no code implementations • 3 Apr 2024 • Sang Hu, Zihan Zhou
In particular, when in a repeated experiment the naive agent can observe her actual sequence of actions which are inconsistent with what she has planned at the initial time, she then chooses her immediate action based on the observations on her later actual behavior.
1 code implementation • 1 Apr 2024 • Ruowen Zhao, Zhengyi Wang, Yikai Wang, Zihan Zhou, Jun Zhu
However, due to the challenge of directly deforming the mesh representation to approach the target topology, most methodologies learn an implicit representation (such as NeRF) during the sparse-view reconstruction and acquire the target mesh by a post-processing extraction.
no code implementations • 3 Mar 2024 • Zihan Zhou, Ruiying Liu, Jiachen Zheng, Xiaoxue Wang, Tianshu Yu
Sampling viable 3D structures (e. g., molecules and point clouds) with SE(3)-invariance using diffusion-based models proved promising in a variety of real-world applications, wherein SE(3)-invariant properties can be naturally characterized by the inter-point distance manifold.
no code implementations • 23 Feb 2024 • Zihan Zhou, Jonathan Booher, Khashayar Rohanimanesh, Wei Liu, Aleksandr Petiushko, Animesh Garg
Safe reinforcement learning tasks with multiple constraints are a challenging domain despite being very common in the real world.
1 code implementation • 18 Feb 2024 • Zhiyu Yang, Zihan Zhou, Shuo Wang, Xin Cong, Xu Han, Yukun Yan, Zhenghao Liu, Zhixing Tan, Pengyuan Liu, Dong Yu, Zhiyuan Liu, Xiaodong Shi, Maosong Sun
Scientific data visualization plays a crucial role in research by enabling the direct display of complex information and assisting researchers in identifying implicit patterns.
no code implementations • 15 Dec 2023 • Mengze Gao, Xiaozhi Cao, Daniel Abraham, Zihan Zhou, Kawin Setsompop
$B_1^+$ and $B_0$ field-inhomogeneities can significantly reduce accuracy and robustness of MRF's quantitative parameter estimates.
no code implementations • 7 Oct 2023 • Zihan Zhou, Ruiying Liu, Tianshu Yu
Diffusion-based generative models in SE(3)-invariant space have demonstrated promising performance in molecular conformation generation, but typically require solving stochastic differential equations (SDEs) with thousands of update steps.
no code implementations • 27 Sep 2023 • Zihan Zhou, Honghao Wei, Lei Ying
PRI achieves trio objectives: (i) PRI is a model-free algorithm; and (ii) it outputs an approximately optimal policy with a high probability at the end of learning; and (iii) PRI guarantees $\tilde{\mathcal{O}}(H\sqrt{K})$ regret and constraint violation, which significantly improves the best existing regret bound $\tilde{\mathcal{O}}(H^4 \sqrt{SA}K^{\frac{4}{5}})$ under a model-free algorithm, where $H$ is the length of each episode, $S$ is the number of states, $A$ is the number of actions, and the total number of episodes during learning is $2K+\tilde{\cal O}(K^{0. 25}).$ We further present a matching lower via an example that shows under any online learning algorithm, there exists a well-separated CMDP instance such that either the regret or violation has to be $\Omega(H\sqrt{K}),$ which matches the upper bound by a polylogarithmic factor.
no code implementations • 23 Sep 2023 • Rui Yu, Jiachen Liu, Zihan Zhou, Sharon X. Huang
In various applications, such as robotic navigation and remote visual assistance, expanding the field of view (FOV) of the camera proves beneficial for enhancing environmental perception.
no code implementations • 12 Sep 2023 • Zihan Zhou, Ruiying Liu, Chaolong Ying, Ruimao Zhang, Tianshu Yu
Molecular conformation generation, a critical aspect of computational chemistry, involves producing the three-dimensional conformer geometry for a given molecule.
1 code implementation • ICCV 2023 • Wentao Hu, Jia Zheng, Zixin Zhang, Xiaojun Yuan, Jian Yin, Zihan Zhou
In this paper, we develop a new method to automatically convert 2D line drawings from three orthographic views into 3D CAD models.
1 code implementation • 1 Aug 2023 • Yuelin Xin, Zihan Zhou, Yuxuan Xia
We present 2SDS (Scene Separation and Data Selection algorithm), a temporal segmentation algorithm used in real-time video stream interpretation.
