← Search

Zichen Liu

32 accepted papers

2026

Hybrid-Driven Disc-Shaped Autonomous Underwater Vehicle With High Maneuverability and Gliding Capability: Design and Experiments

RA-L 2026

This paper presents the mechatronic design and implementation of a hybrid-driven disc-shaped autonomous underwater vehicle (HD-AUV). The hybrid-driven system integrates a buoyancy adjustment system and propeller thrusters, enabling the HD-AUV to achieve both high maneuverability motion and energy-ef

Cited by 1SourceScholar
2026

MagicQuill V2: Precise and Interactive Image Editing with Layered Visual Cues

CVPR 2026

We propose MagicQuill V2, a novel framework that introduces a layered composition paradigm to generative image editing, bridging the gap between the semantic power of modern diffusion models and the granular control of traditional graphics software. While state-of-the-art diffusion transformers exce

Cited by 0SourcecodeScholar
2026

Reinforcing General Reasoning Without Verifiers

ICLR 2026poster

The recent paradigm shift towards training large language models (LLMs) using DeepSeek-R1-Zero-style reinforcement learning (RL) on verifiable rewards has led to impressive advancements in code and mathematical reasoning. However, this methodology is limited to tasks where rule-based answer verifica…

Cited by 0SourcecodeScholar
2026

Rethinking the Trust Region in LLM Reinforcement Learning

ICML 2026poster

Reinforcement learning (RL) has become a cornerstone for fine-tuning Large Language Models (LLMs), with Proximal Policy Optimization (PPO) serving as the de facto standard algorithm. Despite its ubiquity, we argue that the core ratio clipping mechanism in PPO is structurally ill-suited for the large…

Cited by 0SourceScholar
2026

SPIRAL: Self-Play on Zero-Sum Games Incentivizes Reasoning via Multi-Agent Multi-Turn Reinforcement Learning

ICLR 2026poster

Recent advances in reinforcement learning have shown that language models can develop sophisticated reasoning through training on tasks with verifiable rewards, but these approaches depend on human-curated problem-answer pairs and domain-specific reward engineering. We introduce SPIRAL, a self-play…

Cited by 0SourcecodeScholar
2026

Scaling Instruction-Based Video Editing with a High-Quality Synthetic Dataset

CVPR 2026

Instruction-based video editing promises to democratize content creation, yet its progress is severely hampered by the scarcity of large-scale, high-quality training data. We introduce Ditto, a holistic framework designed to tackle this fundamental challenge. At its heart, Ditto features a novel dat

Cited by 0SourcecodeScholar
2026

Variational Reasoning for Language Models

ICLR 2026poster

We introduce a **variational reasoning** framework for language models that treats thinking traces as latent variables and optimizes them through variational inference. Starting from the evidence lower bound (ELBO), we extend it to a multi-trace objective for tighter bounds and propose a forward-KL…

Cited by 0SourcecodeScholar
2025

Bootstrapping Language Models with DPO Implicit Rewards

ICLR 2025poster

Human alignment in large language models (LLMs) is an active area of research. A recent groundbreaking work, direct preference optimization (DPO), has greatly simplified the process from past work in reinforcement learning from human feedback (RLHF) by bypassing the reward learning stage in RLHF. DP…

2025

Class-aware Domain Knowledge Fusion and Fission for Continual Test-Time Adaptation

NeurIPS 2025poster

Continual Test-Time Adaptation (CTTA) aims to quickly fine-tune the model during the test phase so that it can adapt to multiple unknown downstream domain distributions without pre-acquiring downstream domain data. To this end, existing advanced CTTA methods mainly reduce the catastrophic forgettin…

Cited by 0SourcecodeScholar
2025

Continual Reinforcement Learning by Planning with Online World Models

ICML 2025spotlight

Continual reinforcement learning (CRL) refers to a naturalistic setting where an agent needs to endlessly evolve, by trial and error, to solve multiple tasks that are presented sequentially. One of the largest obstacles to CRL is that the agent may forget how to solve previous tasks when learning a…

Cited by 0SourcePDFScholar
2025

Dynamic Typography: Bringing Text to Life via Video Diffusion Prior

ICCV 2025poster

Text animation serves as an expressive medium, transforming static communication into dynamic experiences by infusing words with motion to evoke emotions, emphasize meanings, and construct compelling narratives. Crafting animations that are semantically aware poses significant challenges, demanding…

Cited by 0SourcePDFScholar
2025

GAPrompt: Geometry-Aware Point Cloud Prompt for 3D Vision Model

ICML 2025poster

Pre-trained 3D vision models have gained significant attention for their promising performance on point cloud data. However, fully fine-tuning these models for downstream tasks is computationally expensive and storage-intensive. Existing parameter-efficient fine-tuning (PEFT) approaches, which focus…

2025

Hallucination at a Glance: Controlled Visual Edits and Fine-Grained Multimodal Learning

NeurIPS 2025poster

Multimodal large language models (MLLMs) have achieved strong performance on vision-language tasks but still struggle with fine-grained visual differences, leading to hallucinations or missed semantic shifts. We attribute this to limitations in both training data and learning objectives. To address…

Cited by 0SourcecodeScholar
2025

Improving the Euclidean Diffusion Generation of Manifold Data by Mitigating Score Function Singularity

NeurIPS 2025poster

Euclidean diffusion models have achieved remarkable success in generative modeling across diverse domains, and they have been extended to manifold cases in recent advances. Instead of explicitly utilizing the structure of special manifolds as studied in previous works, in this paper we investigate d…

