Search Results for author: Xiang Yu

Found 69 papers, 10 papers with code

Identifying and Handling Cross-Treebank Inconsistencies in UD: A Pilot Study

1 code implementation UDW (COLING) 2020 Tillmann Dönicke, Xiang Yu, Jonas Kuhn

The Universal Dependencies treebanks are a still-growing collection of treebanks for a wide range of languages, all annotated with a common inventory of dependency relations.

Optimal portfolio under ratio-type periodic evaluation in incomplete markets with stochastic factors

no code implementations26 Jan 2024 Wenyuan Wang, Kaixin Yan, Xiang Yu

With the help of the duality results in the auxiliary problems and some fixed point arguments, we further derive and verify the optimal portfolio processes in a periodic manner for the original periodic evaluation problems over an infinite horizon.

Management

Application of 2D Homography for High Resolution Traffic Data Collection using CCTV Cameras

no code implementations14 Jan 2024 Linlin Zhang, Xiang Yu, Abdulateef Daud, Abdul Rashid Mussah, Yaw Adu-Gyamfi

This study implements a three-stage video analytics framework for extracting high-resolution traffic data such vehicle counts, speed, and acceleration from infrastructure-mounted CCTV cameras.

Camera Calibration Object Recognition

3D Object Detection and High-Resolution Traffic Parameters Extraction Using Low-Resolution LiDAR Data

no code implementations13 Jan 2024 Linlin Zhang, Xiang Yu, Armstrong Aboah, Yaw Adu-Gyamfi

These are the need for multiple LiDAR systems to obtain complete point cloud information of objects of interest, as well as the labor-intensive process of annotating 3D bounding boxes for object detection tasks.

3D Object Detection object-detection +2

OpEnCam: Lensless Optical Encryption Camera

no code implementations2 Dec 2023 Salman S. Khan, Xiang Yu, Kaushik Mitra, Manmohan Chandraker, Francesco Pittaluga

OpEnCam encrypts the incoming light before capturing it using the modulating ability of optical masks.

On optimal tracking portfolio in incomplete markets: The classical control and the reinforcement learning approaches

no code implementations24 Nov 2023 Lijun Bo, YiJie Huang, Xiang Yu

This paper studies an infinite horizon optimal tracking portfolio problem using capital injection in incomplete market models.

Q-Learning

Optimal Portfolio with Ratio Type Periodic Evaluation under Short-Selling Prohibition

no code implementations21 Nov 2023 Wenyuan Wang, Kaixin Yan, Xiang Yu

With the help of the results from the auxiliary problem, the value function and the optimal constrained portfolio for the original problem with periodic evaluation can be derived and verified, allowing us to discuss some financial implications under the new performance paradigm.

Augment the Pairs: Semantics-Preserving Image-Caption Pair Augmentation for Grounding-Based Vision and Language Models

1 code implementation5 Nov 2023 Jingru Yi, Burak Uzkent, Oana Ignat, Zili Li, Amanmeet Garg, Xiang Yu, Linda Liu

While we demonstrate our data augmentation method with MDETR framework, the proposed approach is applicable to common grounding-based vision and language tasks with other frameworks.

Data Augmentation Phrase Grounding +1

Trustworthy Representation Learning Across Domains

no code implementations23 Aug 2023 Ronghang Zhu, Dongliang Guo, Daiqing Qi, Zhixuan Chu, Xiang Yu, Sheng Li

Inspired by the concepts in trustworthy AI, we proposed the first trustworthy representation learning across domains framework which includes four concepts, i. e, robustness, privacy, fairness, and explainability, to give a comprehensive literature review on this research direction.

Fairness Representation Learning

Fault Separation Based on An Excitation Operator with Application to a Quadrotor UAV

no code implementations20 Aug 2023 Sicheng Zhou, Meng Wang, Jindou Jia, Kexin Guo, Xiang Yu, Youmin Zhang, Lei Guo

This paper presents an excitation operator based fault separation architecture for a quadrotor unmanned aerial vehicle (UAV) subject to loss of effectiveness (LoE) faults, actuator aging, and load uncertainty.

