How does the Mastery System determine what role I am playing?

In one of Redmercy's videos he said that the rank you will get depends on how well you do regarding the average stats of the champion you are playing in the role you are playing him. My question is: How does the System determine what role I am playing? (e.g. Yasuo Support, Soraka Top, Sona ADC)? Thank you :3
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