Aapo Hyvärinen
Professor
Contact Information
Aapo.Hyvarinen[at]cs.helsinki.fi
A330
(09) 19151415
Principal Investigator of
Examiner for exams
Teaching
2014 spring
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Lecturer , in charge
2013 spring
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In charge
2013 spring
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Lecturer , in charge
2012 spring
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Lecturer , in charge
2012 spring
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In charge
2011 spring
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Lecturer , in charge
2011 spring
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In charge
2010 spring
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Lecturer , in charge
2010 spring
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In charge
2009 spring
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Lecturer , in charge
2008 autumn
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In charge
2008 spring
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Lecturer , in charge
2007 spring
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Lecturer , in charge
2006 spring
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Lecturer , in charge
2005 spring
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Lecturer , in charge
2004 summer
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Lecturer
2004 spring
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Lecturer , in charge
Publications
Publications gathered from the TUHAT database profile.
2012
Characterization of neuromagnetic brain rhythms over time scales of minutes using spatial independent component analysis
Ramkumar, P. , Parkkonen, L. , Hari, R. & Hyvärinen, A. 2012 In : Human Brain Mapping. 33, 7, p. 1648-1662. 15 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Estimation of causal orders in a linear non-gaussian acyclic model: a method robust against latent confounders
Tashiro, T. , Shimizu, S. , Hyvärinen, A. & Washio, T. 2012 p. 491-498. 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Learning a selectivity-invariance-selectivity feature extraction architecture for images
Gutmann, M. U. & Hyvärinen, A. 2012Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Noise-Contrastive Estimation of Unnormalized Statistical Models, with Applications to Natural Image Statistics
Gutmann, M. U. & Hyvärinen, A. 2012 In : Journal of Machine Learning Research. 13, p. 307-361. 55 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Structural equations and divisive normalization for energy-dependent component analysis
Hirayama, J. & Hyvärinen, A. 2012 9 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Topographic Analysis of Correlated Components
Sasaki, H. , Gutmann, M. U. , Shouno, H. & Hyvärinen, A. 2012 In : JMRL : Workshop and Conference Proceedings. 25, 14 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
2011
A general linear non-Gaussian state-space model: Identifiability, identification, and application
Zhang, K. & Hyvärinen, A. 2011 In : JMRL : Workshop and Conference Proceedings. 20, p. 113–128. 16 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Complex-valued independent component analysis of natural images
Laparra, V. , Gutmann, M. U. , Malo, J. & Hyvärinen, A. 2011 p. 213-220. 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
DirectLiNGAM: A direct method for learning a linear non-Gaussian structural equation model
Shimizu, S. , Inazumi, T. , Sogawa, Y. , Hyvärinen, A. , Kawahara, Y. , Washio, T. , Hoyer, P. & Bollen, K. 2011 In : Journal of Machine Learning Research. 12, 24 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Estimating Exogenous Variables in Data with More Variables than Observations
Sogawa, Y. , Shimizu, S. , Hyvärinen, A. , Washio, T. , Shimamura, T. & Imoto, S. 2011 In : Neural Networks. 24, 8, p. 875-880.Publication: Contribution to journal ⺠A1 Refereed journal article
Extracting coactivated features from multiple datasets
Gutmann, M. U. & Hyvärinen, A. 2011 p. 323-330. 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Hermite Polynomials and Measures of Non-Gaussianity
Puuronen, J. S. & Hyvärinen, A. 2011 p. 205--212.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Learning Topographic Representations for Linearly Correlated Components
Sasaki, H. , Gutmann, M. U. , Shouno, H. & Hyvärinen, A. 2011 9 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Testing the ICA mixing matrix based on inter-subject or inter-session consistency
