Learning and Testing Junta Distributions with Subcube Conditioning

04/26/2020
by   Xi Chen, et al.
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We study the problems of learning and testing junta distributions on {-1,1}^n with respect to the uniform distribution, where a distribution p is a k-junta if its probability mass function p(x) depends on a subset of at most k variables. The main contribution is an algorithm for finding relevant coordinates in a k-junta distribution with subcube conditioning [BC18, CCKLW20]. We give two applications: 1. An algorithm for learning k-junta distributions with Õ(k/ϵ^2) log n + O(2^k/ϵ^2) subcube conditioning queries, and 2. An algorithm for testing k-junta distributions with Õ((k + √(n))/ϵ^2) subcube conditioning queries. All our algorithms are optimal up to poly-logarithmic factors. Our results show that subcube conditioning, as a natural model for accessing high-dimensional distributions, enables significant savings in learning and testing junta distributions compared to the standard sampling model. This addresses an open question posed by Aliakbarpour, Blais, and Rubinfeld [ABR17].

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