On Mon, Apr 23, 2018 at 9:02 AM, Hameer Abbasi <einstein.edison@gmail.com> wrote:
Hello SciPy-Dev,
I submitted a pull request <https://github.com/pydata/sparse/pull/141> to pydata/sparse <https://github.com/pydata/sparse> (I’m one of its maintainers) about always keeping a COO array in canonical form.
We (Matthew Rocklin, CJ Carey and I) were having a discussion there about whether it makes sense to allow sparse COO arrays to be in non-canonical order. In short, canonical form is:
- Coordinates are sorted in lexographical order, i.e., the same order they would appear in in a C-contiguous array. - There are no duplicate coordinates allowed. - There are no stored coordinates with a zero value.
With this in mind, what are the SciPy developers’ opinions on this? Does allowing COO arrays to be in non-canonical form make sense? Feedback welcome on the PR or the mailing list.
Your PR as it is now makes sense to me. Thanks for keeping this list in the loop on important decisions about sparse arrays. Cheers, Ralf