1 code implementation • 30 Aug 2022 • Sándor Kunsági-Máté, Gábor Fáth, István Csabai, Gábor Molnár-Sáska
Recent studies have demonstrated the efficiency of Variational Autoencoders (VAE) to compress high-dimensional implied volatility surfaces into a low dimensional representation.
no code implementations • 27 Jan 2021 • Géza Csörnyei, László Dobos, István Csabai
We investigate the effect of strong emission line galaxies on the performance of empirical photometric redshift estimation methods.
Photometric Redshift Estimation Astrophysics of Galaxies
1 code implementation • 21 Feb 2019 • Dezső Ribli, László Dobos, István Csabai
We present our results from training and evaluating a convolutional neural network (CNN) to predict the shapes of galaxies from wide field survey images.
Cosmology and Nongalactic Astrophysics
1 code implementation • 10 Feb 2019 • Dezső Ribli, Bálint Ármin Pataki, José Manuel Zorrilla Matilla, Daniel Hsu, Zoltán Haiman, István Csabai
Previous studies attempted to extract non-Gaussian information from weak lensing observations through several higher-order statistics such as the three-point correlation function, peak counts or Minkowski-functionals.
Cosmology and Nongalactic Astrophysics
1 code implementation • 15 Jun 2018 • Dezső Ribli, Bálint Ármin Pataki, István Csabai
Gravitational weak lensing is one of the most promising probes of cosmology.
Cosmology and Nongalactic Astrophysics
1 code implementation • 26 Jul 2017 • Dezső Ribli, Anna Horváth, Zsuzsa Unger, Péter Pollner, István Csabai
In the last two decades Computer Aided Diagnostics (CAD) systems were developed to help radiologists analyze screening mammograms.
1 code implementation • 4 Nov 2016 • Róbert Beck, László Dobos, Tamás Budavári, Alexander S. Szalay, István Csabai
Also, the efficient handling of variable filter sets is a necessity for heterogeneous databases, for example the Hubble Source Catalog, and for cross-match services such as SkyQuery.
Astrophysics of Galaxies Instrumentation and Methods for Astrophysics Databases
1 code implementation • 2 Oct 2014 • Dániel Kondor, László Dobos, István Csabai, András Bodor, Gábor Vattay, Tamás Budavári, Alexander S. Szalay
We present a case study about the spatial indexing and regional classification of billions of geographic coordinates from geo-tagged social network data using Hierarchical Triangular Mesh (HTM) implemented for Microsoft SQL Server.
Databases
no code implementations • 5 Nov 2013 • Dániel Kondor, István Csabai, László Dobos, János Szüle, Norbert Barankai, Tamás Hanyecz, Tamás Sebők, Zsófia Kallus, Gábor Vattay
Principal component analysis (PCA) and related techniques have been successfully employed in natural language processing.