1 code implementation • 30 Apr 2023 • Zihan Zhou, Animesh Garg
We propose Structured Exploration with Achievements (SEA), a multi-stage reinforcement learning algorithm designed for achievement-based environments, a particular type of environment with an internal achievement set.
no code implementations • 3 Feb 2023 • Zihan Zhou, Tianshu Yu
In this paper, we propose a sequential learning approach under this setting by decoupling a complex system for handling irregularly sampled and cluttered sequential observations.
no code implementations • 6 Sep 2022 • Jia Zheng, Yifan Zhu, Kehan Wang, Qiang Zou, Zihan Zhou
In this paper, we revisit the long-standing problem of automatic reconstruction of 3D objects from single line drawings.
no code implementations • 27 Jul 2022 • Jiachen Liu, Yuan Xue, Jose Duarte, Krishnendra Shekhawat, Zihan Zhou, Xiaolei Huang
In the first stage, we encode the room connectivity graph input by users with a graph convolutional network (GCN), then apply an autoregressive transformer network to generate an initial floorplan sequence.
no code implementations • ICLR 2022 • Zihan Zhou, Wei Fu, Bingliang Zhang, Yi Wu
We present Reward-Switching Policy Optimization (RSPO), a paradigm to discover diverse strategies in complex RL environments by iteratively finding novel policies that are both locally optimal and sufficiently different from existing ones.
1 code implementation • CVPR 2022 • Kehan Wang, Jia Zheng, Zihan Zhou
In computer-aided design (CAD) systems, 2D line drawings are commonly used to illustrate 3D object designs.
no code implementations • 19 Dec 2021 • Atul Sharma, Pranjal Jain, Ashraf Mahgoub, Zihan Zhou, Kanak Mahadik, Somali Chaterji
We also show that the alignment rate and assembly quality computed for the corrected reads are strongly negatively correlated with the perplexity, enabling the automated selection of k-mer values for better error correction, and hence, improved assembly quality.
1 code implementation • CVPR 2022 • Fengting Yang, Xiaolei Huang, Zihan Zhou
Depth-from-focus (DFF) is a technique that infers depth using the focus change of a camera.
1 code implementation • 21 Aug 2021 • Weizhe Chen, Zihan Zhou, Yi Wu, Fei Fang
One practical requirement in solving dynamic games is to ensure that the players play well from any decision point onward.
no code implementations • 18 Aug 2021 • Rui Yu, Zihan Zhou
Human trajectory prediction has received increased attention lately due to its importance in applications such as autonomous vehicles and indoor robots.
1 code implementation • 30 Jul 2021 • Qinqin Yang, Yanhong Lin, Jiechao Wang, Jianfeng Bao, Xiaoyin Wang, Lingceng Ma, Zihan Zhou, Qizhi Yang, Shuhui Cai, Hongjian He, Congbo Cai, Jiyang Dong, Jingliang Cheng, Zhong Chen, Jianhui Zhong
Use of synthetic data has provided a potential solution for addressing unavailable or insufficient training samples in deep learning-based magnetic resonance imaging (MRI).
no code implementations • 22 Sep 2020 • Rui Yu, Zhenyuan Yuan, Minghui Zhu, Zihan Zhou
Nowadays, the prevalence of sensor networks has enabled tracking of the states of dynamic objects for a wide spectrum of applications from autonomous driving to environmental monitoring and urban planning.
1 code implementation • CVPR 2018 • Kun Huang, Yifan Wang, Zihan Zhou, Tianjiao Ding, Shenghua Gao, Yi Ma
To this end, we have built a very large new dataset of over 5, 000 images with wireframes thoroughly labelled by humans.
no code implementations • 30 Mar 2020 • Zihan Zhou, Jun Yan, Andrea Addazi, Yi-Fu Cai, Antonino Marciano, Roman Pasechnik
We report on a novel phenomenon of particle cosmology, which features specific cosmological phase transitions via quantum tunnelings through multiple vacua.
Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory
1 code implementation • CVPR 2020 • Fengting Yang, Qian Sun, Hailin Jin, Zihan Zhou
In computer vision, superpixels have been widely used as an effective way to reduce the number of image primitives for subsequent processing.
1 code implementation • ICLR 2020 • Qian Long, Zihan Zhou, Abhibav Gupta, Fei Fang, Yi Wu, Xiaolong Wang
In multi-agent games, the complexity of the environment can grow exponentially as the number of agents increases, so it is particularly challenging to learn good policies when the agent population is large.
Multi-agent Reinforcement Learning reinforcement-learning +1
1 code implementation • ECCV 2020 • Yuan Xue, Zihan Zhou, Xiaolei Huang
To this end, we propose a novel model based on a structure-appearance joint representation learned from both images and wireframes.
