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Constrained Stochastic Nonconvex Optimization with State-dependent Markov Data

Abhishek Roy · Krishnakumar Balasubramanian · Saeed Ghadimi

Hall J (level 1) #540

Keywords: [ Dependent Data ] [ State-dependent Markov Data ] [ Projection-free Algorithm ] [ nonconvex optimization ] [ constrained optimization ]

Abstract: We study stochastic optimization algorithms for constrained nonconvex stochastic optimization problems with Markovian data. In particular, we focus on the case when the transition kernel of the Markov chain is state-dependent. Such stochastic optimization problems arise in various machine learning problems including strategic classification and reinforcement learning. For this problem, we study both projection-based and projection-free algorithms. In both cases, we establish that the number of calls to the stochastic first-order oracle to obtain an appropriately defined $\epsilon$-stationary point is of the order $\mathcal{O}(1/\epsilon^{2.5})$. In the projection-free setting we additionally establish that the number of calls to the linear minimization oracle is of order $\mathcal{O}(1/\epsilon^{5.5})$. We also empirically demonstrate the performance of our algorithm on the problem of strategic classification with neural networks.

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