  Many problems in computer vision and recommender systems involve low-rank
matrices. In this work, we study the problem of finding the maximum entry of a
stochastic low-rank matrix from sequential observations. At each step, a
learning agent chooses pairs of row and column arms, and receives the noisy
product of their latent values as a reward. The main challenge is that the
latent values are unobserved. We identify a class of non-negative matrices
whose maximum entry can be found statistically efficiently and propose an
algorithm for finding them, which we call LowRankElim. We derive a
$\DeclareMathOperator{\poly}{poly} O((K + L) \poly(d) \Delta^{-1} \log n)$
upper bound on its $n$-step regret, where $K$ is the number of rows, $L$ is the
number of columns, $d$ is the rank of the matrix, and $\Delta$ is the minimum
gap. The bound depends on other problem-specific constants that clearly do not
depend $K L$. To the best of our knowledge, this is the first such result in
the literature.
