Search Results for author: Yazhen Wang

Found 5 papers, 1 papers with code

Overnight GARCH-Itô Volatility Models

no code implementations24 Feb 2021 Donggyu Kim, Minseok Shin, Yazhen Wang

Various parametric volatility models for financial data have been developed to incorporate high-frequency realized volatilities and better capture market dynamics.

SGD Distributional Dynamics of Three Layer Neural Networks

no code implementations30 Dec 2020 Victor Luo, Yazhen Wang, Glenn Fung

In this paper, we seek to extend the mean field results of Mei et al. (2018) from two-layer neural networks with one hidden layer to three-layer neural networks with two hidden layers.

How Many Factors Influence Minima in SGD?

no code implementations24 Sep 2020 Victor Luo, Yazhen Wang

The influencing factors identified in the literature include learning rate, batch size, Hessian, and gradient covariance, and stochastic differential equations are used to model SGD and establish the relationships among these factors for characterizing minima found by SGD.

Asymptotic Analysis via Stochastic Differential Equations of Gradient Descent Algorithms in Statistical and Computational Paradigms

no code implementations27 Nov 2017 Yazhen Wang

We establish gradient flow central limit theorems to describe the limiting dynamic behaviors of these computational algorithms and the large-sample performances of the related statistical procedures, as the number of algorithm iterations and data size both go to infinity, where the gradient flow central limit theorems are governed by some linear ordinary or stochastic differential equations like time-dependent Ornstein-Uhlenbeck processes.

Stochastic Optimization

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