Search Results for author: A. Taylan Cemgil

Found 8 papers, 1 papers with code

An Indoor Localization Dataset and Data Collection Framework with High Precision Position Annotation

no code implementations6 Sep 2022 F. Serhan Daniş, A. Teoman Naskali, A. Taylan Cemgil, Cem Ersoy

The technique implements an augmented reality (AR) based positioning system that is used to annotate the wireless signal parameter data samples with high precision position data.

Indoor Localization Position

Autoencoding Variational Autoencoder

1 code implementation7 Dec 2020 A. Taylan Cemgil, Sumedh Ghaisas, Krishnamurthy Dvijotham, Sven Gowal, Pushmeet Kohli

We provide experimental results on the ColorMnist and CelebA benchmark datasets that quantify the properties of the learned representations and compare the approach with a baseline that is specifically trained for the desired property.

Asynchronous Stochastic Quasi-Newton MCMC for Non-Convex Optimization

no code implementations ICML 2018 Umut Şimşekli, Çağatay Yıldız, Thanh Huy Nguyen, Gaël Richard, A. Taylan Cemgil

The results support our theory and show that the proposed algorithm provides a significant speedup over the recently proposed synchronous distributed L-BFGS algorithm.

Stochastic Quasi-Newton Langevin Monte Carlo

no code implementations10 Feb 2016 Umut Şimşekli, Roland Badeau, A. Taylan Cemgil, Gaël Richard

These second order methods directly approximate the inverse Hessian by using a limited history of samples and their gradients.

Second-order methods

HAMSI: A Parallel Incremental Optimization Algorithm Using Quadratic Approximations for Solving Partially Separable Problems

no code implementations5 Sep 2015 Kamer Kaya, Figen Öztoprak, Ş. İlker Birbil, A. Taylan Cemgil, Umut Şimşekli, Nurdan Kuru, Hazal Koptagel, M. Kaan Öztürk

We propose HAMSI (Hessian Approximated Multiple Subsets Iteration), which is a provably convergent, second order incremental algorithm for solving large-scale partially separable optimization problems.

Parallel Stochastic Gradient Markov Chain Monte Carlo for Matrix Factorisation Models

no code implementations3 Jun 2015 Umut Şimşekli, Hazal Koptagel, Hakan Güldaş, A. Taylan Cemgil, Figen Öztoprak, Ş. İlker Birbil

For large matrix factorisation problems, we develop a distributed Markov Chain Monte Carlo (MCMC) method based on stochastic gradient Langevin dynamics (SGLD) that we call Parallel SGLD (PSGLD).

A Bayesian Tensor Factorization Model via Variational Inference for Link Prediction

no code implementations29 Sep 2014 Beyza Ermis, A. Taylan Cemgil

Probabilistic approaches for tensor factorization aim to extract meaningful structure from incomplete data by postulating low rank constraints.

Bayesian Inference Link Prediction +1

An Online Expectation-Maximisation Algorithm for Nonnegative Matrix Factorisation Models

no code implementations11 Jan 2014 Sinan Yildirim, A. Taylan Cemgil, Sumeetpal S. Singh

In this paper we formulate the nonnegative matrix factorisation (NMF) problem as a maximum likelihood estimation problem for hidden Markov models and propose online expectation-maximisation (EM) algorithms to estimate the NMF and the other unknown static parameters.

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