Search Results for author: Sungik Choi

Found 10 papers, 4 papers with code

HFI: A unified framework for training-free detection and implicit watermarking of latent diffusion model generated images

no code implementations30 Dec 2024 Sungik Choi, Sungwoo Park, Jaehoon Lee, SeungHyun Kim, Stanley Jungkyu Choi, Moontae Lee

Specifically, by viewing the autoencoder of LDM as a downsampling-upsampling kernel, HFI measures the extent of aliasing, a distortion of high-frequency information that appears in the reconstructed image.

Diffusion based Semantic Outlier Generation via Nuisance Awareness for Out-of-Distribution Detection

no code implementations27 Aug 2024 Suhee Yoon, Sanghyu Yoon, Hankook Lee, Ye Seul Sim, Sungik Choi, Kyungeun Lee, Hye-Seung Cho, Woohyung Lim

Out-of-distribution (OOD) detection, which determines whether a given sample is part of the in-distribution (ID), has recently shown promising results through training with synthetic OOD datasets.

Out-of-Distribution Detection Out of Distribution (OOD) Detection

Partial-Multivariate Model for Forecasting

no code implementations19 Aug 2024 Jaehoon Lee, Hankook Lee, Sungik Choi, Sungjun Cho, Moontae Lee

When solving forecasting problems including multiple time-series features, existing approaches often fall into two extreme categories, depending on whether to utilize inter-feature information: univariate and complete-multivariate models.

model

Learning Equi-angular Representations for Online Continual Learning

1 code implementation CVPR 2024 Minhyuk Seo, Hyunseo Koh, Wonje Jeung, Minjae Lee, San Kim, Hankook Lee, Sungjun Cho, Sungik Choi, Hyunwoo Kim, Jonghyun Choi

Online continual learning suffers from an underfitted solution due to insufficient training for prompt model update (e. g., single-epoch training).

Continual Learning

Projection Regret: Reducing Background Bias for Novelty Detection via Diffusion Models

no code implementations NeurIPS 2023 Sungik Choi, Hankook Lee, Honglak Lee, Moontae Lee

Based on our observation that diffusion models can \emph{project} any sample to an in-distribution sample with similar background information, we propose \emph{Projection Regret (PR)}, an efficient novelty detection method that mitigates the bias of non-semantic information.

Novelty Detection Perceptual Distance

Observation-Guided Diffusion Probabilistic Models

1 code implementation CVPR 2024 Junoh Kang, Jinyoung Choi, Sungik Choi, Bohyung Han

We propose a novel diffusion-based image generation method called the observation-guided diffusion probabilistic model (OGDM), which effectively addresses the tradeoff between quality control and fast sampling.

Denoising Image Generation

Transferring Pre-trained Multimodal Representations with Cross-modal Similarity Matching

no code implementations7 Jan 2023 Byoungjip Kim, Sungik Choi, Dasol Hwang, Moontae Lee, Honglak Lee

Despite surprising performance on zero-shot transfer, pre-training a large-scale multimodal model is often prohibitive as it requires a huge amount of data and computing resources.

Language Modeling Language Modelling +1

Unsupervised Visual Representation Learning via Mutual Information Regularized Assignment

1 code implementation4 Nov 2022 Dong Hoon Lee, Sungik Choi, Hyunwoo Kim, Sae-Young Chung

This paper proposes Mutual Information Regularized Assignment (MIRA), a pseudo-labeling algorithm for unsupervised representation learning inspired by information maximization.

Linear evaluation Pseudo Label +2

Novelty Detection Via Blurring

no code implementations ICLR 2020 Sungik Choi, Sae-Young Chung

Conventional out-of-distribution (OOD) detection schemes based on variational autoencoder or Random Network Distillation (RND) have been observed to assign lower uncertainty to the OOD than the target distribution.

Novelty Detection Out of Distribution (OOD) Detection

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