Hello,
i am working on recommender and i am at the first step and doing Data preperation. This is an example how my data looks like: 
I wannted to make my Algorithm understand that the names with the same 'matchid' are related together.
It's important because I want to know which Champions(Name) are related togehter and later, if I've just got one name, I want to predict the other one.
Hope someone can help me. Thnaks!