Search Results for author: Yu Ji

Found 33 papers, 2 papers with code

3D Fluid Flow Reconstruction Using Compact Light Field PIV

no code implementations ECCV 2020 Zhong Li, Yu Ji, Jingyi Yu, Jinwei Ye

In this paper, we present a PIV solution that uses a compact lenslet-based light field camera to track dense particles floating in the fluid and reconstruct the 3D fluid flow.

Optical Flow Estimation

Metacognition-Enhanced Few-Shot Prompting With Positive Reinforcement

no code implementations14 Dec 2023 Yu Ji, Wen Wu, Yi Hu, Hong Zheng, Liang He

Few-shot prompting elicits the remarkable abilities of large language models by equipping them with a few demonstration examples in the input.

Few-Shot Learning

Text2Bundle: Towards Personalized Query-based Bundle Generation

no code implementations27 Oct 2023 Shixuan Zhu, Chuan Cui, JunTong Hu, Qi Shen, Yu Ji, Zhihua Wei

Bundle generation aims to provide a bundle of items for the user, and has been widely studied and applied on online service platforms.

Towards Multi-Subsession Conversational Recommendation

no code implementations20 Oct 2023 Yu Ji, Qi Shen, Shixuan Zhu, Hang Yu, Yiming Zhang, Chuan Cui, Zhihua Wei

Therefore, we propose a novel conversational recommendation scenario named Multi-Subsession Multi-round Conversational Recommendation (MSMCR), where user would still resort to CRS after several subsessions and might preserve vague interests, and system would proactively ask attributes to activate user interests in the current subsession.

Attribute Recommendation Systems

Textureless Deformable Surface Reconstruction with Invisible Markers

no code implementations25 Aug 2023 Xinyuan Li, Yu Ji, Yanchen Liu, Xiaochen Hu, Jinwei Ye, Changxi Zheng

Leveraging the markers, we design a multi-camera system that captures surface deformation under the UV light and the visible light in a time multiplexing fashion.

3D Reconstruction 3D Shape Reconstruction +1

Is ChatGPT a Good Personality Recognizer? A Preliminary Study

no code implementations8 Jul 2023 Yu Ji, Wen Wu, Hong Zheng, Yi Hu, Xi Chen, Liang He

Concretely, we employ a variety of prompting strategies to explore ChatGPT's ability in recognizing personality from given text, especially the level-oriented prompting strategy we designed for guiding ChatGPT in analyzing given text at a specified level.

Fairness Logical Reasoning +3

Self-Attentive Sequential Recommendation with Cheap Causal Convolutions

no code implementations2 Nov 2022 Jiayi Chen, Wen Wu, Liye Shi, Yu Ji, Wenxin Hu, Xi Chen, Wei Zheng, Liang He

We evaluate the effectiveness of the proposed model in terms of both accurate and calibrated sequential recommendation.

Sequential Recommendation

Designs, Motion Mechanism, Motion Coordination, and Communication of Bionic Robot Fishes: A Survey

no code implementations30 Jun 2022 Zhiwei Yu, Kai Li, Yu Ji, Simon X. Yang

Various methods are needed to narrow the gap in swimming performance between robot fishes and fish.

DACSR: Decoupled-Aggregated End-to-End Calibrated Sequential Recommendation

no code implementations22 Apr 2022 Jiayi Chen, Wen Wu, Liye Shi, Yu Ji, Wenxin Hu, Wei Zheng, Liang He

In this work, we focus on the calibrated recommendations for sequential recommendation, which is connected to both fairness and diversity.

Fairness Sequential Recommendation

Light Field-Based Underwater 3D Reconstruction Via Angular Resampling

no code implementations5 Sep 2021 Yuqi Ding, Zhang Chen, Yu Ji, Jingyi Yu, Jinwei Ye

Recovering 3D geometry of underwater scenes is challenging because of non-linear refraction of light at the water-air interface caused by the camera housing.

