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Hexiang Hu

32 accepted papers

2025

LOFT: Scalable and More Realistic Long-Context Evaluation

NAACL 2025findings

Long-context language models (LCLMs) have the potential to revolutionize our approach to tasks traditionally reliant on external tools like retrieval systems or databases. Leveraging LCLMs’ ability to natively ingest and process entire corpora of information offers numerous advantages. It enhances u…

2025

MEGA-Bench: Scaling Multimodal Evaluation to over 500 Real-World Tasks

ICLR 2025poster

We present MEGA-Bench, an evaluation suite that scales multimodal evaluation to over 500 real-world tasks, to address the highly heterogeneous daily use cases of end users. Our objective is to optimize for a set of high-quality data samples that cover a highly diverse and rich set of multimodal task…

2025

OmnixR: Evaluating Omni-modality Language Models on Reasoning across Modalities

ICLR 2025poster

We introduce \textbf{OmnixR}, an evaluation suite designed to benchmark state-of-the-art Omni-modality Language Models (OLMs), such as GPT-4o and Gemini. Evaluating OLMs, which integrate multiple modalities such as text, vision, and audio, presents unique challenges. Particularly, the user message…

Cited by 5SourcePDFScholar
2025

Scaling Inference Time Compute for Diffusion Models

CVPR 2025highlight

Generative models have made significant impacts across various domains, largely due to their ability to scale during training by increasing data, computational resources, and model size, a phenomenon characterized by the scaling laws. Recent research has begun to explore inference-time scaling behav…

Cited by 0SourcePDFScholar
2024

Instruct-Imagen: Image Generation with Multi-modal Instruction

CVPR 2024poster

This paper presents Instruct-Imagen a model that tackles heterogeneous image generation tasks and generalizes across unseen tasks. We introduce multi-modal instruction for image generation a task representation articulating a range of generation intents with precision. It uses natural language to am…

Cited by 42SourcePDFScholar
2024

MagicLens: Self-Supervised Image Retrieval with Open-Ended Instructions

ICML 2024oral

Image retrieval, i.e., finding desired images given a reference image, inherently encompasses rich, multi-faceted search intents that are difficult to capture solely using image-based measures. Recent works leverage text instructions to allow users to more freely express their search intents. Howeve…

2024

On Scaling Up a Multilingual Vision and Language Model

CVPR 2024poster

We explore the boundaries of scaling up a multilingual vision and language model both in terms of size of the components and the breadth of its training task mixture. Our model achieves new levels of performance on a wide-range of varied and complex tasks including multiple image-based captioning an…

Cited by 8SourcePDFScholar
2024

UniIR: Training and Benchmarking Universal Multimodal Information Retrievers

ECCV 2024oral

"Existing information retrieval (IR) models often assume a homogeneous format, limiting their applicability to diverse user needs, such as searching for images with text descriptions, searching for a news article with a headline image, or finding a similar photo with a query image. To approach such…

Cited by 59SourcePDFScholar
2023

Can Pre-trained Vision and Language Models Answer Visual Information-Seeking Questions?

EMNLP 2023long main

Pre-trained vision and language models have demonstrated state-of-the-art capabilities over existing tasks involving images and texts, including visual question answering. However, it remains unclear whether these models possess the capability to answer questions that are not only querying visual co…

Cited by 0SourcecodeScholar
2023

From Pixels to UI Actions: Learning to Follow Instructions via Graphical User Interfaces

NeurIPS 2023spotlight

Much of the previous work towards digital agents for graphical user interfaces (GUIs) has relied on text-based representations (derived from HTML or other structured data sources), which are not always readily available. These input representations have been often coupled with custom, task-specific…

2023

Open-domain Visual Entity Recognition: Towards Recognizing Millions of Wikipedia Entities

ICCV 2023oral

Large-scale multi-modal pre-training models such as CLIP and PaLI exhibit strong generalization on various visual domains and tasks. However, existing image classification benchmarks often evaluate recognition on a specific domain (e.g., outdoor images) or a specific task (e.g., classifying plant sp…

Cited by 65PDFcodeScholar
2023

Pix2Struct: Screenshot Parsing as Pretraining for Visual Language Understanding

ICML 2023oral

Visually-situated language is ubiquitous---sources range from textbooks with diagrams to web pages with images and tables, to mobile apps with buttons and forms. Perhaps due to this diversity, previous work has typically relied on domain-specific recipes with limited sharing of the underlying data,…

2023

PreSTU: Pre-Training for Scene-Text Understanding

ICCV 2023poster

The ability to recognize and reason about text embedded in visual inputs is often lacking in vision-and-language (V&L) models, perhaps because V&L pre-training methods have often failed to include such an ability in their training objective. In this paper, we propose PreSTU, a novel pre-training rec…

Cited by 27PDFScholar
2023

Re-Imagen: Retrieval-Augmented Text-to-Image Generator

ICLR 2023poster

Research on text-to-image generation has witnessed significant progress in generating diverse and photo-realistic images, driven by diffusion and auto-regressive models trained on large-scale image-text data. Though state-of-the-art models can generate high-quality images of common entities, they of…

