It's just an abbreviated form of the nets shown in this (http://blog.otoro.net/wp-content/uploads/sites/2/2015/03/slime_rnn.png http://blog.otoro.net/wp-content

It's just an abbreviated form of the nets shown in this (http://blog.otoro.net/wp-content/uploads/sites/2/2015/03/slime_rnn.png http://blog.otoro.net/wp-content/uploads/sites/2/2015/03/sli...) image, the 3 outputs displayed correspond to the "forward", "jump", and "back" on the diagram, and the 8 inputs correspond to the agents' and balls' position vectors (which you can see in the Brain() code in slimevolley_pro.js).