See:https://github.com/alugowski/fast_matrix_market

We already havemmread andmmwrite that usescipy.io, butfast_matrix_market ought to be faster (and better?). Let's makefast_matrix_market an optional dependency (it has Python wheels and is on conda-forge) and figure out the best way to use it. It has docs/example of creating GraphBLAS in C++ (see here), but I think we should be able to get by with the Python bindings.

One option for our API is to addengine="auto" keyword to these functions and try to use the fastest installed library by default.

Thanks@alugowski for creatingfast_matrix_market and for bringing it to my attention.