Search Results for author: Xuechen Li

Found 30 papers, 13 papers with code

SCPMan: Shape Context and Prior Constrained Multi-scale Attention Network for Pancreatic Segmentation

no code implementations26 Dec 2023 Leilei Zeng, Xuechen Li, Xinquan Yang, Linlin Shen, Song Wu

Specifically, we proposed a Multi-scale Feature Extraction Module (MFE) and a Mixed-scale Attention Integration Module (MAI) to address unclear pancreas boundaries.

Pancreas Segmentation Segmentation

TCSloT: Text Guided 3D Context and Slope Aware Triple Network for Dental Implant Position Prediction

no code implementations10 Aug 2023 Xinquan Yang, Jinheng Xie, Xuechen Li, Xuguang Li, Linlin Shen, Yongqiang Deng

In this paper, we design a Text Guided 3D Context and Slope Aware Triple Network (TCSloT) which enables the perception of contextual information from multiple adjacent slices and awareness of variation of implant slopes.


TCEIP: Text Condition Embedded Regression Network for Dental Implant Position Prediction

no code implementations26 Jun 2023 Xinquan Yang, Jinheng Xie, Xuguang Li, Xuechen Li, Xin Li, Linlin Shen, Yongqiang Deng

When deep neural network has been proposed to assist the dentist in designing the location of dental implant, most of them are targeting simple cases where only one missing tooth is available.

Position Position regression +1

AlpacaFarm: A Simulation Framework for Methods that Learn from Human Feedback

2 code implementations NeurIPS 2023 Yann Dubois, Xuechen Li, Rohan Taori, Tianyi Zhang, Ishaan Gulrajani, Jimmy Ba, Carlos Guestrin, Percy Liang, Tatsunori B. Hashimoto

As a demonstration of the research possible in AlpacaFarm, we find that methods that use a reward model can substantially improve over supervised fine-tuning and that our reference PPO implementation leads to a +10% improvement in win-rate against Davinci003.

Instruction Following

Two-Stream Regression Network for Dental Implant Position Prediction

no code implementations17 May 2023 Xinquan Yang, Xuguang Li, Xuechen Li, WenTing Chen, Linlin Shen, Xin Li, Yongqiang Deng

In this paper, we develop a two-stream implant position regression framework (TSIPR), which consists of an implant region detector (IRD) and a multi-scale patch embedding regression network (MSPENet), to address this issue.

Position Position regression +1

Exploring the Limits of Differentially Private Deep Learning with Group-wise Clipping

no code implementations3 Dec 2022 Jiyan He, Xuechen Li, Da Yu, Huishuai Zhang, Janardhan Kulkarni, Yin Tat Lee, Arturs Backurs, Nenghai Yu, Jiang Bian

To reduce the compute time overhead of private learning, we show that \emph{per-layer clipping}, where the gradient of each neural network layer is clipped separately, allows clipping to be performed in conjunction with backpropagation in differentially private optimization.

Computational Efficiency

ImplantFormer: Vision Transformer based Implant Position Regression Using Dental CBCT Data

no code implementations29 Oct 2022 Xinquan Yang, Xuguang Li, Xuechen Li, Peixi Wu, Linlin Shen, Yongqiang Deng

In this paper, a transformer-based Implant Position Regression Network, ImplantFormer, is proposed to automatically predict the implant position based on the oral CBCT data.

Position Position regression +1

Synthetic Text Generation with Differential Privacy: A Simple and Practical Recipe

1 code implementation25 Oct 2022 Xiang Yue, Huseyin A. Inan, Xuechen Li, Girish Kumar, Julia McAnallen, Hoda Shajari, Huan Sun, David Levitan, Robert Sim

Privacy concerns have attracted increasing attention in data-driven products due to the tendency of machine learning models to memorize sensitive training data.

Language Modelling Text Generation

A Closer Look at the Calibration of Differentially Private Learners

no code implementations15 Oct 2022 HANLIN ZHANG, Xuechen Li, Prithviraj Sen, Salim Roukos, Tatsunori Hashimoto

Across 7 tasks, temperature scaling and Platt scaling with DP-SGD result in an average 3. 1-fold reduction in the in-domain expected calibration error and only incur at most a minor percent drop in accuracy.

