This is a special version of CVXPY designed for matrix-free convex optimization. See these papers for further details on matrix-free convex optimization. See the CVXPY site for more information on CVXPY itself.
From the perspective of the user, matrix-free CVXPY is exactly the same as standard CVXPY except it has an additional solver "SCS_MAT_FREE", which is a matrix-free version of SCS. The solver is preliminary and not at all optimized.
To install matrix-free CVXPY, clone this Github repository and run
python setup.py install in the repository directory.
You must also install the matrix-free SCS solver from source (repository here).
See this repository for instructions on installing a faster version of the matrix-free SCS solver.