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added GPU accelerated read_mtx function #85

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LouisFaure
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I bring my initial implementation of read_mtx_gpu from gpu branch of scanpy, now available at rsc.read_mtx! Here are some infos:

  • I added an option to keep the loaded matrix in cupy sparse in the new anndata.
  • By default the function uses cudf to load the mtx. There is also dask-cudf bakend option available as it might help for out of memory loading, but I do not think it is then necessary to include dask-cudf as a pip requirement (but can be otherwise).

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