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I am a 3rd year Doctor of Philosophy in Engineering Science student, working on a joint project between the Department of Engineering Science and the Department of Zoology at the University of Oxford. My research involves the development of methodologies for probabilistic inference in spatio-temporal data and tools that help us identify relations between entities in large datasets that are dominated by noise and/or missing observations. We are also examining how genetic (SNP) data account for network structure in large ecological systems. I work under the supervision of Prof Stephen Roberts (Engineering), Prof Ben Sheldon (Zoology) and Dr Robin Freeman (Microsoft) and I hold a fully funded 3-year Microsoft Research scholarship.
I conducted my Master of Science in Information Technology (with Distinction) at the Department of Computing Science, University of Glasgow, under the supervision of Dr Theodoros Damoulas and Prof Mark Girolami. Our research, conducted in the context of my MSc dissertation at the Inference Research Group and published on the IEEE Transactions on Neural Networks journal, involved the family of sparse Bayesian learning methodologies multi-class multi-kernel Relevance Vector Machines (mRVMs). The research was sponsored by NCR Systems and more details are available here.
I hold a 5-year Engineering Degree from the Department of Production Engineering and Management, Technical University of Crete (Greece). My undergraduate thesis involved the development of macroscopic traffic simulation models and experimentation on a specific urban area of Athens. The research was conducted under the supervision of Dr Elias Kosmatopoulos and was funded by the Greek Secretariat for Research and Technology.
During the summer of 2012, I moved to Washington DC to conduct my sabbatical at DeepMile Networks LLC, working on methodologies to identify influencers in Social Media.
I come from Rethymno, Crete (Greece).
Papers:
Ioannis Psorakis, Stephen Roberts, Iead Rezek and Ben Sheldon " Inferring social network structure in ecological systems from spatio-temporal data streams", Journal of the Royal Society Interface, vol. 9 no. 76, pp 3055-3066, doi:10.1098/rsif.2012.0223. Media coverage: here,here and here. Supplementary material here
Ioannis Psorakis, Stephen Roberts, Mark Ebden, Ben Sheldon " Overlapping Community Detection using Nonnegative Matrix Factorization", Physical Review E 83, 066114 (2011), (a copy here)
Ioannis Psorakis, Theodoros Damoulas, Mark A. Girolami "Multiclass Relevance Vector Machines: Sparsity and Accuracy", IEEE Transactions on Neural Networks, Vol. 21, No 10, pp. 1588-1598, 2010 (a copy here)
Jens Krause, Stephan Krause, Robert Arlinghaus, Ioannis Psorakis, Stephen Roberts and Christian Rutz " Reality Mining in Ecological Systems", review paper for the journal Trends in Ecology and Evolution (to appear)
Edwin Simpson, Stephen Roberts, Ioannis Psorakis, and Arfon Smith " Dynamic Bayesian Combination of Multiple Imperfect Classifiers", Intelligent Systems Reference Library series, Springer (to appear)
Ioannis Psorakis, Iead Rezek, Zach Frankel and Stephen Roberts " Bayesian one-mode projection for dynamic bipartite graphs", (under submission)
Mark Smith, Steven Reece, Stephen Roberts, Ioannis Psorakis and Iead Rezek " Maritime Abnormality using Gaussian Processes", Knowledge and Information Systems, Springer (to appear)
Ioannis Psorakis, Stephen Roberts, Ben Sheldon "Soft Partitioning in Networks via Bayesian Non-negative Matrix Factorization", In 24th Annual Conference on Neural Information Processing Systems (NIPS), Workshop on Networks Across Disciplines: Theory and Applications (2010). (a copy here)
Posters and invited presentations:
Ioannis Psorakis, Iead Rezek, Stephen Roberts and Ben Sheldon, "Inferring social network structure in ecological systems from spatio-temporal data", OCCAM Workshop "Networks in Biology", Department of Mathematics (Oxford), December 2012.
Ioannis Psorakis, Iead Rezek, Stephen Roberts and Ben Sheldon, "Learning Social Structure from Spatio-Temporal Data", Oxford Biodiversity Symposium, September 2012.