Continuous-time q-learning for mean-field control problems

no code implementations28 Jun 2023 Xiaoli Wei, Xiang Yu

This paper studies the q-learning, recently coined as the continuous time counterpart of Q-learning by Jia and Zhou (2023), for continuous time Mckean-Vlasov control problems in the setting of entropy-regularized reinforcement learning.

Q-Learning

Selective Structured State-Spaces for Long-Form Video Understanding

no code implementations CVPR 2023 Jue Wang, Wentao Zhu, Pichao Wang, Xiang Yu, Linda Liu, Mohamed Omar, Raffay Hamid

To address this limitation, we present a novel Selective S4 (i. e., S5) model that employs a lightweight mask generator to adaptively select informative image tokens resulting in more efficient and accurate modeling of long-term spatiotemporal dependencies in videos.

Contrastive Learning Token Reduction +2

On time-consistent equilibrium stopping under aggregation of diverse discount rates

no code implementations15 Feb 2023 Shuoqing Deng, Xiang Yu, Jiacheng Zhang

When the sufficient condition of the attitude function is violated, we can illustrate by various examples that the characterization of the optimal equilibrium may differ significantly from some existing results for an individual agent.

Decision Making

Learning Phase Mask for Privacy-Preserving Passive Depth Estimation

no code implementations European Conference on Computer Vision (ECCV) 2022 Zaid Tasneem, Giovanni Milione, Yi-Hsuan Tsai, Xiang Yu, Ashok Veeraraghavan, Manmohan Chandraker, Francesco Pittaluga

With over a billion sold each year, cameras are not only becoming ubiquitous and omnipresent, but are driving progress in a wide range of applications such as augmented/virtual reality, robotics, surveillance, security, autonomous navigation and many others.

Autonomous Navigation Depth Estimation +2

EMC2A-Net: An Efficient Multibranch Cross-channel Attention Network for SAR Target Classification

no code implementations3 Aug 2022 Xiang Yu, Zhe Geng, Xiaohua Huang, Qinglu Wang, Daiyin Zhu

In recent years, convolutional neural networks (CNNs) have shown great potential in synthetic aperture radar (SAR) target recognition.

Dimensionality Reduction

A mean field game approach to equilibrium consumption under external habit formation

no code implementations27 Jun 2022 Lijun Bo, Shihua Wang, Xiang Yu

This paper studies the equilibrium consumption under external habit formation in a large population of agents.

Controllable Dynamic Multi-Task Architectures

no code implementations CVPR 2022 Dripta S. Raychaudhuri, Yumin Suh, Samuel Schulter, Xiang Yu, Masoud Faraki, Amit K. Roy-Chowdhury, Manmohan Chandraker

In contrast to the existing dynamic multi-task approaches that adjust only the weights within a fixed architecture, our approach affords the flexibility to dynamically control the total computational cost and match the user-preferred task importance better.

Multi-Task Learning

Single-Stream Multi-Level Alignment for Vision-Language Pretraining

1 code implementation27 Mar 2022 Zaid Khan, Vijay Kumar BG, Xiang Yu, Samuel Schulter, Manmohan Chandraker, Yun Fu

Self-supervised vision-language pretraining from pure images and text with a contrastive loss is effective, but ignores fine-grained alignment due to a dual-stream architecture that aligns image and text representations only on a global level.

Question Answering Referring Expression +4

On Generalizing Beyond Domains in Cross-Domain Continual Learning

no code implementations CVPR 2022 Christian Simon, Masoud Faraki, Yi-Hsuan Tsai, Xiang Yu, Samuel Schulter, Yumin Suh, Mehrtash Harandi, Manmohan Chandraker

Humans have the ability to accumulate knowledge of new tasks in varying conditions, but deep neural networks often suffer from catastrophic forgetting of previously learned knowledge after learning a new task.