Sample hardness based gradient loss for long-tailed cervical cell detection

no code implementations7 Aug 2022 Minmin Liu, Xuechen Li, Xiangbo Gao, Junliang Chen, Linlin Shen, Huisi Wu

Due to the difficulty of cancer samples collection and annotation, cervical cancer datasets usually exhibit a long-tailed data distribution.

Cell Detection object-detection +1

Large Language Models Can Be Strong Differentially Private Learners

4 code implementations ICLR 2022 Xuechen Li, Florian Tramèr, Percy Liang, Tatsunori Hashimoto

Differentially Private (DP) learning has seen limited success for building large deep learning models of text, and straightforward attempts at applying Differentially Private Stochastic Gradient Descent (DP-SGD) to NLP tasks have resulted in large performance drops and high computational overhead.

On the Opportunities and Risks of Foundation Models

3 code implementations16 Aug 2021 Rishi Bommasani, Drew A. Hudson, Ehsan Adeli, Russ Altman, Simran Arora, Sydney von Arx, Michael S. Bernstein, Jeannette Bohg, Antoine Bosselut, Emma Brunskill, Erik Brynjolfsson, Shyamal Buch, Dallas Card, Rodrigo Castellon, Niladri Chatterji, Annie Chen, Kathleen Creel, Jared Quincy Davis, Dora Demszky, Chris Donahue, Moussa Doumbouya, Esin Durmus, Stefano Ermon, John Etchemendy, Kawin Ethayarajh, Li Fei-Fei, Chelsea Finn, Trevor Gale, Lauren Gillespie, Karan Goel, Noah Goodman, Shelby Grossman, Neel Guha, Tatsunori Hashimoto, Peter Henderson, John Hewitt, Daniel E. Ho, Jenny Hong, Kyle Hsu, Jing Huang, Thomas Icard, Saahil Jain, Dan Jurafsky, Pratyusha Kalluri, Siddharth Karamcheti, Geoff Keeling, Fereshte Khani, Omar Khattab, Pang Wei Koh, Mark Krass, Ranjay Krishna, Rohith Kuditipudi, Ananya Kumar, Faisal Ladhak, Mina Lee, Tony Lee, Jure Leskovec, Isabelle Levent, Xiang Lisa Li, Xuechen Li, Tengyu Ma, Ali Malik, Christopher D. Manning, Suvir Mirchandani, Eric Mitchell, Zanele Munyikwa, Suraj Nair, Avanika Narayan, Deepak Narayanan, Ben Newman, Allen Nie, Juan Carlos Niebles, Hamed Nilforoshan, Julian Nyarko, Giray Ogut, Laurel Orr, Isabel Papadimitriou, Joon Sung Park, Chris Piech, Eva Portelance, Christopher Potts, aditi raghunathan, Rob Reich, Hongyu Ren, Frieda Rong, Yusuf Roohani, Camilo Ruiz, Jack Ryan, Christopher Ré, Dorsa Sadigh, Shiori Sagawa, Keshav Santhanam, Andy Shih, Krishnan Srinivasan, Alex Tamkin, Rohan Taori, Armin W. Thomas, Florian Tramèr, Rose E. Wang, William Wang, Bohan Wu, Jiajun Wu, Yuhuai Wu, Sang Michael Xie, Michihiro Yasunaga, Jiaxuan You, Matei Zaharia, Michael Zhang, Tianyi Zhang, Xikun Zhang, Yuhui Zhang, Lucia Zheng, Kaitlyn Zhou, Percy Liang

AI is undergoing a paradigm shift with the rise of models (e. g., BERT, DALL-E, GPT-3) that are trained on broad data at scale and are adaptable to a wide range of downstream tasks.

Transfer Learning

Learning from Pseudo Lesion: A Self-supervised Framework for COVID-19 Diagnosis

no code implementations23 Jun 2021 Zhongliang Li, Zhihao Jin, Xuechen Li, Linlin Shen

The pairs of normal and pseudo COVID-19 images were then used to train an encoder-decoder architecture based U-Net for image restoration, which does not require any labelled data.

Computed Tomography (CT) COVID-19 Diagnosis +2

Learning to Extend Program Graphs to Work-in-Progress Code

no code implementations28 May 2021 Xuechen Li, Chris J. Maddison, Daniel Tarlow

Source code spends most of its time in a broken or incomplete state during software development.

