Journal of the Operations Research Society of China ›› 2026, Vol. 14 ›› Issue (1): 325-343.doi: 10.1007/s40305-024-00544-1

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Streaming Algorithms for Maximizing k-Submodular Functions with the Multi-knapsack Constraint

Shu-Fang Gong, Bin Liu, Qi-Zhi Fang   

  1. School of Mathematical Science, Ocean University of China, Qingdao 266100, Shandong, China
  • Received:2023-09-30 Revised:2024-03-17 Online:2026-03-30 Published:2026-03-16
  • Contact: Bin Liu E-mail:binliu@ouc.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No.11971447),and the Fundamental Research Funds for the Central Universities (No.202261097).

Abstract: The problem of maximizing submodular functions with constraints has attracted widespread attention in the past few decades. In recent years, the extensions of submodular functions were studied, such as lattice submodular functions, diminishing return submodular (DR-submodular) functions and $k$-submodular functions. A $k$ submodular function is a generalization of a submodular function to $k$ dimensions. Many machine learning problems can be cast as $k$-submodular maximization problems, for example, influence maximization with $k$ kinds of topics and sensor placement with $k$ kinds of sensors. Recently, the unprecedented growth in modern datasets makes it necessary to design streaming algorithms. This paper investigates the problem of maximizing a nonnegative normalized $k$-submodular function with the multi-knapsack constraint (also called the $d$-knapsack constraint) in the streaming model. To address this problem, we design an efficient streaming algorithm that runs in one pass, stores at most $O\left(\frac{b \log b}{\varepsilon}\right)$ elements and queries at most $O\left(\frac{d k \log b}{\varepsilon}\right)$ per element where $b$ is a constant after the normalization of the problem. This streaming algorithm also can achieve a $\left(\frac{1}{2(1+d)}-\varepsilon\right)$-approximation when the objective function $f$ is monotone and $\left(\frac{1}{3+2 d}-\varepsilon\right)$-approximation when the objective function $f$ is non-monotone.

Key words: k-Submodular maximization, Multi-knapsack constraint, Streaming algorithm, Approximation algorithm

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