Search Results for author: Zehao Dou

Found 13 papers, 2 papers with code

Think Twice Before You Act: Improving Inverse Problem Solving With MCMC

no code implementations13 Sep 2024 Yaxuan Zhu, Zehao Dou, Haoxin Zheng, Yasi Zhang, Ying Nian Wu, Ruiqi Gao

Despite the merits of being versatile in solving various inverse problems without re-training, the performance of DPS is hindered by the fact that this posterior approximation can be inaccurate especially for high noise levels.

Deblurring Super-Resolution

From optimal score matching to optimal sampling

no code implementations11 Sep 2024 Zehao Dou, Subhodh Kotekal, Zhehao Xu, Harrison H. Zhou

samples from an unknown \(\alpha\)-H\"{o}lder density \(f\) supported on \([-1, 1]\), we prove the minimax rate of estimating the score function of the diffused distribution \(f * \mathcal{N}(0, t)\) with respect to the score matching loss is \(\frac{1}{nt^2} \wedge \frac{1}{nt^{3/2}} \wedge (t^{\alpha-1} + n^{-2(\alpha-1)/(2\alpha+1)})\) for all \(\alpha > 0\) and \(t \ge 0\).

Density Estimation

Diffusion Transformer Captures Spatial-Temporal Dependencies: A Theory for Gaussian Process Data

no code implementations23 Jul 2024 Hengyu Fu, Zehao Dou, Jiawei Guo, Mengdi Wang, Minshuo Chen

Diffusion Transformer, the backbone of Sora for video generation, successfully scales the capacity of diffusion models, pioneering new avenues for high-fidelity sequential data generation.

Video Generation

Provable Statistical Rates for Consistency Diffusion Models

no code implementations23 Jun 2024 Zehao Dou, Minshuo Chen, Mengdi Wang, Zhuoran Yang

Diffusion models have revolutionized various application domains, including computer vision and audio generation.

Audio Generation

FairVision: Equitable Deep Learning for Eye Disease Screening via Fair Identity Scaling

no code implementations3 Oct 2023 Yan Luo, Muhammad Osama Khan, Yu Tian, Min Shi, Zehao Dou, Tobias Elze, Yi Fang, Mengyu Wang

To address this research gap, we conduct the first comprehensive study on the fairness of 3D medical imaging models across multiple protected attributes.

Fairness

Learning Narrow One-Hidden-Layer ReLU Networks

no code implementations20 Apr 2023 Sitan Chen, Zehao Dou, Surbhi Goel, Adam R Klivans, Raghu Meka

We consider the well-studied problem of learning a linear combination of $k$ ReLU activations with respect to a Gaussian distribution on inputs in $d$ dimensions.

Understanding Value Decomposition Algorithms in Deep Cooperative Multi-Agent Reinforcement Learning

no code implementations10 Feb 2022 Zehao Dou, Jakub Grudzien Kuba, Yaodong Yang

Value function decomposition is becoming a popular rule of thumb for scaling up multi-agent reinforcement learning (MARL) in cooperative games.

Multi-agent Reinforcement Learning reinforcement-learning +1

On the One-sided Convergence of Adam-type Algorithms in Non-convex Non-concave Min-max Optimization

no code implementations29 Sep 2021 Zehao Dou, Yuanzhi Li

To the best of our knowledge, this is the very first result which provides an empirical observation and a strict theoretical guarantee on the one-sided convergence of Adam-type algorithms in min-max optimization.

Vocal Bursts Type Prediction

Gap-Dependent Bounds for Two-Player Markov Games

no code implementations1 Jul 2021 Zehao Dou, Zhuoran Yang, Zhaoran Wang, Simon S. Du

As one of the most popular methods in the field of reinforcement learning, Q-learning has received increasing attention.

Q-Learning Vocal Bursts Valence Prediction

Diffusion Mechanism in Residual Neural Network: Theory and Applications

1 code implementation7 May 2021 Tangjun Wang, Zehao Dou, Chenglong Bao, Zuoqiang Shi

In many learning tasks with limited training samples, the diffusion connects the labeled and unlabeled data points and is a critical component for achieving high classification accuracy.

Binary Classification Classification +4

Making Method of Moments Great Again? -- How can GANs learn distributions

no code implementations9 Mar 2020 Yuanzhi Li, Zehao Dou

In GANs, the training of the generator usually stops when the discriminator can no longer distinguish the generator's output from the set of training examples.

Mathematical Analysis of Adversarial Attacks

no code implementations15 Nov 2018 Zehao Dou, Stanley J. Osher, Bao Wang

In this paper, we analyze efficacy of the fast gradient sign method (FGSM) and the Carlini-Wagner's L2 (CW-L2) attack.

General Classification

Hierarchical Attention: What Really Counts in Various NLP Tasks

1 code implementation10 Aug 2018 Zehao Dou, Zhihua Zhang

Ham achieves a state-of-the-art BLEU score of 0. 26 on Chinese poem generation task and a nearly 6. 5% averaged improvement compared with the existing machine reading comprehension models such as BIDAF and Match-LSTM.

Machine Reading Comprehension Machine Translation +5

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