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[SYSTEMDS-3375] CUDA 11.x / CUDNN 8.x support

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This changeset brings CUDA11 and CUDNN8 support to SystemDS. All required API changes to successfully compile & run have been applied. A few library functions are still on the ToDo...

JCuSparse SpGEMM wrong parameter handling

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Hello! When using the latest JCuda to do a sparse matrix multiplication, the parameters externalBuffer1 of cusparseSpGEMM_workEstimation(...) and externalBuffer2 of cusparseSpGEMM_compute(...) are checked for being NULL [1], [2] and an...

A fix on the conditional that is now not applied in the outer product template, needs more work to get it right (see discussion on commit https://github.com/tugraz-isds/systemds/commit/4d085ad5c9df30c54d4de7f412f327df5cb7b84b#comments)

I looked at the bug :bug: @Shafaq-Siddiqi mentioned. I didn't find where to fix it, but I'll leave some more information for somebody to fix it: I reduced the DML...

Context Manager for Python Bindings

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I would prefer some other way to shutdown the server than `shutdown`. Fist of all a check is missing since we only start a subprocess if no SystemDS instance is...