Showing sparse arrays goes wrong

[maleadt]

julia> using CuArrays

julia> using CuArrays.CURAND

julia> using SparseArrays

julia> CuArrays.CUSPARSE.CuSparseMatrixCSR(sprand(10,10,0.1))
[ Info: Building the CUDAnative run-time library for your sm_35 device, this might take a while...
10×10 CuArrays.CUSPARSE.CuSparseMatrixCSR{Float64}:
Error showing value of type CuArrays.CUSPARSE.CuSparseMatrixCSR{Float64}:
ERROR: getindex not defined for CuArrays.CUSPARSE.CuSparseMatrixCSR{Float64}

From https://discourse.julialang.org/t/initializing-sparse-matrices-with-cuarrays-jl/21062

[carstenbauer]

ERROR: getindex not defined for CuArrays.CUSPARSE.CuSparseMatrixCSR{Float64}

Doesn't this also make the arrays basically unusable (besides the displaying issue)? After all getindex is one of the mandatory functions of the AbstractArray interface.

[maleadt]

No, you never actually want to index scalar elements from the CPU side. We call into vectorized CUSPARSE methods using multiple dispatch, which doesn't rely on cusparse, or (in the case of other CUDA array types) convert them to a device-side object such as CuDeviceArray that does implement (device-side!) getindex.