Cited by 198SourcePDFScholar
2023

Subject-driven Text-to-Image Generation via Apprenticeship Learning

NeurIPS 2023poster

Recent text-to-image generation models like DreamBooth have made remarkable progress in generating highly customized images of a target subject, by fine-tuning an ``expert model'' for a given subject from a few examples. However, this process is expensive, since a new expert model must be learned fo…

Cited by 193SourcePDFScholar
2022

MuRAG: Multimodal Retrieval-Augmented Generator for Open Question Answering over Images and Text

EMNLP 2022main

While language Models store a massive amount of world knowledge implicitly in their parameters, even very large models often fail to encode information about rare entities and events, while incurring huge computational costs. Recently, retrieval-augmented models, such as REALM, RAG, and RETRO, have…

Cited by 148SourcePDFScholar
2021

Learning the Best Pooling Strategy for Visual Semantic Embedding

CVPR 2021poster

Visual Semantic Embedding (VSE) is a dominant approach for vision-language retrieval, which aims at learning a deep embedding space such that visual data are embedded close to their semantic text labels or descriptions. Recent VSE models use complex methods to better contextualize and aggregate mult…

Cited by 296PDFcodeScholar
2021

MosaicOS: A Simple and Effective Use of Object-Centric Images for Long-Tailed Object Detection

ICCV 2021poster

Many objects do not appear frequently enough in complex scenes (e.g., certain handbags in living rooms) for training an accurate object detector, but are often found frequently by themselves (e.g., in product images). Yet, these object-centric images are not effectively leveraged for improving objec…

Cited by 50PDFcodeScholar
2021

On Model Calibration for Long-Tailed Object Detection and Instance Segmentation

NeurIPS 2021poster

Vanilla models for object detection and instance segmentation suffer from the heavy bias toward detecting frequent objects in the long-tailed setting. Existing methods address this issue mostly during training, e.g., by re-sampling or re-weighting. In this paper, we investigate a largely overlooked…

2021

Systematic Generalization on gSCAN: What is Nearly Solved and What is Next?

EMNLP 2021main

We analyze the grounded SCAN (gSCAN) benchmark, which was recently proposed to study systematic generalization for grounded language understanding. First, we study which aspects of the original benchmark can be solved by commonly used methods in multi-modal research. We find that a general-purpose T…

2020

Few-Shot Learning via Embedding Adaptation With Set-to-Set Functions

CVPR 2020poster

Learning with limited data is a key challenge for visual recognition. Many few-shot learning methods address this challenge by learning an instance embedding function from seen classes and apply the function to instances from unseen classes with limited labels. This style of transfer learning is tas…

Cited by 940PDFcodeScholar
2019

Multimodal Model-Agnostic Meta-Learning via Task-Aware Modulation

NeurIPS 2019spotlight

Model-agnostic meta-learners aim to acquire meta-learned parameters from similar tasks to adapt to novel tasks from the same distribution with few gradient updates. With the flexibility in the choice of models, those frameworks demonstrate appealing performance on a variety of domains such as few-sh…

2018

Compressed Video Action Recognition

CVPR 2018poster

Training robust deep video representations has proven to be much more challenging than learning deep image representations. This is in part due to the enormous size of raw video streams and the high temporal redundancy; the true and interesting signal is often drowned in too much irrelevant data. Mo…

Cited by 428SourcePDFScholar
2018

Synthesized Policies for Transfer and Adaptation across Tasks and Environments

NeurIPS 2018spotlight

The ability to transfer in reinforcement learning is key towards building an agent of general artificial intelligence. In this paper, we consider the problem of learning to simultaneously transfer across both environments and tasks, probably more importantly, by learning from only sparse (environmen…

2017

FastMask: Segment Multi-Scale Object Candidates in One Shot

CVPR 2017spotlight

Objects appear to scale differently in natural images. This fact requires methods dealing with object-centric tasks (e.g. object proposal) to have robust performance over variances in object scales. In the paper, we present a novel segment proposal framework, namely FastMask, which takes advantage o…

Cited by 40PDFcodeScholar
2016

Learning Structured Inference Neural Networks With Label Relations

CVPR 2016poster

Images of scenes have various objects as well as abundant attributes, and diverse levels of visual categorization are possible. A natural image could be assigned with fine-grained labels that describe major components, coarse-grained labels that depict high level abstraction or a set of labels that…

Cited by 162PDFScholar
2016

Structure Inference Machines: Recurrent Neural Networks for Analyzing Relations in Group Activity Recognition

CVPR 2016poster

Rich semantic relations are important in a variety of visual recognition problems. As a concrete example, group activity recognition involves the interactions and relative spatial relations of a set of people in a scene. State of the art recognition methods center on deep learning approaches for tr…

Cited by 308PDFScholar