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  1. Apache Arrow
  2. ARROW-4226

[Format][C++] Add CSF sparse tensor support

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      https://github.com/apache/arrow/pull/2546#pullrequestreview-156064172

      Perhaps in the future, if zero-copy and future-proof-ness is really what we want, we might want to add the CSF (compressed sparse fiber) format, a generalisation of CSR/CSC. I'm currently working on adding it to PyData/Sparse, and I plan to make it the preferred format (COO will still be around though).

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            rokm Rok Mihevc
            mrkn Kenta Murata
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