Binary classification is used where you have data that falls into two possible classes - a classic example would be “hotdog” or “not hotdog” ((if you don’t get the hot dog reference then watch this).

Hopefully, everyone agrees that you should have some form of logging in your production systems. I would also hope that nowadays everyone agrees that using some kind of centralised logging system that you can access without SSHing onto production boxes is the right way to do things.

You can try it out for yourself using this link - just hold a Sudoku puzzle up to your WebCam. Or try it on your mobile phone - it should work pretty well in a mobile browser.