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Ximeng Sun

16 accepted papers

2026

CaptionQA: Is Your Caption as Useful as the Image Itself?

CVPR 2026

Image captions serve as efficient surrogates for visual content in multimodal systems such as retrieval, recommendation, multi-step agentic inference pipelines. Yet current evaluation practices miss a fundamental question: Can captions stand-in for images in real downstream tasks? We propose a utili

Cited by 0SourcecodeScholar
2026

ImageDoctor: Diagnosing Text-to-Image Generation via Grounded Image Reasoning

ICLR 2026poster

The rapid advancement of text-to-image (T2I) models has increased the need for reliable human preference modeling, a demand further amplified by recent progress in reinforcement learning for preference alignment. However, existing approaches typically quantify the quality of a generated image using…

Cited by 0SourceScholar
2026

VideoSeek: Long-Horizon Video Agent with Tool-Guided Seeking

CVPR 2026

Video agentic models have advanced challenging video-language tasks. However, most agentic approaches still heavily rely on greedy parsing over densely sampled video frames, resulting in high computational cost. We present VideoSeek, a long-horizon video agent that leverages video logic flow to acti

Cited by 3SourcecodeScholar
2026

XModBench: Benchmarking Cross-Modal Capabilities and Consistency in Omni-Language Models

ICLR 2026poster

Omni-modal large language models (OLLMs) aim to unify audio, vision, and text understanding within a single framework. While existing benchmarks have advanced multimodal evaluation, it remains unclear whether OLLMs achieve modality-invariant reasoning or inherit modality-specific biases. We introduc…

Cited by 0SourceScholar
2025

Agent Laboratory: Using LLM Agents as Research Assistants

EMNLP 2025

Historically, scientific discovery has been a lengthy and costly process, demanding substantial time and resources from initial conception to final results. To accelerate scientific discovery, reduce research costs, and improve research quality, we introduce Agent Laboratory, an autonomous LLM-based

Cited by 0SourcePDFScholar
2025

Self-Taught Agentic Long Context Understanding

ACL 2025long

Answering complex, long-context questions remains a major challenge for large language models (LLMs) as it requires effective question clarifications and context retrieval. We propose Agentic Long-Context Understanding (AgenticLU), a framework designed to enhance an LLM’s understanding of such queri…

2025

SoftVQ-VAE: Efficient 1-Dimensional Continuous Tokenizer

CVPR 2025poster

Efficient image tokenization with high compression ratios remains a critical challenge for training generative models.We present SoftVQ-VAE, a continuous image tokenizer that leverages soft categorical posteriors to aggregate multiple codewords into each latent token, substantially increasing the re…

2025

Unleashing Hour-Scale Video Training for Long Video-Language Understanding

NeurIPS 2025spotlight

Recent long-form video-language understanding benchmarks have driven progress in video large multimodal models (Video-LMMs). However, the scarcity of well-annotated long videos has left the training of hour-long Video-LMMs underexplored. To close this gap, we present VideoMarathon, a large-scale hou…

Cited by 0SourceScholar
2024

Koala: Key Frame-Conditioned Long Video-LLM

CVPR 2024highlight

Long video question answering is a challenging task that involves recognizing short-term activities and reasoning about their fine-grained relationships. State-of-the-art video Large Language Models (vLLMs) hold promise as a viable solution due to their demonstrated emergent capabilities on new task…

Cited by 33SourcePDFScholar
2023

DIME-FM : DIstilling Multimodal and Efficient Foundation Models

ICCV 2023poster

Large Vision-Language Foundation Models (VLFM), such as CLIP, ALIGN and Florence, are trained on large private datasets of image-caption pairs and achieve superior transferability and robustness on downstream tasks, but they are difficult to use in many practical applications due to their large size…

Cited by 21PDFScholar
2022

DualCoOp: Fast Adaptation to Multi-Label Recognition with Limited Annotations

NeurIPS 2022accept

Solving multi-label recognition (MLR) for images in the low-label regime is a challenging task with many real-world applications. Recent work learns an alignment between textual and visual spaces to compensate for insufficient image labels, but loses accuracy because of the limited amount of availab…

Cited by 141SourcePDFScholar
2021

AdaMML: Adaptive Multi-Modal Learning for Efficient Video Recognition

ICCV 2021poster

Multi-modal learning, which focuses on utilizing various modalities to improve the performance of a model, is widely used in video recognition. While traditional multi-modal learning offers excellent recognition results, its computational expense limits its impact for many real-world applications. I…

Cited by 65PDFcodeScholar
2021

Dynamic Network Quantization for Efficient Video Inference

ICCV 2021poster

Deep convolutional networks have recently achieved great success in video recognition, yet their practical realization remains a challenge due to the large amount of computational resources required to achieve robust recognition. Motivated by the effectiveness of quantization for boosting efficiency…

Cited by 56PDFScholar
2020

AdaShare: Learning What To Share For Efficient Deep Multi-Task Learning

NeurIPS 2020poster

Multi-task learning is an open and challenging problem in computer vision. The typical way of conducting multi-task learning with deep neural networks is either through handcrafted schemes that share all initial layers and branch out at an adhoc point, or through separate task-specific networks with…

Cited by 315SourcePDFScholar
2019

Domain Agnostic Learning with Disentangled Representations

ICML 2019oral

Unsupervised model transfer has the potential to greatly improve the generalizability of deep models to novel domains. Yet the current literature assumes that the separation of target data into distinct domains is known a priori. In this paper, we propose the task of Domain-Agnostic Learning (DAL):…