Sparse support to include vstack & hstack

I am finding the cupy.sparse packages to be very useful. For the most part, they match the scipy.sparse in provided functionality. One important feature that is currently lacking, which is supported by scipy.sparse [1], is the ability to hstack and vstack sparse arrays.

I am working to integrate cupy.sparse arrays into Dask.Array and it is necessary for the Dask.Array to be able to concatenate multiple blocks containing sparse arrays together when data is redistributed.

[1] https://docs.scipy.org/doc/scipy/reference/generated/scipy.sparse.hstack.html

[grlee77]

Please go ahead. Docstrings will have to be changed to the CuPy style and test cases added under tests/cupyx_tests/scipy_tests/sparse_tests/

On Wed, Nov 20, 2019, 8:19 AM Corey J. Nolet [e-mail] wrote:

I don’t mind contributing this feature, unless you plan to work on it, @grlee77 https://github.com/grlee77. I’ll get myself familiar with the contributor guide.

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[jakirkham]

I think this issue can be closed now (as the PR is merged). Is that right @cjnolet? 🙂