[clevercode]

By "looping", I'm assuming you mean "recurrent"? If so, you might be interested these:

http://www.idsia.ch/~juergen/rnn.html

http://www.lsm.tugraz.at/learning/framework.html

http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.31.6...