Hyvärinen, A. 2011 In : NeuroImage. 58, 1, p. 122-136.Publication: Contribution to journal ⺠A1 Refereed journal article
2010
A Family of Computationally Efficient and Simple Estimators for Unnormalized Statistical Models
Pihlaja, M. , Gutmann, M. U. & Hyvärinen, A. J. 2010 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
A Two-Layer Model of Natural Stimuli Estimated with Score Matching
Köster, U. & Hyvärinen, A. 2010 In : Neural Computation. 22, 9, p. 2308-2333. 26 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Characterization of spontaneous neuromagnetic brain rhythms using independent component analysis of short-time Fourier transforms
Ramkumar, P. , Hyvärinen, A. , Parkkonen, L. & Hari, R. 2010Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Discovery of exogenous variables in data with more variables than observations
Sogawa, Y. , Shimizu, S. , Hyvärinen, A. , Washio, T. , Shimamura, T. & Imoto, S. 2010 p. 67-76.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Distinguishing causes from effects using nonlinear acyclic causal models
Zhang , K. & Hyvärinen, A. 2010 p. 157–164 .Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Estimation of a Structural Vector Autoregression Model Using Non-Gaussianity
Hyvärinen, A. , Zhang , K. , Shimizu , S. & Hoyer, P. O. 2010 In : Journal of Machine Learning Research. 11 , p. 1709–1731 . 23 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Independent component analysis of short-time Fourier transforms for spontaneous EEG/MEG analysis
Hyvärinen , A. , Ramkumar, P. , Parkkonen, L. & Hari, R. 2010 In : NeuroImage. 49, 1, p. 257-271. 15 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Iterative algorithms
Zarzoso , V. & Hyvärinen, A. J. 2010 In: Handbook on Independent Component Analysis and Blind Source Separation . Academic PressPublication: Contribution to book/anthology ⺠A3 Contribution to book/other compilations (refereed)
Noise-contrastive estimation: A new estimation principle for unnormalized statistical models
Gutmann, U. M. & Hyvärinen, A. 2010 p. 297-304. 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Pairwise measures of causal direction in linear non-gaussian acyclic models
Hyvärinen, A. 2010 p. 1-16. 16 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Source separation and higher-order causal analysis of MEG and EEG
Zhang, K. & Hyvärinen, A. 2010 p. 709-716. 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Sparse and low-rank estimation of time-varying markov networks with alternating direction method of multipliers
Hirayama, J. , Hyvärinen, A. & Ishii, S. 2010 p. 371-379. 9 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Statistical models of natural images and cortical visual representation
Hyvärinen, A. 2010 In : Topics in Cognitive Science. 2 , 2, p. 251-264. 14 p.Publication: Contribution to journal ⺠A2 Review in scientific journal
WordICA-emergence of linguistic representations for words by independent component analysis
Honkela, T. , Hyvärinen, A. & Väyrynen, J. J. 2010 In : Natural Language Engineering. 16, 3, p. 277-308. 32 p.Publication: Contribution to journal ⺠A1 Refereed journal article
2009
A direct method for estimating a causal ordering in a linear non-gaussian acyclic model
Shimizu, S. , Hyvärinen, A. , Kawahara, Y. & Washio, T. 2009Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Causality discovery with additive disturbances: An informationtheoretical perspective
Zhang , K. & Hyvärinen, A. 2009 p. 570–585 .Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Estimating Markov random field potentials for natural images
Köster, U. , Lindgren, J. T. & Hyvärinen, A. 2009 p. 515-522. 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Estimation of linear non-Gaussian acyclic models for latent factors
Shimizu, S. , Hoyer, P. O. & Hyvärinen, A. 2009 In : Neurocomputing. 72, 7-9, p. 2024-2027. 4 p.Publication: Contribution to journal ⺠A1 Refereed journal article
ICA with sparse connections: Revisited
Zhang , K. , Peng, H. , Chan, L. & Hyvärinen, A. J. 2009 p. 195–202 .Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Learning features by contrasting natural images with noise
Gutmann, M. U. & Hyvärinen, A. 2009 p. 623-632. 10 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Learning natural image structure with a horizontal product model
Köster, U. , Lindgren, J. T. , Gutmann, M. & Hyvärinen, A. 2009 p. 507-514. 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Learning reconstruction and prediction of natural stimuli by a population of spiking neurons
Gutmann, M. U. , Hyvärinen, A. & Aihara , K. 2009Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Learning spike-timings based representations of sensory stimuli with leaky integrate-and-fire neurons