Edwin Simpson, Stephen Roberts, Ioannis Psorakis, Arfon Smith, Chris Lintott "Bayesian Combination of Multiple, Imperfect Classifiers", In 25th Annual Conference on Neural Information Processing Systems (NIPS), Workshop on Decision Making with Multiple Imperfect Decision Makers (2011). (poster: here)
Ioannis Psorakis, Mark Ebden, Stephen Roberts, Ben Sheldon, Iead Rezek " Inferring graph structure from spatio-temporal data ", ORCHID all-hands meeting, Winchester (UK), October 2011 (poster: here)
Mark Ebden, Ioannis Psorakis, Stephen Roberts " Community Changepoints in Dynamic Networks ", ORCHID all-hands meeting, Winchester (UK), October 2011 (poster: here)
Mark Ebden, Ioannis Psorakis, Stephen Roberts, Ben Sheldon "Soft Partitioning in Networks via Bayesian Non-negative Matrix Factorization ", 31st International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering, Waterloo (Canada) July 2011
Ioannis Psorakis, Stephen Roberts, Ben Sheldon "Social Network Analysis in the Parus Major population ", Edward Grey Institute conference, Oxford (UK) January 2011
Ioannis Psorakis, Stephen Roberts, Ben Sheldon "Soft Partitioning in Networks via Bayesian Non-negative Matrix Factorization ", Neural Information Processing Systems (NIPS), Vancouver/Whistler (Canada) December 2010 (poster: here)
Ioannis Psorakis, Stephen Roberts, Ben Sheldon "Probabilistic community detection ", Lipari Summer School on Complex networks, Lipari (Italy) July 2010
Ioannis Psorakis, Stephen Roberts, Ben Sheldon "Inferring community structure in wild bird populations ", Microsoft Research summer school, Cambridge (UK) June 2010 (poster: here)
Stephen Roberts, Ioannis Psorakis, Ben Sheldon "Computationally efficient Bayesian community detection ", Oxford-Harvard workshop on networks, Oxford (UK) May 2010
Technical reports:
Ioannis Psorakis "Probabilistc inference of dynamic networks from spatio-temporal data" PARG report 2012.
Ioannis Psorakis, Stephen Roberts, Ben Sheldon "Efficient Bayesian Community Detection using Nonnegative Matrix Factorisation", arXiv:1009.2646v5 [stat:ML] (a copy here)
Ioannis Psorakis, "Bayesian Community Detection: an application to a dynamic wild bird network", Department of Engineering Science PRS transfer report, University of Oxford December 2010 (a copy here)
Ioannis Psorakis, Stephen Roberts, Ben Sheldon "Community Detection Algorithms: a comparative evaluation on artifical and real-world datasets", Department of Engineering Science technical report, University of Oxford March 2010 (a copy here)
Theses:
Ioannis Psorakis, DPhil (PhD) thesis "Probabilistic inference in ecological networks; graph discovery, community detection and modelling dynamic sociality", Department of Engineering Science, University of Oxford UK
Ioannis Psorakis, MSc thesis "Implementing multiclass Relevance Vector Machines and investigating sparsity and accuracy", Department of Computing Science, University of Glasgow UK
Ioannis Psorakis, BEng thesis "Software development for traffic modelling and evaluation of urban networks", Department of Production Engineering and Management, Technical University of Crete GR
Reviewer for journals:
The Computer Journal, Oxford Journals.
IEEE/ACM Transactions on Networking, IEEE / ACM/ SIGCOMM.
Physics Letters A, Elsevier.
Software:
The MATLAB codes for our mRVM paper are located here .
The MATLAB codes for our NMF community detection paper are located here.
The MATLAB codes for our Data stream-to-Graph (GMMevents) inference paper are located here.
Other:
Different spellings of my name: Ioannis Psorakis, Ιωάννης Ψωράκης, Yannis Psorakis, Giannis Psorakis, Γιάννης Ψωράκης. They are all correct but only the first two (english and greek version respectively) are formal passport-wise!
I am a member of Wolfson College and the Oxford Union . My Academia.edu profile page is here , and my LinkedIn page here . I enjoy running and playing the guitar.
go
90s
style!
Random internet silliness:
