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Algorithms of the LDA model [REPORT] [article]

Jaka Špeh, Andrej Muhič, Jan Rupnik
2013 arXiv   pre-print
We review three algorithms for Latent Dirichlet Allocation (LDA). Two of them are variational inference algorithms: Variational Bayesian inference and Online Variational Bayesian inference and one is Markov Chain Monte Carlo (MCMC) algorithm -- Collapsed Gibbs sampling. We compare their time complexity and performance. We find that online variational Bayesian inference is the fastest algorithm and still returns reasonably good results.
arXiv:1307.0317v1 fatcat:a6hnprs5gra77k5tys2hnhryji

News Across Languages - Cross-Lingual Document Similarity and Event Tracking [article]

Jan Rupnik, Andrej Muhic, Gregor Leban, Primoz Skraba, Blaz Fortuna, Marko Grobelnik
2015 arXiv   pre-print
In today's world, we follow news which is distributed globally. Significant events are reported by different sources and in different languages. In this work, we address the problem of tracking of events in a large multilingual stream. Within a recently developed system Event Registry we examine two aspects of this problem: how to compare articles in different languages and how to link collections of articles in different languages which refer to the same event. Taking a multilingual stream and
more » ... clusters of articles from each language, we compare different cross-lingual document similarity measures based on Wikipedia. This allows us to compute the similarity of any two articles regardless of language. Building on previous work, we show there are methods which scale well and can compute a meaningful similarity between articles from languages with little or no direct overlap in the training data. Using this capability, we then propose an approach to link clusters of articles across languages which represent the same event. We provide an extensive evaluation of the system as a whole, as well as an evaluation of the quality and robustness of the similarity measure and the linking algorithm.
arXiv:1512.07046v1 fatcat:5vbwcxioxbdqdbr6rbsf5dyeri

On the singular two-parameter eigenvalue problem

Andrej Muhic, Bor Plestenjak
2009 The Electronic Journal of Linear Algebra  
Apart from a few theoretical results and numerical methods in [4] and [13] , which only cover very specific examples, the singular two-parameter eigenvalue problem is ELA 422 Andrej Muhič and Bor Plestenjak  ...  If Electronic Journal of Linear Algebra ISSN 1081-3810 A publication of the International Linear Algebra Society Volume 18, pp. 420-437, July 2009 ELA 428 Andrej Muhič and Bor Plestenjak Lemma  ...  Andrej Muhič and Bor Plestenjak for the numerical computation of roots of such systems.  ... 
doi:10.13001/1081-3810.1322 fatcat:gbaenhubo5ftrkno64xp7jolti

Wall Roughness Influence on the Efficiency Characteristics of Centrifugal Pump

Andrej Lipej, Simon Muhič, Duško Mitruševski
2017 Strojniski vestnik  
-Muhič, S. -Mitruševski, D.  ...  Andrej Lipej 1 -Simon Muhič 1,* -Duško Mitruševski 2 The accuracy of numerical prediction of energetic characteristics is very important for the development process of centrifugal pumps. • One of the important  ... 
doi:10.5545/sv-jme.2017.4526 fatcat:iirbot6glvajhirfpynb2ygaha

On the quadratic two-parameter eigenvalue problem and its linearization

Andrej Muhič, Bor Plestenjak
2010 Linear Algebra and its Applications  
AMS classification: 65F15 15A18 15A69 15A22 Keywords: Two-parameter quadratic eigenvalue problem Singular two-parameter eigenvalue problem Model updating Linearization Kronecker canonical form We introduce the quadratic two-parameter eigenvalue problem and linearize it as a singular two-parameter eigenvalue problem. This, together with an example from model updating, shows the need for numerical methods for singular two-parameter eigenvalue problems and for a better understanding of such
more » ... s. There are various numerical methods for two-parameter eigenvalue problems, but only few for nonsingular ones. We present a method that can be applied to singular two-parameter eigenvalue problems including the linearization of the quadratic two-parameter eigenvalue problem. It is based on the staircase algorithm for the extraction of the common regular part of two singular matrix pencils.
doi:10.1016/j.laa.2009.12.022 fatcat:y2kai3sylrbcvh2e6o6aqyxfva

On linearizations of the quadratic two-parameter eigenvalue problem

Michiel E. Hochstenbach, Andrej Muhič, Bor Plestenjak
2012 Linear Algebra and its Applications  
We present several transformations that can be used to solve the quadratic two-parameter eigenvalue problem (QMEP), by formulating an associated linear multiparameter eigenvalue problem. Two of these transformations are generalizations of the well-known linearization of the quadratic eigenvalue problem and linearize the QMEP as a singular two-parameter eigenvalue problem. The third replaces all nonlinear terms by new variables and adds new equations for their relations. The QMEP is thus
more » ... med into a nonsingular five-parameter eigenvalue problem. The advantage of these transformations is that they enable one to solve the QMEP using existing numerical methods for multiparameter eigenvalue problems. We also consider several special cases of the QMEP, where some matrix coefficients are zero.
doi:10.1016/j.laa.2011.07.026 fatcat:kvhkrfaoe5hippdv2orc3sjdkq

Jacobi–Davidson methods for polynomial two-parameter eigenvalue problems

Michiel E. Hochstenbach, Andrej Muhič, Bor Plestenjak
2015 Journal of Computational and Applied Mathematics  
Muhič), bor.plestenjak@fmf.uni-lj.si (Bor Plestenjak) URL: http://www.win.tue.nl/~hochsten/ (Michiel E.  ...  polynomial two-parameter eigenvalue problem (PMEP) P 1 (λ, µ) x 1 = k i=0 k−i j=0 λ i µ j A ij x 1 = 0, (1) P 2 (λ, µ) x 2 = k i=0 k−i j=0 λ i µ j B ij x 2 = 0, Email addresses: andrej.muhic@fmf.uni-lj.si (Andrej  ... 
doi:10.1016/j.cam.2015.04.019 fatcat:5kpwi75a2naafnpvhvmiwt5g7y

A method for computing all values λ such that A+λB has a multiple eigenvalue

Andrej Muhič, Bor Plestenjak
2014 Linear Algebra and its Applications  
Given a pair of n × n matrices A and B, we consider the problem of finding values λ such that the matrix A + λB has a multiple eigenvalue. Our approach solves the problem using only the standard matrix computation tools. By formulating the problem as a singular two-parameter eigenvalue problem, we construct matrices ∆ 1 and ∆ 0 of size 3n 2 × 3n 2 with the property that the regular eigenvalues of the singular pencil ∆ 1 − λ∆ 0 are the values λ, such that A + λB has a multiple eigenvalue. We
more » ... that these values can be computed numerically from ∆ 1 and ∆ 0 by the staircase algorithm.
doi:10.1016/j.laa.2013.10.015 fatcat:is4mbruv35httjwwb5sklf6m6e

News Across Languages - Cross-Lingual Document Similarity and Event Tracking (Extended Abstract)

Jan Rupnik, Andrej Muhič, Gregor Leban, Blaž Fortuna, Marko Grobelnik
2017 Proceedings of the Twenty-Sixth International Joint Conference on Artificial Intelligence  
., 2011a; 2011b; Muhič et al., 2012] where we explored representations of documents which were valid over multiple languages.  ... 
doi:10.24963/ijcai.2017/720 dblp:conf/ijcai/RupnikMLFG17 fatcat:dp45cm42nras7d355olm7weoja

News Across Languages-Cross-Lingual Document Similarity and Event Tracking

Jan Rupnik, Andrej Muhič, Gregor Leban, Primož Primožškraba, Blaž Fortuna, Marko Grobelnik
2016 Journal of Artificial Intelligence Research   unpublished
The first ingredient of our approach to link clusters across languages represents a continuation of previous work (Rupnik, Muhic, & Skraba, 2011a , 2011b; Muhič, Rupnik, & Škraba, 2012) where we explored  ... 
fatcat:46asv5feirf5tl3eh57taf2lcq

Jihad.cz: Interpreting Jihad, Sexual Jihad and Demographic Jihad in the Czech Anti-Islamic Milieu

Tadeáš Vala
2021 Religions  
Prime Minister Andrej Babiš also used this theme against the opposition at the beginning of 2021 when he was asked what would happen if his ruling ANO party did not win the next elections to the Chamber  ...  will no longer vote for the SPD because he does not want the party to be associated "with that terrorist Balda" and instead is voting and will continue to vote for the party of current Prime Minister Andrej  ... 
doi:10.3390/rel12121086 fatcat:jt7cq47b35gejpf3zyhlsxy2q4

