Search Results for author: Dong-Young Lim

Found 5 papers, 3 papers with code

On diffusion-based generative models and their error bounds: The log-concave case with full convergence estimates

no code implementations22 Nov 2023 Stefano Bruno, Ying Zhang, Dong-Young Lim, Ömer Deniz Akyildiz, Sotirios Sabanis

As a result, we obtain the best known upper bound estimates in terms of key quantities of interest, such as the dimension and rates of convergence, for the Wasserstein-2 distance between the data distribution (Gaussian with unknown mean) and our sampling algorithm.

Langevin dynamics based algorithm e-TH$\varepsilon$O POULA for stochastic optimization problems with discontinuous stochastic gradient

1 code implementation24 Oct 2022 Dong-Young Lim, Ariel Neufeld, Sotirios Sabanis, Ying Zhang

We introduce a new Langevin dynamics based algorithm, called e-TH$\varepsilon$O POULA, to solve optimization problems with discontinuous stochastic gradients which naturally appear in real-world applications such as quantile estimation, vector quantization, CVaR minimization, and regularized optimization problems involving ReLU neural networks.

Portfolio Optimization Quantization +2

Non-asymptotic estimates for TUSLA algorithm for non-convex learning with applications to neural networks with ReLU activation function

1 code implementation19 Jul 2021 Dong-Young Lim, Ariel Neufeld, Sotirios Sabanis, Ying Zhang

To illustrate the applicability of the main results, we consider an example from transfer learning with ReLU neural networks, which represents a key paradigm in machine learning.

Stochastic Optimization Transfer Learning

A Neural Frequency-Severity Model and Its Application to Insurance Claims

no code implementations20 Jun 2021 Dong-Young Lim

The proposed model is able to capture nonlinear relationships in explanatory variables by characterizing the logarithmic mean functions of frequency and severity distributions as neural networks.

Polygonal Unadjusted Langevin Algorithms: Creating stable and efficient adaptive algorithms for neural networks

1 code implementation28 May 2021 Dong-Young Lim, Sotirios Sabanis

We present a new class of Langevin based algorithms, which overcomes many of the known shortcomings of popular adaptive optimizers that are currently used for the fine tuning of deep learning models.

Stochastic Optimization

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