Continual Learning Knowledge Distillation

Mean Field Game of Optimal Relative Investment with Jump Risk

no code implementations2 Aug 2021 Lijun Bo, Shihua Wang, Xiang Yu

This paper studies the n-player game and the mean field game under the CRRA relative performance on terminal wealth, in which the interaction occurs by peer competition.

Cross-Domain Similarity Learning for Face Recognition in Unseen Domains

no code implementations CVPR 2021 Masoud Faraki, Xiang Yu, Yi-Hsuan Tsai, Yumin Suh, Manmohan Chandraker

Intuitively, it discriminatively correlates explicit metrics derived from one domain, with triplet samples from another domain in a unified loss function to be minimized within a network, which leads to better alignment of the training domains.

Face Recognition Metric Learning

Synthetic Generation of Three-Dimensional Cancer Cell Models from Histopathological Images

no code implementations26 Jan 2021 Yoav Alon, Xiang Yu, Huiyu Zhou

Synthetic generation of three-dimensional cell models from histopathological images aims to enhance understanding of cell mutation, and progression of cancer, necessary for clinical assessment and optimal treatment.

Image Registration Style Transfer

Real-Valued Logics for Typological Universals: Framework and Application

no code implementations COLING 2020 Tillmann D{\"o}nicke, Xiang Yu, Jonas Kuhn

This paper proposes a framework for the expression of typological statements which uses real-valued logics to capture the empirical truth value (truth degree) of a formula on a given data source, e. g. a collection of multilingual treebanks with comparable annotation.

Uncertainty-Aware Physically-Guided Proxy Tasks for Unseen Domain Face Anti-spoofing

no code implementations28 Nov 2020 Junru Wu, Xiang Yu, Buyu Liu, Zhangyang Wang, Manmohan Chandraker

Face anti-spoofing (FAS) seeks to discriminate genuine faces from fake ones arising from any type of spoofing attack.

Attribute Domain Generalization +1

WeiPS: a symmetric fusion model framework for large-scale online learning

no code implementations24 Nov 2020 Xiang Yu, Fuping Chu, Junqi Wu, Bo Huang

The recommendation system is an important commercial application of machine learning, where billions of feed views in the information flow every day.

Improving Face Recognition by Clustering Unlabeled Faces in the Wild

no code implementations ECCV 2020 Aruni RoyChowdhury, Xiang Yu, Kihyuk Sohn, Erik Learned-Miller, Manmohan Chandraker

While deep face recognition has benefited significantly from large-scale labeled data, current research is focused on leveraging unlabeled data to further boost performance, reducing the cost of human annotation.

Clustering Face Clustering +3

Ensemble Self-Training for Low-Resource Languages: Grapheme-to-Phoneme Conversion and Morphological Inflection

no code implementations WS 2020 Xiang Yu, Ngoc Thang Vu, Jonas Kuhn

We present an iterative data augmentation framework, which trains and searches for an optimal ensemble and simultaneously annotates new training data in a self-training style.

Data Augmentation Morphological Inflection

Optimal Tracking Portfolio with A Ratcheting Capital Benchmark

no code implementations24 Jun 2020 Lijun Bo, Huafu Liao, Xiang Yu

We first transform the original problem with floor constraints into an unconstrained control problem, however, under a running maximum cost.

Management

Optimal Consumption with Reference to Past Spending Maximum

no code implementations12 Jun 2020 Shuoqing Deng, Xun Li, Huyen Pham, Xiang Yu

This paper studies the infinite-horizon optimal consumption with a path-dependent reference under exponential utility.

A refined dynamic finite-strain shell theory for incompressible hyperelastic materials: equations and two-dimensional shell virtual work principle

no code implementations9 Jun 2020 Xiang Yu, Yibin Fu, Hui-Hui Dai

Based on previous work for the static problem, in this paper we first derive one form of dynamic finite-strain shell equations for incompressible hyperelastic materials that involve three shell constitutive relations.

Computational Engineering, Finance, and Science Biological Physics

DAVID: Dual-Attentional Video Deblurring

no code implementations7 Dec 2019 Junru Wu, Xiang Yu, Ding Liu, Manmohan Chandraker, Zhangyang Wang

To train and evaluate on more diverse blur severity levels, we propose a Challenging DVD dataset generated from the raw DVD video set by pooling frames with different temporal windows.

