MAGMA Forum

I'm using SVD PyTorch, which on the GPU uses MAGMA dgesdd as far as I know. In some cases, my inputs contain NaNs, in which case I get

Intel MKL ERROR: Parameter 4 was incorrect on entry to SLASCL.

Now, this confuses me a bit, since MKL is a CPU library so far as I know, so how is it possible to get error messages from MKL when executing stuff on the GPU?

MAGMA is a hybrid CPU-GPU library. It does some computation on the CPU, and some on the GPU, trying to overlap those two computations and leverage the strengths of each. Thus, it can run into MKL errors on the CPU.

As for your error, gesdd cannot work if there are NaNs. The SVD is not defined in that case.

-mark

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