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Google 2020 White Paper

Title: Evaluation of Cohort Algorithms for the FLoC API

Authors: Deepak Ravichandran & Sergei Vassilvitskii (Google Research & Ads)

Abstract/Summary: The Federated Learning of Cohorts (FLoC) API is a privacy preserving mechanism proposed within the Chrome Privacy Sandbox, for enabling interest based advertising. The API is based on the notion of cohorts - groups of users with similar interests. In this paper we evaluate different methods for generating cohorts, showing clear trade-offs between privacy and utility. Using proprietary conversion data, we demonstrate that generating cohorts based on common interests can significantly improve quality over random user groupings. In fact, we achieve a 350% improvement in recall and 70% improvement in precision at very high anonymity levels compared to random user grouping.

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