Google Research

Proportion allocation: Simple, Distributed, and Diverse Matching with high Entropy

The 35th International Conference on Machine Learning (ICML 2018)

Abstract

Inspired by many application of bipartite matchings in online advertising and machine learning, we study a simple and natural iterative proportional allocation algorithm:
Maintain a priority score $\priority_a$ for each node $a\in\advertisers$ on one side of the bipartition, initialized as $\priority_a=1$. Iteratively allocate each node $i\in \impressions$ on the other side to eligible nodes in $\advertisers$ in proportion of their priority scores. After each round, for each node $a\in \advertisers$, decrease or increase the score $\priority_a$ based on whether it is over- or under- allocated. Our first result is that this simple, distributed algorithm converges to a $(1-\epsilon)$-approximate fractional $b$-matching solution in $O({\log n\over \epsilon^2} )$ rounds. We also extend the proportional allocation algorithm and convergence results to the maximum weighted matching problem, and show that the algorithm can be naturally tuned to produce maximum matching with {\em high entropy}. High entropy, in turn, implies additional desirable properties of this matching, e.g., it satisfies certain diversity and fairness (aka anonymity) properties that are desirable in a variety of applications in online advertising and machine learning.

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