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Ran Xu

62 accepted papers

2026

Alternating Reinforcement Learning for Rubric-Based Reward Modeling in Non-Verifiable LLM Post-Training

ICML 2026poster

Standard reward models typically predict scalar scores that fail to capture the multifaceted nature of response quality in non-verifiable domains, such as creative writing or open-ended instruction following. To address this limitation, we propose Rubric-ARM, a framework that jointly optimizes a rub…

Cited by 0SourceScholar
2026

CoAct-1: Computer-using Multi-agent System with Coding Actions

ICLR 2026poster

Autonomous agents that operate computers via Graphical User Interfaces (GUIs) often struggle with efficiency and reliability on complex, long-horizon tasks. While augmenting these agents with planners can improve task decomposition, they remain constrained by the inherent limitations of performing a…

Cited by 0SourcecodeScholar
2026

Decomposing the Neurons: Activation Sparsity via Mixture of Experts for Continual Test Time Adaptation

AAAI 2026technical

Continual Test-Time Adaptation (CTTA), which aims to adapt the pre-trained model to ever-evolving target domains, emerges as an important task for vision models. As current vision models appear to be heavily biased towards texture, continuously adapting the model from one domain distribution to anot

Cited by 0SourcePDFScholar
2026

GP3: A 3D Geometry-Aware Policy with Multi-View Images for Robotic Manipulation

ICRA 2026poster

Effective robotic manipulation relies on a precise understanding of 3D scene geometry, and one of the most straightforward ways to acquire such geometry is through multi-view observations. Motivated by this, we present GP3—a 3D geometry-aware robotic manipulation policy that leverages multi-view inp…

2026

Incentivizing Agentic Reasoning in LLM Judges via Tool-Integrated Reinforcement Learning

ICLR 2026poster

Large Language Models (LLMs) are widely used as judges to evaluate response quality, providing a scalable alternative to human evaluation. However, most LLM judges operate solely on intrinsic text-based reasoning, limiting their ability to verify complex constraints or perform accurate computation.…

Cited by 0SourceScholar
2026

MedAgentGym: A Scalable Agentic Training Environment for Code-Centric Reasoning in Biomedical Data Science

ICLR 2026oral

We introduce MedAgentGym, a scalable and interactive training environment designed to enhance coding-based biomedical reasoning capabilities in large language model (LLM) agents. MedAgentGym comprises 72,413 task instances across 129 categories derived from 12 authentic real-world biomedical scenari…

Cited by 0SourcecodeScholar
2026

NaturalVLM: Leveraging Fine-Grained Natural Language for Affordance-Guided Visual Manipulation

ICRA 2026poster

Enabling home-assistant robots to perceive and manipulate a diverse range of 3D objects based on human language instructions is a pivotal challenge. Prior research has predominantly focused on simplistic and task-oriented instructions, i.e., "Slide the top drawer open". However, many real-world task…

2026

On the Generalization Capacities of MLLMs for Spatial Intelligence

ICLR 2026oral

Multimodal Large Language Models (MLLMs) that directly process RGB inputs for tasks like 3D localization and navigation have shown remarkable potential. However, we argue that these ``RGB-only'' approaches are fundamentally flawed in their ability to generalize across cameras. By ignoring camera par…

Cited by 0SourcecodeScholar
2026

SCUBA: Salesforce Computer Use Benchmark

ICLR 2026poster

We introduce SCUBA, a benchmark designed to evaluate computer-use agents on customer relationship management (CRM) workflows within the Salesforce platform. SCUBA contains 300 task instances derived from real user interviews, spanning three primary personas—platform administrators, sales representat…

Cited by 0SourcecodeScholar
2026

Scaling Agentic Reinforcement Learning for Tool-Integrated Reasoning in VLMs

CVPR 2026

While recent vision-language models (VLMs) demonstrate strong image understanding, their ability to "think with images," i.e., to reason through multi-step visual interactions, remains limited. We introduce VISTA-Gym, a scalable training environment for incentivizing tool-integrated visual reasoning

Cited by 0SourcecodeScholar
2026

WALT: Web Agents that Learn Tools

ICLR 2026poster

Web agents promise to automate complex browser tasks, but current methods remain brittle -- relying on step-by-step UI interactions and heavy LLM reasoning that break under dynamic layouts and long horizons. Humans, by contrast, exploit website-provided functionality through high-level operations li…