Code Completion Variable misuse

Efficient and Accurate Gradients for Neural SDEs

2 code implementations NeurIPS 2021 Patrick Kidger, James Foster, Xuechen Li, Terry Lyons

This reduces computational cost (giving up to a $1. 87\times$ speedup) and removes the numerical truncation errors associated with gradient penalty.

Neural SDEs as Infinite-Dimensional GANs

1 code implementation6 Feb 2021 Patrick Kidger, James Foster, Xuechen Li, Harald Oberhauser, Terry Lyons

Stochastic differential equations (SDEs) are a staple of mathematical modelling of temporal dynamics.

Time Series Time Series Analysis

Neural SDEs Made Easy: SDEs are Infinite-Dimensional GANs

no code implementations1 Jan 2021 Patrick Kidger, James Foster, Xuechen Li, Harald Oberhauser, Terry Lyons

Several authors have introduced \emph{Neural Stochastic Differential Equations} (Neural SDEs), often involving complex theory with various limitations.

When Does Preconditioning Help or Hurt Generalization?

no code implementations ICLR 2021 Shun-ichi Amari, Jimmy Ba, Roger Grosse, Xuechen Li, Atsushi Nitanda, Taiji Suzuki, Denny Wu, Ji Xu

While second order optimizers such as natural gradient descent (NGD) often speed up optimization, their effect on generalization has been called into question.

regression Second-order methods

Scalable Gradients and Variational Inference for Stochastic Differential Equations

no code implementations pproximateinference AABI Symposium 2019 Xuechen Li, Ting-Kam Leonard Wong, Ricky T. Q. Chen, David K. Duvenaud

We derive reverse-mode (or adjoint) automatic differentiation for solutions of stochastic differential equations (SDEs), allowing time-efficient and constant-memory computation of pathwise gradients, a continuous-time analogue of the reparameterization trick.

Time Series Time Series Analysis +1

Stochastic Runge-Kutta Accelerates Langevin Monte Carlo and Beyond

no code implementations NeurIPS 2019 Xuechen Li, Denny Wu, Lester Mackey, Murat A. Erdogdu

In this paper, we establish the convergence rate of sampling algorithms obtained by discretizing smooth It\^o diffusions exhibiting fast Wasserstein-$2$ contraction, based on local deviation properties of the integration scheme.

Numerical Integration

A Novel Method for the Absolute Pose Problem with Pairwise Constraints

no code implementations25 Mar 2019 Yinlong Liu, Xuechen Li, Manning Wang, Guang Chen, Zhijian Song, Alois Knoll

In this paper, we consider pairwise constraints and propose a globally optimal algorithm for solving the absolute pose estimation problem.

Pose Estimation Translation

Fast and Globally Optimal Rigid Registration of 3D Point Sets by Transformation Decomposition

no code implementations29 Dec 2018 Xuechen Li, Yinlong Liu, Yiru Wang, Chen Wang, Manning Wang, Zhijian Song

However, the existing global methods are slow for two main reasons: the computational complexity of BnB is exponential to the problem dimensionality (which is six for 3D rigid registration), and the bound evaluation used in BnB is inefficient.


The idemetric property: when most distances are (almost) the same

1 code implementation30 Apr 2018 George Barmpalias, Neng Huang, Andrew Lewis-Pye, Angsheng Li, Xuechen Li, YiCheng Pan, Tim Roughgarden

We introduce the \emph{idemetric} property, which formalises the idea that most nodes in a graph have similar distances between them, and which turns out to be quite standard amongst small-world network models.

Social and Information Networks Discrete Mathematics

Isolating Sources of Disentanglement in Variational Autoencoders

10 code implementations NeurIPS 2018 Ricky T. Q. Chen, Xuechen Li, Roger Grosse, David Duvenaud

We decompose the evidence lower bound to show the existence of a term measuring the total correlation between latent variables.


Inference Suboptimality in Variational Autoencoders

2 code implementations ICML 2018 Chris Cremer, Xuechen Li, David Duvenaud

Furthermore, we show that the parameters used to increase the expressiveness of the approximation play a role in generalizing inference rather than simply improving the complexity of the approximation.

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