
Nearly Minimax Optimal Rewardfree Reinforcement Learning
We study the rewardfree reinforcement learning framework, which is part...
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Is Reinforcement Learning More Difficult Than Bandits? A Nearoptimal Algorithm Escaping the Curse of Horizon
Episodic reinforcement learning and contextual bandits are two widely st...
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How Neural Networks Extrapolate: From Feedforward to Graph Neural Networks
We study how neural networks trained by gradient descent extrapolate, i....
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On RewardFree Reinforcement Learning with Linear Function Approximation
Rewardfree reinforcement learning (RL) is a framework which is suitable...
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Qlearning with Logarithmic Regret
This paper presents the first nonasymptotic result showing that a model...
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When is Particle Filtering Efficient for POMDP Sequential Planning?
Particle filtering is a popular method for inferring latent states in st...
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Is Long Horizon Reinforcement Learning More Difficult Than Short Horizon Reinforcement Learning?
Learning to plan for long horizons is a central challenge in episodic re...
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Provably Efficient Exploration for RL with Unsupervised Learning
We study how to use unsupervised learning for efficient exploration in r...
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Provable Representation Learning for Imitation Learning via Bilevel Optimization
A common strategy in modern learning systems is to learn a representatio...
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FewShot Learning via Learning the Representation, Provably
This paper studies fewshot learning via representation learning, where ...
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Agnostic Qlearning with Function Approximation in Deterministic Systems: Tight Bounds on Approximation Error and Sample Complexity
The current paper studies the problem of agnostic Qlearning with functi...
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Overparameterized Adversarial Training: An Analysis Overcoming the Curse of Dimensionality
Adversarial training is a popular method to give neural nets robustness ...
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Optimism in Reinforcement Learning with Generalized Linear Function Approximation
We design a new provably efficient algorithm for episodic reinforcement ...
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Enhanced Convolutional Neural Tangent Kernels
Recent research shows that for training with ℓ_2 loss, convolutional neu...
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Continuous Control with Contexts, Provably
A fundamental challenge in artificial intelligence is to build an agent ...
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Is a Good Representation Sufficient for Sample Efficient Reinforcement Learning?
Modern deep learning methods provide an effective means to learn good re...
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Harnessing the Power of Infinitely Wide Deep Nets on Smalldata Tasks
Recent research shows that the following two models are equivalent: (a) ...
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Dual Sequential Monte Carlo: Tunneling Filtering and Planning in Continuous POMDPs
We present the DualSMC network that solves continuous POMDPs by learning...
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Towards Understanding the Importance of Shortcut Connections in Residual Networks
Residual Network (ResNet) is undoubtedly a milestone in deep learning. R...
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Provably Efficient Qlearning with Function Approximation via Distribution Shift Error Checking Oracle
Qlearning with function approximation is one of the most popular method...
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What Can Neural Networks Reason About?
Neural networks have successfully been applied to solving reasoning task...
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Graph Neural Tangent Kernel: Fusing Graph Neural Networks with Graph Kernels
While graph kernels (GKs) are easy to train and enjoy provable theoretic...
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Hitting Time of Stochastic Gradient Langevin Dynamics to Stationary Points: A Direct Analysis
Stochastic gradient Langevin dynamics (SGLD) is a fundamental algorithm ...
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On Exact Computation with an Infinitely Wide Neural Net
How well does a classic deep net architecture like AlexNet or VGG19 clas...
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Global Convergence of Adaptive Gradient Methods for An Overparameterized Neural Network
Adaptive gradient methods like AdaGrad are widely used in optimizing neu...
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Acceleration via Symplectic Discretization of HighResolution Differential Equations
We study firstorder optimization methods obtained by discretizing ordin...
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Provably efficient RL with Rich Observations via Latent State Decoding
We study the exploration problem in episodic MDPs with rich observations...
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FineGrained Analysis of Optimization and Generalization for Overparameterized TwoLayer Neural Networks
Recent works have cast some light on the mystery of why deep nets fit an...
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Width Provably Matters in Optimization for Deep Linear Neural Networks
We prove that for an Llayer fullyconnected linear neural network, if t...
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Gradient Descent Finds Global Minima of Deep Neural Networks
Gradient descent finds a global minimum in training deep neural networks...
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Understanding the Acceleration Phenomenon via HighResolution Differential Equations
Gradientbased optimization algorithms can be studied from the perspecti...
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Gradient Descent Provably Optimizes Overparameterized Neural Networks
One of the mystery in the success of neural networks is randomly initial...
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Algorithmic Regularization in Learning Deep Homogeneous Models: Layers are Automatically Balanced
We study the implicit regularization imposed by gradient descent for lea...
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Robust Nonparametric Regression under Huber's εcontamination Model
We consider the nonparametric regression problem under Huber's ϵcontam...
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How Many Samples are Needed to Learn a Convolutional Neural Network?
A widespread folklore for explaining the success of convolutional neural...
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Improved Learning of Onehiddenlayer Convolutional Neural Networks with Overlaps
We propose a new algorithm to learn a onehiddenlayer convolutional neu...
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Fast and Sample Efficient Inductive Matrix Completion via MultiPhase Procrustes Flow
We revisit the inductive matrix completion problem that aims to recover ...
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On the Power of Overparametrization in Neural Networks with Quadratic Activation
We provide new theoretical insights on why overparametrization is effec...
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NearLinear Time Local Polynomial Nonparametric Estimation
Local polynomial regression (Fan & Gijbels, 1996) is an important class ...
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Linear Convergence of the PrimalDual Gradient Method for ConvexConcave Saddle Point Problems without Strong Convexity
We consider the convexconcave saddle point problem _x_y f(x)+y^ A xg(y...
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Gradient Descent Learns Onehiddenlayer CNN: Don't be Afraid of Spurious Local Minima
We consider the problem of learning a onehiddenlayer neural network wi...
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When is a Convolutional Filter Easy To Learn?
We analyze the convergence of (stochastic) gradient descent algorithm fo...
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Gradient Descent Can Take Exponential Time to Escape Saddle Points
Although gradient descent (GD) almost always escapes saddle points asymp...
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Stochastic Variance Reduction Methods for Policy Evaluation
Policy evaluation is a crucial step in many reinforcementlearning proce...
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Computationally Efficient Robust Estimation of Sparse Functionals
Many conventional statistical procedures are extremely sensitive to seem...
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On the Power of Truncated SVD for General Highrank Matrix Estimation Problems
We show that given an estimate A that is close to a general highrank po...
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Efficient Nonparametric Smoothness Estimation
Sobolev quantities (norms, inner products, and distances) of probability...
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An Improved GapDependency Analysis of the Noisy Power Method
We consider the noisy power method algorithm, which has wide application...
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Simon S. Du
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Research Intern at facebook 2017, Research Intern at Microsoft 2016, Consulting Intern at Accenture 2015, Research Assistant at UC Berkeley from 20132014, Software Engineering Intern at Google 2014, Research Assistant at Bay Area Intellectual Property Group 2013, Consulting Intern at CCID Consulting Co. 2012, PhD in Machine Learning Department at Carnegie Mellon University 20152020