Doesn't the GPU Coder support singleton expansion of ARRAYFUN?

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Shogo Muramatsu 2021-9-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1460484-doesn-t-the-gpu-coder-support-singleton-expansion-of-arrayfun

评论： Shogo Muramatsu 2021-10-2

采纳的回答： Joss Knight

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I have a question about SINGLETON EXPANSION for ARRAYFUN on GPU.

For gpuArrays, @times with ARRAYFUN and direct calculation on M-file both work fine.

However, MEX generated by GPU Coder from a code using ARRAYFUN does not seem to perform SINGLETON EXPANSION well.

Doesn't the GPU Coder support SINGLETON EXPANSION of ARRAYFUN?

Shogo MURAMATSU

Sample code

function Y = arrayfuntest(m,X) %#codegen

Y = arrayfun(@times,m,X);

%Y = m.*X;

end

Code generation for ARRAYFUN

Code generation for a direct operation

Preparation of arrays

m = gpuArray(single([1;-1;1]))
X = gpuArray(rand(3,'single'))

Execution with M-file

Y = arrayfuntest(m,X)

MEX Generation

cfg = coder.gpuConfig('mex');
nChs = 64;
datatype = 'single';
aM = coder.typeof(gpuArray(cast(0,datatype)),[nChs 1],[1 0]); 
aX = coder.typeof(gpuArray(cast(0,datatype)),[nChs nChs],[1 1]); 
cfg.DynamicMemoryAllocation = 'Off';
cfg.GenerateReport = true;
codegen -config cfg -o arrayfuntest_mex arrayfuntest.m -args { aM, aX }

Execution with MEX-file

Y = arrayfuntest_mex(m,X)

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采纳的回答

Joss Knight 2021-10-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1460484-doesn-t-the-gpu-coder-support-singleton-expansion-of-arrayfun#answer_800024

Support for dimension expansion is actually restricted to the GPU version of arrayfun, and GPU Coder supports the CPU version's syntax. So the answer is no, it doesn't support dimension expansion.

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Shogo Muramatsu 2021-10-2

Thank you for the clear answer.

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