Cited by 0SourcecodeScholar
2025

A Mole-inspired Incisor-Burrowing Robotic Platform for Planetary Exploration

IROS 2025

Planetary exploration requires efficient methods for subsurface sampling, especially in extreme energy limitations. Traditional drilling methods are often energy intensive and require large platforms, limiting their applicability. Bio-inspired burrowing techniques, inspired by animals like moles, of

Cited by 0SourceScholar
2025

AceSearcher: Bootstrapping Reasoning and Search for LLMs via Reinforced Self-Play

NeurIPS 2025spotlight

Search-augmented LLMs often struggle with complex reasoning tasks due to ineffective multi-hop retrieval and limited reasoning ability. We propose AceSearcher, a cooperative self-play framework that trains a single large language model (LLM) to alternate between two roles: a decomposer that breaks d…

Cited by 0SourceScholar
2025

Contra4: Evaluating Contrastive Cross-Modal Reasoning in Audio, Video, Image, and 3D

EMNLP 2025

Real-world decision-making often begins with identifying which modality contains the most relevant information for a given query. While recent multimodal models have made impressive progress in processing diverse inputs, it remains unclear whether they can reason contrastively across multiple modali

Cited by 0SourcePDFScholar
2025

DyMU: Dynamic Merging and Virtual Unmerging for Efficient Variable-Length VLMs

NeurIPS 2025poster

We present DyMU, an efficient, training-free framework that dynamically reduces the computational burden of vision-language models (VLMs) while maintaining high task performance. Our approach comprises two key components. First, Dynamic Token Merging (DToMe) reduces the number of visual token embedd…

Cited by 0SourceScholar
2025

Retrieval-augmented GUI Agents with Generative Guidelines

EMNLP 2025

GUI agents powered by vision-language models (VLMs) show promise in automating complex digital tasks. However, their effectiveness in real-world applications is often limited by scarce training data and the inherent complexity of these tasks, which frequently require long-tailed knowledge covering r

Cited by 0SourcePDFScholar
2025

RoseRAG: Robust Retrieval-augmented Generation with Small-scale LLMs via Margin-aware Preference Optimization

ACL 2025finding

Large language models (LLMs) have achieved impressive performance but face high computational costs and latency, limiting their deployment in resource-constrained settings. In contrast, small-scale LLMs (SLMs) are more efficient yet struggle to capture evolving real-world knowledge. Retrieval-augmen…

2025

SimRAG: Self-Improving Retrieval-Augmented Generation for Adapting Large Language Models to Specialized Domains

NAACL 2025long

Retrieval-augmented generation (RAG) enhances the question answering (QA) abilities of large language models (LLMs) by integrating external knowledge. However, adapting general-purpose RAG systems to specialized fields such as science and medicine poses unique challenges due to distribution shifts a…

Cited by 2SourcePDFScholar
2025

Structured Policy Optimization: Enhance Large Vision-Language Model via Self-referenced Dialogue

ICCV 2025poster

Preference optimization algorithms typically enhance LLM response quality by leveraging human feedback on multiple answers given a fixed instruction. However, these methods often lack capturing the dynamic nature of conversational exchanges. For large vision-language models (LVLMs), direct preferenc…

Cited by 0SourcePDFScholar
2025

Text2Data: Low-Resource Data Generation with Textual Control

AAAI 2025technical

Natural language serves as a common and straightforward control signal for humans to interact seamlessly with machines. Recognizing the importance of this interface, the machine learning community is investing considerable effort in generating data that is semantically coherent with textual instruct…

2025

Towards Scalable Spatial Intelligence via 2D-to-3D Data Lifting

ICCV 2025poster

Spatial intelligence is emerging as a transformative frontier in AI, yet it remains constrained by the scarcity of large-scale 3D datasets. Unlike the abundant 2D imagery, acquiring 3D data typically requires specialized sensors and laborious annotation. In this work, we present a scalable pipeline…

2025

Trust but Verify: Programmatic VLM Evaluation in the Wild

ICCV 2025poster

Vision-Language Models (VLMs) frequently hallucinate responses to visual queries, undermining their reliability for critical applications. However, quantifying the effect of such hallucinations in free-form responses to open-ended queries requires visually verifying each claim within the response, w…

Cited by 0SourcePDFScholar
2025

xLAM: A Family of Large Action Models to Empower AI Agent Systems

NAACL 2025long

Autonomous agents powered by large language models (LLMs) have attracted significant research interest. However, the open-source community faces many challenges in developing specialized models for agent tasks, driven by the scarcity of high-quality agent datasets and the absence of standard protoco…

2024

"X-InstructBLIP: A Framework for Aligning Image, 3D, Audio, Video to LLMs and its Emergent Cross-modal Reasoning"

