The random ranking is assigned after every `pio train` so if you have not
trained in-between, they will be the same. Random is not really meant to do
what you are using it for, it is meant to surface items with no data—no
primary events. This will allow some to get real events and be recommended
Dear pio developers and users:
I have been using predictionIO and Universal Recommender for a while.
In universal recommender engiene.json, there is a configuration field
`rankings`, and one of the option is random. Initially I thought it
would give each item without any related event some
