Oh. My bad! In the last line, there is a function named "f", it had to be visitShow. :|
You can change it or download the new version of the notebook ;)
The output is only a number (7853 in this case). but in other neural networks can be a class or number (or sth that I don't know)
Of course we can add new variables to it. (even if it is not like others. for example number of crimes committed!)
I'm not expert in neural networks also. I would be glad if anyone can suggest a suitable network to train.