Hello everyone, I would like to call attention to this small library for sparse multidimensional arrays: https://github.com/mrocklin/sparse . This is a small library that enables some computations with sparse arrays of dimension greater than two. It relies heavily on the numpy and scipy.sparse packages. More information about capabilities and intent is available on the project's readme available through the link above. Feedback is welcome. Also, while this library is strictly single-core and in-memory, work has been done to make it compatible to work smoothly with dask.arrays (in a development branch). Best, -matthew