How to work with and load/save sparse compressed matrices? (numir, mir.sparse)
ilyayaroshenko at gmail.com
Mon Oct 5 03:21:22 UTC 2020
On Tuesday, 29 September 2020 at 04:52:11 UTC, Shaleen Chhabra
> I wish to use load / save for sparse compressed matrices using
> import mir.sparse;
> auto sp = sparse!double(5, 8);
> auto crs = sp.compress;
> How can I save/load sparse compressed arrays in `npz` format?
> (format: ``csc``, ``csr``, ``bsr``, ``dia`` or coo``)
Mir doesn't have I/O support for sparse tensors for now.
> how can i again decompress the compressed sparse array to dense?
import mir.ndslice.allocation: slice;
// for DOK:
auto dense = slice(sp);
For crs you may need to iterate with byCoordinateValue
and initialize the dense slice.
To estimate the raw length one may need to iterate all rows and
get the maximum of the last element indices.
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