ECCV 2024poster

"Recent research has achieved significant advancements in visual reasoning tasks through learning image-to-language projections and leveraging the impressive reasoning abilities of Large Language Models (LLMs). This paper introduces an efficient and effective framework that integrates multiple modal…

2024

BMRetriever: Tuning Large Language Models as Better Biomedical Text Retrievers

EMNLP 2024main

Developing effective biomedical retrieval models is important for excelling at knowledge-intensive biomedical tasks but still challenging due to the lack of sufficient publicly annotated biomedical data and computational resources. We present BMRetriever, a series of dense retrievers for enhancing b…

2024

Continual-MAE: Adaptive Distribution Masked Autoencoders for Continual Test-Time Adaptation

CVPR 2024poster

Continual Test-Time Adaptation (CTTA) is proposed to migrate a source pre-trained model to continually changing target distributions addressing real-world dynamism. Existing CTTA methods mainly rely on entropy minimization or teacher-student pseudo-labeling schemes for knowledge extraction in unlabe…

Cited by 11SourcePDFScholar
2024

Distribution-Aware Continual Test-Time Adaptation for Semantic Segmentation

ICRA 2024poster

Since autonomous driving systems usually face dynamic and ever-changing environments, continual test-time adaptation (CTTA) has been proposed as a strategy for transferring deployed models to continually changing target domains. However, the pursuit of long-term adaptation often introduces catastrop…

Cited by 11SourcecodeScholar
2024

EHRAgent: Code Empowers Large Language Models for Few-shot Complex Tabular Reasoning on Electronic Health Records

EMNLP 2024main

Clinicians often rely on data engineers to retrieve complex patient information from electronic health record (EHR) systems, a process that is both inefficient and time-consuming. We propose EHRAgent, a large language model (LLM) agent empowered with accumulative domain knowledge and robust coding c…

2024

FOFO: A Benchmark to Evaluate LLMs’ Format-Following Capability

ACL 2024long

This paper presents FoFo, a pioneering benchmark for evaluating large language models’ (LLMs) ability to follow complex, domain-specific formats, a crucial yet under-examined capability for their application as AI agents. Despite LLMs’ advancements, existing benchmarks fail to assess their format-fo…

2024

HIVE: Harnessing Human Feedback for Instructional Visual Editing

CVPR 2024poster

Incorporating human feedback has been shown to be crucial to align text generated by large language models to human preferences. We hypothesize that state-of-the-art instructional image editing models where outputs are generated based on an input image and an editing instruction could similarly bene…

2024

Hierarchical Point Attention for Indoor 3D Object Detection

ICRA 2024poster

3D object detection is an essential vision technique for various robotic systems, such as augmented reality and domestic robots. Transformers as versatile network architectures have recently seen great success in 3D point cloud object detection. However, the lack of hierarchy in a plain transformer…

Cited by 1SourceScholar
2024

Knowledge-Infused Prompting: Assessing and Advancing Clinical Text Data Generation with Large Language Models

ACL 2024findings

Clinical natural language processing faces challenges like complex medical terminology and clinical contexts. Recently, large language models (LLMs) have shown promise in this domain. Yet, their direct deployment can lead to privacy issues and are constrained by resources. To address this challenge,…

2024

LayoutDETR: Detection Transformer Is a Good Multimodal Layout Designer

ECCV 2024poster

"Graphic layout designs play an essential role in visual communication. Yet handcrafting layout designs is skill-demanding, time-consuming, and non-scalable to batch production. Generative models emerge to make design automation scalable but it remains non-trivial to produce designs that comply with…

2024

MINT-1T: Scaling Open-Source Multimodal Data by 10x: A Multimodal Dataset with One Trillion Tokens

NeurIPS 2024poster

Multimodal interleaved datasets featuring free-form interleaved sequences of images and text are crucial for training frontier large multimodal models (LMMs). Despite the rapid progression of open-source LMMs, there remains a pronounced scarcity of large-scale, open-source multimodal interleaved dat…

2024

MapGPT: Map-Guided Prompting with Adaptive Path Planning for Vision-and-Language Navigation

ACL 2024long

Embodied agents equipped with GPT as their brain have exhibited extraordinary decision-making and generalization abilities across various tasks. However, existing zero-shot agents for vision-and-language navigation (VLN) only prompt the GPT-4 to select potential locations within localized environmen…

Cited by 30SourcePDFScholar
2024

MedAdapter: Efficient Test-Time Adaptation of Large Language Models Towards Medical Reasoning

