Junghyun Lee

Junghyun Lee

PhD Candidate in Artificial Intelligence
PhD candidate at KAIST AI, jointly advised by Se-Young Yun and Chulhee Yun. I work on interactive machine learning, theoretical aspects of LLMs, learning/optimization theory, and statistical analysis of large networks.
Fair Streaming Principal Component Analysis: Statistical and Algorithmic Viewpoint featured image

Fair Streaming Principal Component Analysis: Statistical and Algorithmic Viewpoint

Proposes a framework for performing fair PCA in memory limited, streaming setting. Sample complexity results and empirical discussions show the superiority of our approach compared …

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Junghyun Lee
Flooding with Absorption: An Efficient Protocol for Heterogeneous Bandits over Complex Networks featured image

Flooding with Absorption: An Efficient Protocol for Heterogeneous Bandits over Complex Networks

A novel problem setting where heterogeneous multi-agent bandits collaborate over a network to minimize their group regret. To deal with the high communication complexity of the …

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Junghyun Lee
Nearly Optimal Latent State Decoding in Block MDPs featured image

Nearly Optimal Latent State Decoding in Block MDPs

First theoretical analysis of model estimation and reward-free RL of block MDP, without resorting to function approximation frameworks. Lower bounds and algorithms with …

yassir-jedra
Preliminary Empirical Analyses of Clustering in Block MDPs featured image

Preliminary Empirical Analyses of Clustering in Block MDPs

We empirically validate the clustering algorithm proposed in (Jedra et al., 2022).

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Junghyun Lee
A Statistical Analysis of Stochastic Gradient Noises for GNNs featured image

A Statistical Analysis of Stochastic Gradient Noises for GNNs

Inspired from (Wang et al., ICLR'22), we provide a preliminary statistical analysis of stochastic gradient noises (SGNs) of GIN and GCN in Cora node classification task.

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Junghyun Lee
Fast and Efficient MMD-based Fair PCA via Optimization over Stiefel Manifold featured image

Fast and Efficient MMD-based Fair PCA via Optimization over Stiefel Manifold

Proposes a new MMD-based definition of fairness for PCA, then formulate fair PCA as an optimization over the Stiefel manifold. Various theoretical and empirical discussions show …

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Junghyun Lee
Preliminary Evaluation of SWAY in Permutation Decision Space via a Novel Euclidean Embedding featured image

Preliminary Evaluation of SWAY in Permutation Decision Space via a Novel Euclidean Embedding

Extend SWAY (Chen et al., 2016) to the space of permutations by proposing a new Euclidean embedding of permutations.

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Junghyun Lee
Some Loci in the Animation of a Sangaku Diagram featured image

Some Loci in the Animation of a Sangaku Diagram

In a symmetric partition of a regular n-gon into n congruent subtriangles and a regular n-gon in the center, we determine the loci of the incenter and points of tangency of the …

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Junghyun Lee