Cross-Lingual Cross-Media Content Linking: Annotations and Joint Representations (Dagstuhl Seminar 15201)

Alexander G. Hauptmann, James Hodson, Juanzi Li, Nicu Sebe, Achim Rettinger, Marc Herbstritt
2015 Dagstuhl Reports  
, Andrej; Leban, Gregor; Skraba, Primoz; Fortuna, Blaz; Grobelnik, Marko; URL http://xling.ijs.si/ License Estevam R.  ...  Smeaton, Alan; Sebe, Nicu; Chong-Wah, Ngo; Thalhammer Andreas; Rettinger Achim Blaz Fortuna (Ghent University, BE) Creative Commons BY 3.0 Unported license © Blaz Fortuna Joint work of Rupnik, Jan; Muhic  ... 
doi:10.4230/dagrep.5.5.43 dblp:journals/dagstuhl-reports/HauptmannHLSR15 fatcat:sjqptft2m5cufcpzslggt7la5i

Laser grooving of surface cracks on hot work tool steel

D. Klobčar, M. Muhič, J. Možina, J. Tušek
2011 Metalurgija  
Andrej Horvat, Dr. Ale{ Gorki~and Prof. Dr. Ladislav Kosec for the help at this research. Note: The responsible translator for English language is Ur{ka Letonja, Moar. Prevajanje, Slovenia  ... 
doaj:3b16b58251764f6ba91a87931b8aa2ef fatcat:3adn32upjfhwrkyw7ewmhbr3t4

The Sixth Visual Object Tracking VOT2018 Challenge Results [chapter]

Matej Kristan, Aleš Leonardis, Jiří Matas, Michael Felsberg, Roman Pflugfelder, Luka Čehovin Zajc, Tomáš Vojír̃, Goutam Bhat, Alan Lukežič, Abdelrahman Eldesokey, Gustavo Fernández, Álvaro García-Martín (+143 others)
2019 Lecture Notes in Computer Science  
The Visual Object Tracking challenge VOT2018 is the sixth annual tracker benchmarking activity organized by the VOT initiative. Results of over eighty trackers are presented; many are state-of-the-art trackers published at major computer vision conferences or in journals in the recent years. The evaluation included the standard VOT and other popular methodologies for short-term tracking analysis and a "real-time" experiment simulating a situation where a tracker processes images as if provided
more » ... y a continuously running sensor. A long-term tracking subchallenge has been introduced to the set of standard VOT sub-challenges. The new subchallenge focuses on long-term tracking properties, namely coping with target disappearance and reappearance. A new dataset has been compiled and a performance evaluation methodology that focuses on long-term tracking capabilities has been adopted. The VOT toolkit has been updated to support both standard short-term and the new longterm tracking subchallenges. Performance of the tested trackers typically by far exceeds standard baselines. The source code for most of the trackers is publicly available from the VOT page. The dataset, the evaluation kit and the results are publicly available at the challenge website 60 . 60 http://votchallenge.net 61
doi:10.1007/978-3-030-11009-3_1 fatcat:wbfi2kp3rze33cl2o56eauhooq

Postopek modeliranja v okviru množičnega vrednotenja nepremičnin (= Modeling procedure within the mass valuation of real estate in Slovenia)

Melita Ulbl, Andrej Glavica
2022 Geodetski vestnik  
Glede na Ulbl in Muhič (2021) je za potrebe srednje vrednosti cen in ostanka takšnega modela najbolj smiselna uporaba geometrijske sredine, vendar sistem množičnega vrednotenja omogoča izbiro različnih  ...  Melita Ulbl, Andrej Glavica POSTOPEK MODELIRANJA V OKVIRU MNOŽIČNEGA VREDNOTENJA NEPREMIČNIN MODELLING PROCEDURE IN THE MASS VALUATION OF REAL ESTATE IN SLOVENIA The mass valuation of real estate in  ... 
doi:10.15292/geodetski-vestnik.2022.02.258-279 doaj:f7547e80a144496a91a6bf525361c19c fatcat:wfbkkmr6bbalvhyeqc6av2clca
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