EMNLP 2024main

Despite their improved capabilities in generation and reasoning, adapting large language models (LLMs) to the biomedical domain remains challenging due to their immense size and privacy concerns. In this study, we propose MedAdapter, a unified post-hoc adapter for test-time adaptation of LLMs toward…

2024

NaturalVLM: Leveraging Fine-Grained Natural Language for Affordance-Guided Visual Manipulation

RA-L 2024

Enabling home-assistant robots to perceive and manipulate a diverse range of 3D objects based on human language instructions is a pivotal challenge. Prior research has predominantly focused on simplistic and task-oriented instructions, i.e., “Slide the top drawer open”. However, many real-world task

Cited by 18SourceScholar
2024

Position: TrustLLM: Trustworthiness in Large Language Models

ICML 2024poster

Large language models (LLMs) have gained considerable attention for their excellent natural language processing capabilities. Nonetheless, these LLMs present many challenges, particularly in the realm of trustworthiness. This paper introduces TrustLLM, a comprehensive study of trustworthiness in LLM…

Cited by 95SourcePDFScholar
2024

RAM-EHR: Retrieval Augmentation Meets Clinical Predictions on Electronic Health Records

ACL 2024short

We present RAM-EHR, a Retrieval AugMentation pipeline to improve clinical predictions on Electronic Health Records (EHRs). RAM-EHR first collects multiple knowledge sources, converts them into text format, and uses dense retrieval to obtain information related to medical concepts. This strategy addr…

2024

Retroformer: Retrospective Large Language Agents with Policy Gradient Optimization

ICLR 2024spotlight

Recent months have seen the emergence of a powerful new trend in which large language models (LLMs) are augmented to become autonomous language agents capable of performing objective oriented multi-step tasks on their own, rather than merely responding to queries from human users. Most existing lang…

2024

SQ-LLaVA: Self-Questioning for Large Vision-Language Assistant

ECCV 2024poster

"Recent advances in vision-language models have shown notable generalization in broad tasks through visual instruction tuning. However, bridging the gap between the pre-trained vision encoder and the large language models (LLMs) becomes the whole network’s bottleneck. To improve cross-modality align…

2024

ULIP-2: Towards Scalable Multimodal Pre-training for 3D Understanding

CVPR 2024poster

Recent advancements in multimodal pre-training have shown promising efficacy in 3D representation learning by aligning multimodal features across 3D shapes their 2D counterparts and language descriptions. However the methods used by existing frameworks to curate such multimodal data in particular la…

2023

Cold-Start Data Selection for Better Few-shot Language Model Fine-tuning: A Prompt-based Uncertainty Propagation Approach

ACL 2023long

We present PATRON, a prompt-based data selection method for pre-trained language model fine-tuning under cold-start scenarios, i.e., no initial labeled data are available. In PATRON, we design (1) a prompt-based uncertainty propagation approach to estimate the importance of data points and (2) a par…

2023

Deformer: Dynamic Fusion Transformer for Robust Hand Pose Estimation

ICCV 2023poster

Accurately estimating 3D hand pose is crucial for understanding how humans interact with the world. Despite remarkable progress, existing methods often struggle to generate plausible hand poses when the hand is heavily occluded or blurred. In videos, the movements of the hand allow us to observe var…

Cited by 21PDFScholar
2023

GlueGen: Plug and Play Multi-modal Encoders for X-to-image Generation

ICCV 2023poster

Text-to-image (T2I) models based on diffusion processes have achieved remarkable success in controllable image generation using user-provided captions. However, the tight coupling between the current text encoder and image decoder in T2I models makes it challenging to replace or upgrade. Such change…

Cited by 26PDFcodeScholar
2023

Mask-Free OVIS: Open-Vocabulary Instance Segmentation Without Manual Mask Annotations

CVPR 2023poster

Existing instance segmentation models learn task-specific information using manual mask annotations from base (training) categories. These mask annotations require tremendous human effort, limiting the scalability to annotate novel (new) categories. To alleviate this problem, Open-Vocabulary (OV) me…

2023

Neighborhood-Regularized Self-Training for Learning with Few Labels

AAAI 2023technical

Training deep neural networks (DNNs) with limited supervision has been a popular research topic as it can significantly alleviate the annotation burden. Self-training has been successfully applied in semi-supervised learning tasks, but one drawback of self-training is that it is vulnerable to the la…

2023

Open Visual Knowledge Extraction via Relation-Oriented Multimodality Model Prompting