3D Reconstruction Depth Estimation

Polarimetric Helmholtz Stereopsis

no code implementations ICCV 2021 Yuqi Ding, Yu Ji, Mingyuan Zhou, Sing Bing Kang, Jinwei Ye

Helmholtz stereopsis (HS) exploits the reciprocity principle of light propagation (i. e., the Helmholtz reciprocity) for 3D reconstruction of surfaces with arbitrary reflectance.

3D Reconstruction

A Neural Rendering Framework for Free-Viewpoint Relighting

2 code implementations CVPR 2020 Zhang Chen, Anpei Chen, Guli Zhang, Chengyuan Wang, Yu Ji, Kiriakos N. Kutulakos, Jingyi Yu

We present a novel Relightable Neural Renderer (RNR) for simultaneous view synthesis and relighting using multi-view image inputs.

Neural Rendering Novel View Synthesis

QGAN: Quantize Generative Adversarial Networks to Extreme low-bits

no code implementations25 Sep 2019 Peiqi Wang, Yu Ji, Xinfeng Xie, Yongqiang Lyu, Dongsheng Wang, Yuan Xie

Despite the success in model reduction of convolutional neural networks (CNNs), neural network quantization methods have not yet been studied on GANs, which are mainly faced with the issues of both the effectiveness of quantization algorithms and the instability of training GAN models.

Quantization

PIV-Based 3D Fluid Flow Reconstruction Using Light Field Camera

no code implementations15 Apr 2019 Zhong Li, Jinwei Ye, Yu Ji, Hao Sheng, Jingyi Yu

Particle Imaging Velocimetry (PIV) estimates the flow of fluid by analyzing the motion of injected particles.

Depth Estimation Optical Flow Estimation

Non-Lambertian Surface Shape and Reflectance Reconstruction Using Concentric Multi-Spectral Light Field

no code implementations9 Apr 2019 Mingyuan Zhou, Yu Ji, Yuqi Ding, Jinwei Ye, S. Susan Young, Jingyi Yu

In this paper, we introduce a novel concentric multi-spectral light field (CMSLF) design that is able to recover the shape and reflectance of surfaces with arbitrary material in one shot.

Depth Estimation

3D Face Reconstruction Using Color Photometric Stereo with Uncalibrated Near Point Lights

no code implementations4 Apr 2019 Zhang Chen, Yu Ji, Mingyuan Zhou, Sing Bing Kang, Jingyi Yu

We avoid the need for spatial constancy of albedo; instead, we use a new measure for albedo similarity that is based on the albedo norm profile.

3D Face Reconstruction Semantic Segmentation

Neural Network Model Extraction Attacks in Edge Devices by Hearing Architectural Hints

no code implementations10 Mar 2019 Xing Hu, Ling Liang, Lei Deng, Shuangchen Li, Xinfeng Xie, Yu Ji, Yufei Ding, Chang Liu, Timothy Sherwood, Yuan Xie

As neural networks continue their reach into nearly every aspect of software operations, the details of those networks become an increasingly sensitive subject.

Cryptography and Security Hardware Architecture

FPSA: A Full System Stack Solution for Reconfigurable ReRAM-based NN Accelerator Architecture

no code implementations28 Jan 2019 Yu Ji, Youyang Zhang, Xinfeng Xie, Shuangchen Li, Peiqi Wang, Xing Hu, Youhui Zhang, Yuan Xie

In this paper, we propose a full system stack solution, composed of a reconfigurable architecture design, Field Programmable Synapse Array (FPSA) and its software system including neural synthesizer, temporal-to-spatial mapper, and placement & routing.

QGAN: Quantized Generative Adversarial Networks

no code implementations24 Jan 2019 Peiqi Wang, Dongsheng Wang, Yu Ji, Xinfeng Xie, Haoxuan Song, XuXin Liu, Yongqiang Lyu, Yuan Xie

The intensive computation and memory requirements of generative adversarial neural networks (GANs) hinder its real-world deployment on edge devices such as smartphones.

