Search Results for author: Chihao Zhang

Found 7 papers, 2 papers with code

On Interpolating Experts and Multi-Armed Bandits

no code implementations14 Jul 2023 Houshuang Chen, Yuchen He, Chihao Zhang

For a vector $\mathbf{m}=(m_1,\dots, m_K)\in \mathbb{N}^K$, an instance of $\mathbf{m}$-MAB indicates that the arms are partitioned into $K$ groups and the $i$-th group contains $m_i$ arms.

Multi-Armed Bandits

Improved Algorithms for Bandit with Graph Feedback via Regret Decomposition

no code implementations30 May 2022 Yuchen He, Chihao Zhang

The problem of bandit with graph feedback generalizes both the multi-armed bandit (MAB) problem and the learning with expert advice problem by encoding in a directed graph how the loss vector can be observed in each round of the game.

Information-theoretic Classification Accuracy: A Criterion that Guides Data-driven Combination of Ambiguous Outcome Labels in Multi-class Classification

1 code implementation1 Sep 2021 Chihao Zhang, Yiling Elaine Chen, Shihua Zhang, Jingyi Jessica Li

While practitioners commonly combine ambiguous outcome labels for all data points (instances) in an ad hoc way to improve the accuracy of multi-class classification, there lacks a principled approach to guide the label combination for all data points by any optimality criterion.

Classification Multi-class Classification +1

Understanding Bandits with Graph Feedback

no code implementations NeurIPS 2021 Houshuang Chen, Zengfeng Huang, Shuai Li, Chihao Zhang

We propose the notions of the fractional weak domination number $\delta^*$ and the $k$-packing independence number capturing upper bound and lower bound for the regret respectively.

Distributed Bayesian Matrix Decomposition for Big Data Mining and Clustering

2 code implementations10 Feb 2020 Chihao Zhang, Yang Yang, Wei zhang, Shihua Zhang

Such a method should scale up well, model the heterogeneous noise, and address the communication issue in a distributed system.

Clustering Distributed Computing

Matrix Normal PCA for Interpretable Dimension Reduction and Graphical Noise Modeling

no code implementations25 Nov 2019 Chihao Zhang, Kuo Gai, Shihua Zhang

However, most of the existing methods only assume that the noise is correlated in the feature space while there may exist two-way structured noise.

Dimensionality Reduction

Bayesian Joint Matrix Decomposition for Data Integration with Heterogeneous Noise

no code implementations9 Dec 2017 Chihao Zhang, Shihua Zhang

A few of matrix decomposition methods have been extended for such multi-view data integration and pattern discovery.

Bayesian Inference Data Integration

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