Deblurring

Head-First Linearization with Tree-Structured Representation

no code implementations WS 2019 Xiang Yu, Agnieszka Falenska, Ngoc Thang Vu, Jonas Kuhn

We present a dependency tree linearization model with two novel components: (1) a tree-structured encoder based on bidirectional Tree-LSTM that propagates information first bottom-up then top-down, which allows each token to access information from the entire tree; and (2) a linguistically motivated head-first decoder that emphasizes the central role of the head and linearizes the subtree by incrementally attaching the dependents on both sides of the head.

Optimal Dividend Strategy for an Insurance Group with Contagious Default Risk

no code implementations20 Sep 2019 Zhuo Jin, Huafu Liao, Yue Yang, Xiang Yu

This paper studies the optimal dividend for a multi-line insurance group, in which each subsidiary runs a product line and is exposed to some external credit risk.

Lifetime Ruin under High-watermark Fees and Drift Uncertainty

no code implementations3 Sep 2019 Junbeom Lee, Xiang Yu, Chao Zhou

This paper aims to make a new contribution to the study of lifetime ruin problem by considering investment in two hedge funds with high-watermark fees and drift uncertainty.

Dimensionality Reduction Vocal Bursts Intensity Prediction

Learning the Dyck Language with Attention-based Seq2Seq Models

no code implementations WS 2019 Xiang Yu, Ngoc Thang Vu, Jonas Kuhn

The generalized Dyck language has been used to analyze the ability of Recurrent Neural Networks (RNNs) to learn context-free grammars (CFGs).

Pose-variant 3D Facial Attribute Generation

no code implementations24 Jul 2019 Feng-Ju Chang, Xiang Yu, Ram Nevatia, Manmohan Chandraker

We address the challenging problem of generating facial attributes using a single image in an unconstrained pose.

3D Reconstruction Attribute +1

Optimal Stopping under Model Ambiguity: a Time-Consistent Equilibrium Approach

no code implementations4 Jun 2019 Yu-Jui Huang, Xiang Yu

This allows us to capture much more diverse behavior, depending on an agent's ambiguity attitude, beyond the standard worst-case (or best-case) analysis.

Decision Making

Risk-Sensitive Credit Portfolio Optimization under Partial Information and Contagion Risk

no code implementations20 May 2019 Lijun Bo, Huafu Liao, Xiang Yu

The verification theorem can be concluded with the aid of our BSDE results, which in turn yields the uniqueness of the solution to the BSDE.

Portfolio Optimization

Unsupervised Domain Adaptation for Distance Metric Learning

no code implementations ICLR 2019 Kihyuk Sohn, Wenling Shang, Xiang Yu, Manmohan Chandraker

Unsupervised domain adaptation is a promising avenue to enhance the performance of deep neural networks on a target domain, using labels only from a source domain.

Face Recognition Metric Learning +1

Marshall-Olkin Power-Law Distributions in Length-Frequency of Entities

1 code implementation8 Nov 2018 Xiaoshi Zhong, Xiang Yu, Erik Cambria, Jagath C. Rajapakse

Entities have different forms in different linguistic tasks and researchers treat those different forms as different concepts.

Approximate Dynamic Oracle for Dependency Parsing with Reinforcement Learning

no code implementations WS 2018 Xiang Yu, Ngoc Thang Vu, Jonas Kuhn

We present a general approach with reinforcement learning (RL) to approximate dynamic oracles for transition systems where exact dynamic oracles are difficult to derive.

Dependency Parsing Imitation Learning +4

Comparing Attention-based Convolutional and Recurrent Neural Networks: Success and Limitations in Machine Reading Comprehension

1 code implementation CONLL 2018 Matthias Blohm, Glorianna Jagfeld, Ekta Sood, Xiang Yu, Ngoc Thang Vu

We propose a machine reading comprehension model based on the compare-aggregate framework with two-staged attention that achieves state-of-the-art results on the MovieQA question answering dataset.

