How can I find the rank for each user?

I am having trouble understanding on how can I sort the users according to their rank. I'm using the Convolutional Neural Network (CNN) for developing iris recognition system and I've got the output of the Softmax classifier from the left and right iris. What I'm going to do is using one of the ranking fusion methods (e.g. the highest rank method, the Borda count method, and the logistic regression method) to fuse the output of both the left and right iris. I completely understand each method how does it work, but I faced problem on how can I find the initial rank for each user. In other words, How can I find the rank for each user before I fed them to any one of the ranking methods?. Please, any explanation and idea on this will be highly appreciated. Thank you in advance.

[Greg Heath]

What inputs determine rank of an iris???