Constrained submodular maximization problems encompass a wide variety of applications, including personalized recommendation, team formation, and revenue maximization via viral marketing. The massive instances occurring in modern day applications can render existing algorithms prohibitively slow, while frequently, those instances are also inherently stochastic. Focusing on these challenges, we revisit the classic problem of maximizing a (possibly non-monotone) submodular function subject to a knapsack constraint. We present a simple randomized greedy algorithm that achieves a $5.83$ approximation and runs in $O(n \log n)$ time, i.e., at least a factor $n$ faster than other state-of-the-art algorithms. The robustness of our approach allows us to further transfer it to a stochastic version of the problem. There, we obtain a $9$-approximation to the best adaptive policy, which is the first constant approximation for non-monotone objectives. Experimental evaluation of our algorithms showcases their improved performance on real and synthetic data.

本研究提出了一种基于随机贪心算法解决非单调子模函数下的背包约束问题的方法，该算法实现了5.83近似和O(nlogn)时间复杂度；并将其转移到随机版本的问题，得到了首个非单调目标的常数近似，实验表明该方法在实际和合成数据上的性能得到了改进。

针对背包约束的快速自适应非单调子模型最大化