title: Keyboard interrupt tensorflow run and save at that point
body: <p>Is there a way to break a tensorflow session by keyboard interrupt and have the option to save the model at that point? I currently leave the session running overnight but need to stop it so I can free memory for pc use during the day. As the training progresses each epoch gets slower so there are times when I may have to wait hours for the next scheduled save in the program. I'd like the functionality of being able to break into the run at any time and save from that point. I can't even find if that's possible. Would appreciate a pointer.</p>