35 citations · 107 across the 26 of their papers we have counts for
3 papers · 1 filter
Identifying Sparse Low-Dimensional Structures in Markov Chains: A Nonnegative Matrix Factorization Approach
Mahsa Ghasemi, Abolfazl Hashemi, Haris Vikalo +1
We consider the problem of learning low-dimensional representations for large-scale Markov chains. We formulate the task of representation learning as that of mapping the state spa…
Performance-Complexity Tradeoffs in Greedy Weak Submodular Maximization with Random Sampling
Abolfazl Hashemi, Haris Vikalo, Gustavo de Veciana
Many problems in signal processing and machine learning can be formalized as weak submodular optimization tasks. For such problems, a simple greedy algorithm (\textsc{Greedy}) is g…
Submodular Observation Selection and Information Gathering for Quadratic Models
Abolfazl Hashemi, Mahsa Ghasemi, Haris Vikalo +1
We study the problem of selecting most informative subset of a large observation set to enable accurate estimation of unknown parameters. This problem arises in a variety of settin…