save/restore

[tazitoo]

It would be nice to save/restore a GAM object.

Future use cases for this functionality:

1. saving previous results is a big time saver when searching for best number of clusters. Initialization for k clusters can reuse a result for k-1 and just run initialization for the last cluster.
2. scoring - save the vector E from clustering.py to dramatically accelerate calculation of avg silhouette score.

[skunapuli03]

Hello @tazitoo can I get more information on this. It would be my first time contributing to open source.