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Hyunsoo Cho

14 accepted papers

2026

A More Word-like Image Tokenization for MLLMs

CVPR 2026

Modern multimodal large language models (MLLMs) typically keep the language model fixed and train a visual projector that maps the pixels into a sequence of tokens in its embedding space, so that images can be presented in essentially the same form as text. However, the language model has been optim

Cited by 0SourcecodeScholar
2026

QUATRO: Query-Adaptive Trust Region Policy Optimization for LLM Fine-tuning

ICML 2026poster

GRPO-style reinforcement learning (RL)-based LLM fine-tuning algorithms have recently gained popularity. Relying on heuristic trust-region approximations, however, they can lead to brittle optimization behavior, as global importance-ratio clipping and group-wise normalization fail to regulate sample…

Cited by 0SourceScholar
2025

GOODLIAR: A Reinforcement Learning-Based Deceptive Agent for Disrupting LLM Beliefs on Foundational Principles

ACL 2025finding

Large Language Models (LLMs) often succumb to adversarial prompts, a phenomenon popularly known as “jailbreaking.” While jailbreaking primarily targets short-term noncompliance with predefined policies, we argue that a deeper vulnerability lies in altering an LLM’s fundamental axiomatic beliefs, suc…

2024

Adaptive Contrastive Decoding in Retrieval-Augmented Generation for Handling Noisy Contexts

EMNLP 2024finding

When using large language models (LLMs) in knowledge-intensive tasks, such as open-domain question answering, external context can bridge the gap between external knowledge and the LLMs’ parametric knowledge.Recent research has been developed to amplify contextual knowledge over the parametric knowl…

2023

CELDA: Leveraging Black-box Language Model as Enhanced Classifier without Labels

ACL 2023long

Utilizing language models (LMs) without internal access is becoming an attractive paradigm in the field of NLP as many cutting-edge LMs are released through APIs and boast a massive scale. The de-facto method in this type of black-box scenario is known as prompting, which has shown progressive perfo…

2023

Finding the Global Semantic Representation in GAN through Fréchet Mean

ICLR 2023poster

The ideally disentangled latent space in GAN involves the global representation of latent space using semantic attribute coordinates. In other words, in this disentangled space, there exists the global semantic basis as a vector space where each basis component describes one attribute of generated…

Cited by 3SourcePDFScholar
2023

MAGANet: Achieving Combinatorial Generalization by Modeling a Group Action

ICML 2023poster

Combinatorial generalization refers to the ability to collect and assemble various attributes from diverse data to generate novel unexperienced data. This ability is considered a necessary passing point for achieving human-level intelligence. To achieve this ability, previous unsupervised approaches…

Cited by 7SourcePDFScholar
2023

Prompt-Augmented Linear Probing: Scaling beyond the Limit of Few-Shot In-Context Learners

AAAI 2023technical

Through in-context learning (ICL), large-scale language models are effective few-shot learners without additional model fine-tuning. However, the ICL performance does not scale well with the number of available training sample as it is limited by the inherent input length constraint of the underlyi…

2023

Universal Domain Adaptation for Robust Handling of Distributional Shifts in NLP

EMNLP 2023long findings

When deploying machine learning systems to the wild, it is highly desirable for them to effectively leverage prior knowledge to the unfamiliar domain while also firing alarms to anomalous inputs. In order to address these requirements, Universal Domain Adaptation (UniDA) has emerged as a novel resea…

Cited by 0SourcecodeScholar
2022

Enhancing Out-of-Distribution Detection in Natural Language Understanding via Implicit Layer Ensemble

EMNLP 2022finding

Out-of-distribution (OOD) detection aims to discern outliers from the intended data distribution, which is crucial to maintaining high reliability and a good user experience.Most recent studies in OOD detection utilize the information from a single representation that resides in the penultimate laye…

2022

Ground-Truth Labels Matter: A Deeper Look into Input-Label Demonstrations

EMNLP 2022main

Despite recent explosion of interests in in-context learning, the underlying mechanism and the precise impact of the quality of demonstrations remain elusive.Intuitively, ground-truth labels should have as much impact in in-context learning (ICL) as supervised learning, but recent work reported that…