Gutmann, M. U. & Hyvärinen, A. 2009 In : BMC Neuroscience. 10, Suppl. 1, p. P144. 2 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Modelling image complexity by independent component analysis, with application to content-based image retrieval
Perkiö, J. & Hyvärinen, A. 2009 p. 704-714. 11 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Natural image statistics: a probabilistic approach to early computational vision
Hyvärinen, A. , Hurri, J. & Hoyer, P. O. 2009 New York: Springer.Publication: Book/anthology ⺠C1 Published scientific monograph
Natural image statistics: energy-based models estimated by score matching
Köster, U. & Hyvärinen, A. 2009 p. 16-25. 10 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
On the identifiability of the post-nonlinear causal model
Zhang , K. & Hyvärinen, A. 2009 9 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Representation of cross-frequency spatial phase relationships in human visual cortex
Henriksson, L. , Hyvärinen, A. & Vanni, S. 2009 In : Journal of Neuroscience. 29, 45, p. 14342-14351. 10 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Unsupervised learning by discriminating data from artificial noise
Gutmann, M. U. & Hyvärinen, A. 2009Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Visual features underlying perceived brightness as revealed by classification images
Kurki, I. , Peromaa, T. , Hyvärinen, A. & Saarinen, J. 2009 In : PLoS One. 4, 10, p. e7432. 8 p.Publication: Contribution to journal ⺠A1 Refereed journal article
2008
Causal discovery of linear acyclic models with arbitrary distributions
Hoyer, P. O. , Hyvärinen, A. , Scheines, R. , Spirtes, P. , Ramsey, J. , Lacerda, G. & Shimizu, S. 2008 p. 282–289 .Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Causal modelling combining instantaneous and lagged effects: an identifiable model based on non-Gaussianity
Hyvärinen, A. , Shimizu, S. & Hoyer, P. O. 2008 p. 424–431 .Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Discovery of linear non-gaussian acyclic models in the presence of latent classes
Shimizu, S. & Hyvärinen, A. 2008 p. 752-761. 10 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Estimation theory and information geometry based on denoising
Hyvärinen, A. 2008Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Learning encoding and decoding filters for data representation with a spiking neuron
Gutmann, M. , Hyvärinen, A. J. & Aihara , K. 2008Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
On the learning of nonlinear visual features from natural images by optimizing response energies
Lindgren, J. T. & Hyvärinen, A. 2008 p. 1026-1033. 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Optimal approximation of signal priors
Hyvärinen, A. 2008 In : Neural Computation. 20, 12, p. 3087-3110. 24 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Spatial dependencies between local luminance and contrast in natural images
Lindgren, J. T. , Hurri, J. & Hyvärinen, A. 2008 In : Journal of vision. 8, 12, p. 1-13. 13 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Spatial frequency tuning in human retinotopic visual areas
Henriksson, L. , Nurminen, L. , Hyvärinen, A. & Vanni, S. 2008 In : Journal of vision. 8, 10, p. 1-13. 13 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Unsupervised learning of dependencies between local luminance and contrast in natural images
Lindgren, J. T. , Hurri, J. & Hyvärinen, A. 2008 p. 356-362. 7 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
2007
A two-layer ICA-like model estimated by score matching
Köster, U. & Hyvärinen, A. 2007 p. 798-807. 10 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Behavioural priors: learning to search efficiently in action planning
Hyvärinen, A. 2007 p. 324-328. 5 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Complex cell pooling and the statistics of natural images
Hyvärinen, A. & Köster, U. 2007 In : Network: Computation in Neural Systems . 18, 2, p. 81 - 100. 20 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Connections between score matching, contrastive divergence, and pseudolikelihood for continuous-valued variables
Hyvärinen, A. 2007 In : IEEE Transactions on Neural Networks. 18, 5, p. 1529-1531. 3 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Emergence of conjunctive visual features by quadratic independent component analysis
Lindgren, J. T. & Hyvärinen, A. 2007 p. 897-904. 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Equivalence of some common linear feature extraction techniques for appearance-based object recognition tasks
