Need tutorial how to build evaluator for "COMPLIMENTARY PURCHASE" template engine

[Alexey Grachev <al...@turbinekreuzberg.com>]

Hello,

I use "complimentary purchase".

Its based on a-priori algorithm, so the evaluation couldnt use the same 
metrics as for

classification template engine. Unfortunatelly, pio provided only one 
tutorial so far:

https://predictionio.apache.org/evaluation/metricbuild/


Can someone give me please an advice, how do I build evaluator in PIO 
for complimentary purchase?

Which metrics should I use?


Thanks a lot!