Sparse for gpuArray problem

Question

shahrizan jamaludin 2016-3-8

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https://ww2.mathworks.cn/matlabcentral/answers/272084-sparse-for-gpuarray-problem

评论： Joss Knight 2016-3-21

Hello, i got problem with the code below:

pix=pix1; %pix1 is gpuArray with size 5194x2
P1=pix(:,2); %gpuArray with size 5194x1
P2=pix(:,1); %gpuArray with size 5194x1
spr=sparse(P1,P2,1,size(A,1),size(A,2));
%Error using gpuArray/sparse. Too many input arguments

but if i put "gather", it shows no error.

pix=pix1; %pix1 is gpuArray with size 5194x2
pix=gather(pix); % double with 5194x2
P1=pix(:,2); %double with size 5194x1
P2=pix(:,1); %double with size 5194x1
spr=sparse(P1,P2,1,size(A,1),size(A,2));

What went wrong? Any limitation for sparse in gpuArray? My GPU is 4GB

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Answer 1

Joss Knight 2016-3-8

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https://ww2.mathworks.cn/matlabcentral/answers/272084-sparse-for-gpuarray-problem#answer_212814

Yes, in R2015b the five-argument form of sparse is not supported for gpuArray. See help gpuArray/sparse.

Now that it's out you can upgrade to R2016a, which does support the five-argument form of gpuArray/sparse.

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shahrizan jamaludin 2016-3-8

Thanks for your help.

Joss Knight 2016-3-21

在 MATLAB Online 中打开

By the way, in R2015b you can use accumarray, which has very much the same syntax as the 5-argument form of sparse. All you do is combine i and j into one matrix, also combine m and n into one size input, and specify the 6th argument as true (output sparse matrix), namely:

S = accumarray([i j], s, [m n], [], [], true);

is equivalent to

S = sparse(i, j, s, m, n);

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