MCNNMPanelSolver fit method

[fedemolina]

Hi!

Would it be possible to add a fit method to MCNNMPanelSolver, similar to the other solvers?

I was thinking that we could determine which solving method to use based on the provided arguments:

• If suggest_r is given, call solve_with_suggested_rank.
• If l is provided, use solve_with_regularizer.
• If K is specified, execute solve_with_cross_validation.

What do you think? I’d be happy to submit a PR for this—it should be a small modification.

[TianyiPeng]

Indeed this is nice. Would really appreciate it if you could submit a PR!