Asuncion Vicente, M. , Hoyer, P. O. & Hyvärinen, A. 2007 In : IEEE Transactions on Pattern Analysis and Machine Intelligence. 29, 5, p. 896-900. 5 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Some extensions of score matching
Hyvärinen, A. 2007 In : Computational Statistics & Data Analysis. 51, 5, p. 2499-2512. 14 p.Publication: Contribution to journal ⺠A1 Refereed journal article
The statistical properties of local log-contrast in natural images
Lindgren, J. T. , Hurri, J. & Hyvärinen, A. 2007 p. 354-363. 10 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Unsupervised learning of an embodied representation for action selection
Hyvärinen, A. 2007 p. 658-665. 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
2006
A linear non-gaussian acyclic model for causal discovery
Shimizu, S. , Hoyer, P. O. , Hyvärinen, A. & Kerminen, A. 2006 In : Journal of Machine Learning Research. 7, p. 2003-2030. 28 p.Publication: Contribution to journal ⺠A1 Refereed journal article
A quasi-stochastic gradient algorithm for variance-dependent component analysis
Hyvärinen, A. & Shimizu , S. 2006 p. 211–220 .Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Collinear context (and learning) change the profile of the perceptual filter
Kurki, I. , Hyvärinen, A. & Laurinen, P. 2006 In : Vision Research. 46, p. 2009-2014. 6 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Consistency of pseudolikelihood estimation of fully visible Boltzmann machines
Hyvärinen, A. 2006 In : Neural Computation. 18, p. 2283-2292. 10 p.Publication: Contribution to journal ⺠A1 Refereed journal article
FastISA: A fast fixed-point algorithm for independent subspace analysis
Hyvärinen, A. J. & Köster , U. 2006Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Finding a causal ordering via independent component analysis
Shimizu, S. , Hyvärinen, A. , Hoyer, P. O. & Kano, Y. 2006 In : Computational Statistics & Data Analysis. 50, p. 3278-3293. 16 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Learning to segment any random vector
Hyvärinen, A. J. & Perkiö, J. P. 2006 p. 4167–4172 .Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
New permutation algorithms for causal discovery using ICA
Hoyer, P. O. , Shimizu, S. , Hyvärinen, A. , Kerminen, A. & Kano, Y. 2006 p. 115-122. 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Testing significance of mixing and demixing coefficients in ICA
Shimizu, S. , Hyvärinen, A. , Hoyer, P. O. , Kerminen, A. & Kano, Y. 2006 p. 901-908. 8 p.Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
2005
A generalized least squares approach to blind separation of sources which have variance dependencies
Shimizu, S. , Hyvärinen, A. J. & Kano, Y. 2005Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
A unifying model for blind separation of independent sources
Hyvärinen, A. 2005 In : Signal Processing. 85, p. 1419-1427. 9 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Discovery of non-gaussian linear causal models using ICA
Shimizu, S. , Hyvärinen, A. J. , Kano, Y. & Hoyer, P. O. 2005 p. 526–533 .Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Emergence of linguistic features: Independent component analysis of contexts
Honkela, T. , Hyvärinen, A. J. & Väyrynen , J. 2005Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Estimation of non-normalized statistical models by score matching
Hyvarinen, A. 2005 In : Journal of Machine Learning Research. 6, p. 695-709. 15 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Independent component analysis of fMRI group studies by self-organizing clustering
Esposito, F. , Scarabino, T. , Hyvärinen, A. , Himberg, J. , Formisano, E. , Comani, S. , Tedeschi, G. , Goebel, R. , Seifritz, E. & Di Salle, F. 2005 In : NeuroImage. 25, p. 193-205. 13 p.Publication: Contribution to journal ⺠A1 Refereed journal article
Statistical model of natural stimuli predicts edge-like pooling of spatial frequency channels in V2
Hyvärinen, A. , Gutmann, M. U. & Hoyer, P. O. 2005 In : BMC Neuroscience. 6, p. -.Publication: Contribution to journal ⺠A1 Refereed journal article
Statistical models of images and early vision
Hyvärinen, A. J. , Hoyer, P. O. , Hurri, J. & Gutmann, M. U. 2005 p. 1–14 .Publication: Conference contribution ⺠A4 Article in conference publication (refereed)
Address: Department of Computer Science, P.O. 68 (Gustaf Hällströmin katu 2b), FI-00014 UNIVERSITY OF HELSINKI, FINLAND
Opening Hours: During spring and autumn semesters Mon - Fri 7.45 - 19.45 (7.45 am - 7.45 pm)
Phone: +358 9 1911 (University switch)
General e-mail: info [at] cs.helsinki.fi
Fax: +358 9 1915 1120