Machine Reading Comprehension Question Answering

Feature Transfer Learning for Deep Face Recognition with Under-Represented Data

no code implementations23 Mar 2018 Xi Yin, Xiang Yu, Kihyuk Sohn, Xiaoming Liu, Manmohan Chandraker

In this paper, we propose a center-based feature transfer framework to augment the feature space of under-represented subjects from the regular subjects that have sufficiently diverse samples.

Disentanglement Face Recognition +1

Gotta Adapt 'Em All: Joint Pixel and Feature-Level Domain Adaptation for Recognition in the Wild

1 code implementation CVPR 2019 Luan Tran, Kihyuk Sohn, Xiang Yu, Xiaoming Liu, Manmohan Chandraker

Recent developments in deep domain adaptation have allowed knowledge transfer from a labeled source domain to an unlabeled target domain at the level of intermediate features or input pixels.

Attribute Domain Adaptation +2

Deep Supervision with Intermediate Concepts

no code implementations8 Jan 2018 Chi Li, M. Zeeshan Zia, Quoc-Huy Tran, Xiang Yu, Gregory D. Hager, Manmohan Chandraker

In this work, we explore an approach for injecting prior domain structure into neural network training by supervising hidden layers of a CNN with intermediate concepts that normally are not observed in practice.

Image Classification

Learning Efficient Object Detection Models with Knowledge Distillation

no code implementations NeurIPS 2017 Guobin Chen, Wongun Choi, Xiang Yu, Tony Han, Manmohan Chandraker

In this work, we propose a new framework to learn compact and fast ob- ject detection networks with improved accuracy using knowledge distillation [20] and hint learning [34].

Knowledge Distillation Model Compression +4

Unsupervised Domain Adaptation for Face Recognition in Unlabeled Videos

no code implementations ICCV 2017 Kihyuk Sohn, Sifei Liu, Guangyu Zhong, Xiang Yu, Ming-Hsuan Yang, Manmohan Chandraker

Despite rapid advances in face recognition, there remains a clear gap between the performance of still image-based face recognition and video-based face recognition, due to the vast difference in visual quality between the domains and the difficulty of curating diverse large-scale video datasets.

Data Augmentation Face Recognition +1

A General-Purpose Tagger with Convolutional Neural Networks

1 code implementation WS 2017 Xiang Yu, Agnieszka Faleńska, Ngoc Thang Vu

We present a general-purpose tagger based on convolutional neural networks (CNN), used for both composing word vectors and encoding context information.

Morphological Tagging Part-Of-Speech Tagging

Character Composition Model with Convolutional Neural Networks for Dependency Parsing on Morphologically Rich Languages

1 code implementation ACL 2017 Xiang Yu, Ngoc Thang Vu

We present a transition-based dependency parser that uses a convolutional neural network to compose word representations from characters.

Dependency Parsing Word Embeddings

Towards Large-Pose Face Frontalization in the Wild

no code implementations ICCV 2017 Xi Yin, Xiang Yu, Kihyuk Sohn, Xiaoming Liu, Manmohan Chandraker

Despite recent advances in face recognition using deep learning, severe accuracy drops are observed for large pose variations in unconstrained environments.

3D Reconstruction Face Recognition +1

Reconstruction-Based Disentanglement for Pose-invariant Face Recognition

no code implementations ICCV 2017 Xi Peng, Xiang Yu, Kihyuk Sohn, Dimitris Metaxas, Manmohan Chandraker

Finally, we propose a new feature reconstruction metric learning to explicitly disentangle identity and pose, by demanding alignment between the feature reconstructions through various combinations of identity and pose features, which is obtained from two images of the same subject.

Disentanglement Face Recognition +2

Deep Deformation Network for Object Landmark Localization

no code implementations3 May 2016 Xiang Yu, Feng Zhou, Manmohan Chandraker

We propose a novel cascaded framework, namely deep deformation network (DDN), for localizing landmarks in non-rigid objects.

Face Alignment Object +1

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