation takes.