Cited by 0SourceScholar
2025

MagicQuill: An Intelligent Interactive Image Editing System

CVPR 2025poster

As a highly practical application, image editing encounters a variety of user demands and thus prioritizes excellent ease of use. In this paper, we unveil MagicQuill, an integrated image editing system designed to support users in swiftly actualizing their creativity. Our system starts with a stream…

2025

Optimizing Anytime Reasoning via Budget Relative Policy Optimization

NeurIPS 2025poster

Scaling test-time compute is crucial for enhancing the reasoning capabilities of large language models (LLMs). Existing approaches typically employ reinforcement learning (RL) to maximize a verifiable reward obtained at the end of reasoning traces. However, such methods optimize only the final perfo…

Cited by 0SourcecodeScholar
2025

Reinforcement Learning-Based Autonomous Control Methodology of Hydraulic Excavators

IROS 2025

The automation of hydraulic excavators is significant for enhancing productivity and safety in uncertain and dynamic environments. Achieving autonomous operation requires advanced control strategies capable of handling system constraints, nonlinear hydraulic dynamics, and complex environmental inter

Cited by 0SourceScholar
2025

SCAP: Transductive Test-Time Adaptation via Supportive Clique-based Attribute Prompting

CVPR 2025poster

Vision-language models (VLMs) encounter considerable challenges when adapting to domain shifts stemming from changes in data distribution. Test-time adaptation (TTA) has emerged as a promising approach to enhance VLM performance under such conditions. In practice, test data often arrives in batches,…

2025

STOP: Integrated Spatial-Temporal Dynamic Prompting for Video Understanding

CVPR 2025poster

Pre-trained on tremendous image-text pairs, vision-language models like CLIP have demonstrated promising zero-shot generalization across numerous image-based tasks. However, extending these capabilities to video tasks remains challenging due to limited labeled video data and high training costs. Rec…

2025

Selective Visual Prompting in Vision Mamba

AAAI 2025technical

Pre-trained Vision Mamba~(Vim) models have demonstrated exceptional performance across various computer vision tasks in a computationally efficient manner, attributed to their unique design of selective state space models. To further extend their applicability to diverse downstream vision tasks, Vim…

2025

State Space Prompting via Gathering and Spreading Spatio-Temporal Information for Video Understanding

NeurIPS 2025poster

Recently, pre-trained state space models have shown great potential for video classification, which sequentially compresses visual tokens in videos with linear complexity, thereby improving the processing efficiency of video data while maintaining high performance. To apply powerful pre-trained mode…

Cited by 0SourceScholar
2025

Token Coordinated Prompt Attention is Needed for Visual Prompting

ICML 2025poster

Visual prompting techniques are widely used to efficiently fine-tune pretrained Vision Transformers (ViT) by learning a small set of shared prompts for all tokens. However, existing methods overlook the unique roles of different tokens in conveying discriminative information and interact with all to…

2024

AnyHome: Open-Vocabulary Large-Scale Indoor Scene Generation with First-Person View Exploration

ECCV 2024poster

"Inspired by cognitive theories, we introduce , a framework that translates any text into well-structured and textured indoor scenes at a house-scale. By prompting Large Language Models (LLMs) with designed templates, our approach converts provided textual narratives into amodal structured represent…

Cited by 0SourcePDFScholar
2024

DART: Dual-Modal Adaptive Online Prompting and Knowledge Retention for Test-Time Adaptation

AAAI 2024technical

As an up-and-coming area, CLIP-based pre-trained vision-language models can readily facilitate downstream tasks through the zero-shot or few-shot fine-tuning manners. However, they still face critical challenges in test-time generalization due to the shifts between the training and test data distrib…

Cited by 10SourcePDFScholar
2023

Efficient Offline Policy Optimization with a Learned Model

ICLR 2023poster

MuZero Unplugged presents a promising approach for offline policy learning from logged data. It conducts Monte-Carlo Tree Search (MCTS) with a learned model and leverages Reanalyze algorithm to learn purely from offline data. For good performance, MCTS requires accurate learned models and a large nu…

2022

EnvPool: A Highly Parallel Reinforcement Learning Environment Execution Engine

NeurIPS 2022accept

There has been significant progress in developing reinforcement learning (RL) training systems. Past works such as IMPALA, Apex, Seed RL, Sample Factory, and others, aim to improve the system's overall throughput. In this paper, we aim to address a common bottleneck in the RL training system, i.e.,…

2022

TaxoPrompt: A Prompt-based Generation Method with Taxonomic Context for Self-Supervised Taxonomy Expansion

IJCAI 2022poster

Taxonomies are hierarchical classifications widely exploited to facilitate downstream natural language processing tasks. The taxonomy expansion task aims to incorporate emergent concepts into the existing taxonomies. Prior works focus on modeling the local substructure of taxonomies but neglect the…

Cited by 24SourcePDFScholar
2022

TreeMAN: Tree-enhanced Multimodal Attention Network for ICD Coding

COLING 2022main

ICD coding is designed to assign the disease codes to electronic health records (EHRs) upon discharge, which is crucial for billing and clinical statistics. In an attempt to improve the effectiveness and efficiency of manual coding, many methods have been proposed to automatically predict ICD codes…

2021

TEMP: Taxonomy Expansion with Dynamic Margin Loss through Taxonomy-Paths

EMNLP 2021main

As an essential form of knowledge representation, taxonomies are widely used in various downstream natural language processing tasks. However, with the continuously rising of new concepts, many existing taxonomies are unable to maintain coverage by manual expansion. In this paper, we propose TEMP, a…