Quantization

Programmable Neural Network Trojan for Pre-Trained Feature Extractor

no code implementations23 Jan 2019 Yu Ji, Zixin Liu, Xing Hu, Peiqi Wang, Youhui Zhang

Existing studies have explored the outsourced training attack scenario and transfer learning attack scenario in some small datasets for specific domains, with limited numbers of fixed target classes.

Transfer Learning

TETRIS: TilE-matching the TRemendous Irregular Sparsity

no code implementations NeurIPS 2018 Yu Ji, Ling Liang, Lei Deng, Youyang Zhang, Youhui Zhang, Yuan Xie

Increasing the sparsity granularity can lead to better hardware utilization, but it will compromise the sparsity for maintaining accuracy.

Learning to Dodge A Bullet: Concyclic View Morphing via Deep Learning

no code implementations ECCV 2018 Shi Jin, Ruiynag Liu, Yu Ji, Jinwei Ye, Jingyi Yu

The bullet-time effect, presented in feature film ``The Matrix", has been widely adopted in feature films and TV commercials to create an amazing stopping-time illusion.

Crossbar-aware neural network pruning

no code implementations25 Jul 2018 Ling Liang, Lei Deng, Yueling Zeng, Xing Hu, Yu Ji, Xin Ma, Guoqi Li, Yuan Xie

Crossbar architecture based devices have been widely adopted in neural network accelerators by taking advantage of the high efficiency on vector-matrix multiplication (VMM) operations.

Network Pruning

Robust 3D Human Motion Reconstruction Via Dynamic Template Construction

no code implementations31 Jan 2018 Zhong Li, Yu Ji, Wei Yang, Jinwei Ye, Jingyi Yu

In multi-view human body capture systems, the recovered 3D geometry or even the acquired imagery data can be heavily corrupted due to occlusions, noise, limited field of- view, etc.

Bridging the Gap Between Neural Networks and Neuromorphic Hardware with A Neural Network Compiler

no code implementations15 Nov 2017 Yu Ji, Youhui Zhang, WenGuang Chen, Yuan Xie

Different from developing neural networks (NNs) for general-purpose processors, the development for NN chips usually faces with some hardware-specific restrictions, such as limited precision of network signals and parameters, constrained computation scale, and limited types of non-linear functions.

Ambient Occlusion via Compressive Visibility Estimation

no code implementations CVPR 2015 Wei Yang, Yu Ji, Haiting Lin, Yang Yang, Sing Bing Kang, Jingyi Yu

This enables a sparsity-prior based solution for iteratively recovering the surface normal, the surface albedo, and the visibility function from a small number of images.

Compressive Sensing

Image Pre-compensation: Balancing Contrast and Ringing

no code implementations CVPR 2014 Yu Ji, Jinwei Ye, Sing Bing Kang, Jingyi Yu

In particular, we show that linear tone mapping eliminates ringing but incurs severe contrast loss, while non-linear tone mapping functions such as Gamma curves slightly enhances contrast but introduces ringing.

Tone Mapping

Saliency Detection on Light Field

no code implementations CVPR 2014 Nianyi Li, Jinwei Ye, Yu Ji, Haibin Ling, Jingyi Yu

Existing saliency detection approaches use images as inputs and are sensitive to foreground/background similarities, complex background textures, and occlusions.

Saliency Detection

Reconstructing Gas Flows Using Light-Path Approximation

no code implementations CVPR 2013 Yu Ji, Jinwei Ye, Jingyi Yu

By observing the LF-probe through the gas flow, we acquire a dense set of ray-ray correspondences and then reconstruct their light paths.

Manhattan Scene Understanding via XSlit Imaging

no code implementations CVPR 2013 Jinwei Ye, Yu Ji, Jingyi Yu

Specifically, we prove that parallel 3D lines map to 2D curves in an XSlit image and they converge at an XSlit Vanishing Point (XVP).

Scene Understanding

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