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Xuhui Liu

11 accepted papers

2026

Automated Random Embedding for Practical Bayesian Optimization with Unknown Effective Dimension

IJCAI 2026

Bayesian optimization is widely employed for optimizing complex black-box functions but struggles with the curse of dimensionality. Random embedding, as a dimension reduction strategy, simplifies tasks that possess the effective dimension by optimizing within a low-dimensional subspace. However, det

Cited by 0Scholar
2026

Light of Normals: Unified Feature Representation for Universal Photometric Stereo

ICLR 2026poster

Universal photometric stereo (PS) is defined by two factors: it must (i) operate under arbitrary, unknown lighting conditions and (ii) avoid reliance on specific illumination models. Despite progress (e.g., SDM UniPS), two challenges remain. First, current encoders cannot guarantee that illumination…

Cited by 0SourcecodeScholar
2026

SURGE: Surrogate Gradient Adaptation in Binary Neural Networks

ICML 2026poster

The training of Binary Neural Networks (BNNs) is fundamentally based on gradient approximation for non-differentiable binarization operations (e.g., sign function). However, prevailing methods including the Straight-Through Estimator (STE) and its improved variants, rely on hand-crafted designs that…

Cited by 0SourceScholar
2026

Unbiased Dynamic Pruning for Efficient Group-Based Policy Optimization

ICML 2026poster

Group Relative Policy Optimization (GRPO) effectively scales LLM reasoning but incurs prohibitive computational costs due to its extensive group-based sampling requirement. While recent selective data utilization methods can mitigate this overhead, they could induce estimation bias by altering the u…

Cited by 0SourceScholar
2024

Controllable Mind Visual Diffusion Model

AAAI 2024technical

Brain signal visualization has emerged as an active research area, serving as a critical interface between the human visual system and computer vision models. Diffusion-based methods have recently shown promise in analyzing functional magnetic resonance imaging (fMRI) data, including the reconstruct…

2024

DiffuX2CT: Diffusion Learning to Reconstruct CT Images from Biplanar X-Rays

ECCV 2024poster

"Computed tomography (CT) is widely utilized in clinical settings because it delivers detailed 3D images of the human body. However, performing CT scans is not always feasible due to radiation exposure and limitations in certain surgical environments. As an alternative, reconstructing CT images from…

Cited by 3SourcePDFScholar
2024

UV-IDM: Identity-Conditioned Latent Diffusion Model for Face UV-Texture Generation

CVPR 2024poster

3D face reconstruction aims at generating high-fidelity 3D face shapes and textures from single-view or multi-view images. However current prevailing facial texture generation methods generally suffer from low-quality texture identity information loss and inadequate handling of occlusions. To solve…

2023

Implicit Diffusion Models for Continuous Super-Resolution

CVPR 2023poster

Image super-resolution (SR) has attracted increasing attention due to its wide applications. However, current SR methods generally suffer from over-smoothing and artifacts, and most work only with fixed magnifications. This paper introduces an Implicit Diffusion Model (IDM) for high-fidelity continu…

2022

FNeVR: Neural Volume Rendering for Face Animation

NeurIPS 2022accept

Face animation, one of the hottest topics in computer vision, has achieved a promising performance with the help of generative models. However, it remains a critical challenge to generate identity preserving and photo-realistic images due to the sophisticated motion deformation and complex facial de…

2020

NAS-Count: Counting-by-Density with Neural Architecture Search

ECCV 2020poster

Most of the recent advances in crowd counting have evolved from hand-designed density estimation networks, where multi-scale features are leveraged to address the scale variation problem, but at the expense of demanding design efforts. In this work, we automate the design of counting models with Neu…

Cited by 121SourcePDFScholar