NeurIPS 2023poster

Images contain rich relational knowledge that can help machines understand the world. Existing methods on visual knowledge extraction often rely on the pre-defined format (e.g., sub-verb-obj tuples) or vocabulary (e.g., relation types), restricting the expressiveness of the extracted knowledge. In t…

Cited by 6SourcePDFScholar
2023

Tackling Data Heterogeneity in Federated Learning with Class Prototypes

AAAI 2023technical

Data heterogeneity across clients in federated learning (FL) settings is a widely acknowledged challenge. In response, personalized federated learning (PFL) emerged as a framework to curate local models for clients' tasks. In PFL, a common strategy is to develop local and global models jointly - the…

2023

ULIP: Learning a Unified Representation of Language, Images, and Point Clouds for 3D Understanding

CVPR 2023poster

The recognition capabilities of current state-of-the-art 3D models are limited by datasets with a small number of annotated data and a pre-defined set of categories. In its 2D counterpart, recent advances have shown that similar problems can be significantly alleviated by employing knowledge from ot…

2023

UniControl: A Unified Diffusion Model for Controllable Visual Generation In the Wild

NeurIPS 2023poster

Achieving machine autonomy and human control often represent divergent objectives in the design of interactive AI systems. Visual generative foundation models such as Stable Diffusion show promise in navigating these goals, especially when prompted with arbitrary languages. However, they often fall…

2022

Burn after Reading: Online Adaptation for Cross-Domain Streaming Data

ECCV 2022poster

"In the context of online privacy, many methods propose complex security preserving measures to protect sensitive data. In this paper, we note that: not storing any sensitive data is the best form of security. We propose an online framework called ""Burn After Reading"", i.e. each online sample is p…

Cited by 6SourcePDFScholar
2022

DocQueryNet: Value Retrieval with Arbitrary Queries for Form-like Documents

COLING 2022main

We propose, DocQueryNet, a value retrieval method with arbitrary queries for form-like documents to reduce human effort of processing forms. Unlike previous methods that only address a fixed set of field items, our method predicts target value for an arbitrary query based on the understanding of the…

2022

Open Vocabulary Object Detection with Pseudo Bounding-Box Labels

ECCV 2022poster

"Despite great progress in object detection, most existing methods work only on a limited set of object categories, due to the tremendous human effort needed for bounding-box annotations of training data. To alleviate the problem, recent open vocabulary and zero-shot detection methods attempt to det…

2022

SmartAdapt: Multi-Branch Object Detection Framework for Videos on Mobiles

CVPR 2022poster

Several recent works seek to create lightweight deep networks for video object detection on mobiles. We observe that many existing detectors, previously deemed computationally costly for mobiles, intrinsically support adaptive inference, and offer a multi-branch object detection framework (MBODF). H…

Cited by 15PDFScholar
2022

Use All the Labels: A Hierarchical Multi-Label Contrastive Learning Framework

CVPR 2022poster

Current contrastive learning frameworks focus on leveraging a single supervisory signal to learn representations, which limits the efficacy on unseen data and downstream tasks. In this paper, we present a hierarchical multi-label representation learning framework that can leverage all available labe…

Cited by 102PDFcodeScholar
2022

Visual Emotion Representation Learning via Emotion-Aware Pre-training

IJCAI 2022poster

Despite recent progress in deep learning, visual emotion recognition remains a challenging problem due to ambiguity of emotion perception, diverse concepts related to visual emotion and lack of large-scale annotated dataset. In this paper, we present a large-scale multimodal pre-training method to l…

Cited by 3SourcePDFScholar
2021

WOAD: Weakly Supervised Online Action Detection in Untrimmed Videos

CVPR 2021poster

Online action detection in untrimmed videos aims to identify an action as it happens, which makes it very important for real-time applications. Previous methods rely on tedious annotations of temporal action boundaries for training, which hinders the scalability of online action detection systems. W…

Cited by 68PDFScholar
2017

Development of an optical fiber-based sensor for grasping and axial force sensing

ICRA 2017poster

In spite of the remarkable benefits that minimally invasive surgery provides for patients, the absence of force feedback is still a significant disadvantage. Several studies have been performed to address this issue; however, an accurate sterilizable force sensing technology for measuring axial and…

Cited by 33SourceScholar
2016

Curvature, Torsion, and Force Sensing in Continuum Robots Using Helically Wrapped FBG Sensors

RA-L 2016

Due to their small size and flexibility, fiber Bragg grating (FBG) sensors have been integrated into needle-sized continuum robots for shape estimation and force measurement. The challenge in extending previous shape and force sensing technologies to pre-curved continuum robots, such as concentric-t

Cited by 224SourceScholar