1 code implementation • ECCV 2020 • Jia Zheng, Junfei Zhang, Jing Li, Rui Tang, Shenghua Gao, Zihan Zhou
Recently, there has been growing interest in developing learning-based methods to detect and utilize salient semi-global or global structures, such as junctions, lines, planes, cuboids, smooth surfaces, and all types of symmetries, for 3D scene modeling and understanding.
1 code implementation • 13 May 2019 • Huichu Zhang, Siyuan Feng, Chang Liu, Yaoyao Ding, Yichen Zhu, Zihan Zhou, Wei-Nan Zhang, Yong Yu, Haiming Jin, Zhenhui Li
The most commonly used open-source traffic simulator SUMO is, however, not scalable to large road network and large traffic flow, which hinders the study of reinforcement learning on traffic scenarios.
Multi-agent Reinforcement Learning reinforcement-learning +1
1 code implementation • CVPR 2019 • Zehao Yu, Jia Zheng, Dongze Lian, Zihan Zhou, Shenghua Gao
In the first stage, we train a CNN to map each pixel to an embedding space where pixels from the same plane instance have similar embeddings.
Ranked #1 on Plane Instance Segmentation on NYU Depth v2
no code implementations • 14 Jan 2019 • Xuehui Sun, Zihan Zhou, Yuda Fan
Therefore, we aimed at a new field concerning generating review text from customers based on images together with the ratings of online shopping products, which appear as non-image attributes.
1 code implementation • ECCV 2018 • Fengting Yang, Zihan Zhou
In this paper, we study the problem of recovering 3D planar surfaces from a single image of man-made environment.
no code implementations • CVPR 2017 • Dafang He, Xiao Yang, Chen Liang, Zihan Zhou, Alexander G. Ororbi II, Daniel Kifer, C. Lee Giles
Scene text detection has attracted great attention these years.
no code implementations • 22 Nov 2016 • Xiao Yang, Dafang He, Wenyi Huang, Zihan Zhou, Alex Ororbia, Dan Kifer, C. Lee Giles
Physical library collections are valuable and long standing resources for knowledge and learning.
no code implementations • 15 Aug 2016 • Zihan Zhou, Farshid Farhat, James Z. Wang
To overcome this difficulty, we propose a novel vanishing point detection method that exploits global structures in the scene via contour detection.
no code implementations • 8 Jul 2016 • Liansheng Zhuang, Zihan Zhou, Jingwen Yin, Shenghua Gao, Zhouchen Lin, Yi Ma, Nenghai Yu
In the literature, most existing graph-based semi-supervised learning (SSL) methods only use the label information of observed samples in the label propagation stage, while ignoring such valuable information when learning the graph.
no code implementations • 31 May 2016 • Zihan Zhou, Siqiong He, Jia Li, James Z. Wang
The capacity of automatically modeling photographic composition is valuable for many real-world machine vision applications such as digital photography, image retrieval, image understanding, and image aesthetics assessment.
no code implementations • CVPR 2013 • Liansheng Zhuang, Allen Y. Yang, Zihan Zhou, S. Shankar Sastry, Yi Ma
To compensate the missing illumination information typically provided by multiple training images, a sparse illumination transfer (SIT) technique is introduced.
no code implementations • CVPR 2013 • Zihan Zhou, Hailin Jin, Yi Ma
Recently, a new image deformation technique called content-preserving warping (CPW) has been successfully employed to produce the state-of-the-art video stabilization results in many challenging cases.
no code implementations • 3 Nov 2011 • John Wright, Arvind Ganesh, Allen Yang, Zihan Zhou, Yi Ma
This report concerns the use of techniques for sparse signal representation and sparse error correction for automatic face recognition.
no code implementations • 21 Jul 2010 • Allen Y. Yang, Zihan Zhou, Arvind Ganesh, S. Shankar Sastry, Yi Ma
L1-minimization refers to finding the minimum L1-norm solution to an underdetermined linear system b=Ax.
1 code implementation • 21 Jul 2010 • Allen Y. Yang, Zihan Zhou, Arvind Ganesh, S. Shankar Sastry, Yi Ma
L1-minimization refers to finding the minimum L1-norm solution to an underdetermined linear system b=Ax.
1 code implementation • 14 Jan 2010 • Zihan Zhou, XiaoDong Li, John Wright, Emmanuel Candes, Yi Ma
We further prove that the solution to a related convex program (a relaxed PCP) gives an estimate of the low-rank matrix that is simultaneously stable to small entrywise noise and robust to gross sparse errors.
Information Theory Information Theory