The Learning To Rank result is treated as an input to a function

[Dawn]

Hi all:

How to embed a linear formula calculation in the outer layer of Learning To 
Rank?
We need to do a calculation on the score of Learning To Rank.

For example，normal use of Learning To Rank looks like this，I'm going to get a 
score:

rq={!ltr model=myModel reRankDocs=100}

I want the score evaluated at Learning To Rank to be the input to a 
function，How do I use it？