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Hejun Wu

6 accepted papers

2026

D²PPO: Diffusion Policy Policy Optimization with Dispersive Loss

AAAI 2026technical

Diffusion policies excel at robotic manipulation by naturally modeling multimodal action distributions in high-dimensional spaces. Nevertheless, diffusion policies suffer from diffusion representation collapse: semantically similar observations are mapped to indistinguishable features, ultimately im

Cited by 0SourcePDFScholar
2025

Thinking Before You Speak: A Proactive Test-time Scaling Approach

EMNLP 2025

Large Language Models (LLMs) often exhibit deficiencies with complex reasoning tasks, such as maths, which we attribute to the discrepancy between human reasoning patterns and those presented in the LLMs’ training data. When dealing with complex problems, humans tend to think carefully before expres

Cited by 0SourcePDFScholar
2025

VisRec: A Semi-Supervised Approach to Visibility Data Reconstruction in Radio Astronomy

AAAI 2025technical

Radio telescopes produce visibility data about celestial objects, but these data are sparse and noisy. As a result, images created on raw visibility data are of low quality. Recent studies have used deep learning models to reconstruct visibility data to get cleaner images. However, these methods rel…

2022

De-snowing LiDAR Point Clouds With Intensity and Spatial-Temporal Features

ICRA 2022poster

Point clouds from 3D light detection and ranging (LiDAR) are widely used. Noise caused by falling snow reduces the availability of point clouds. Due to the sparseness of LiDAR point clouds and the fact that the snow point clouds are easily affected by multi factors such as wind or snowfall condition…

Cited by 14SourceScholar