6 Sep 2019

Together with Polina Rozenshtein we are presenting a tutorial in EDBT Summer School 2019 on "Mining temporal networks".

3 Sep 2019

I am attending the Data Science Summer School 2019 in Pisa, and presenting a tutorial on "Polarization on social media".

1 Sep 2019

Together with Ira Assent, Carlotta Domeniconi, and Eyke Hüllermeier we are serving as guest editors of the ECML PKDD 2020 journal track. Accepted papers will appear in the Machine Learning on Data Mining and Knowledge Discovery journals, and they will also be presented in the ECML PKDD 2020 conference. You may consider submitting.

4 Aug 2019

Together with Polina Rozenshtein we are presenting a tutorial in KDD 2019 on "Mining temporal networks".

14 Jun 2019

Together with the Aalto Data Science BSc students we are visiting EURECOM for a Data Science bootcamp (group photo).

12 Jun 2019

The project "Machine learning meets Database Systems (MLDB)," received funding from the Academy of Finland. The consortium consists of the Data Mining group in Aalto, and the research group of prof. Michael Mathioudakis in the University of Helsinki.

14 May 2019

I am attending the Web Conference 2019 in San Francisco.

25 Mar 2019

My project application "An algorithmic framework for reducing bias and polarization in online media (REBOUND)" was awarded an ERC Advanced Grant.

26 Feb 2019

I am visiting ISI Foundation, in Torino. A photo working with Francesco and Babis.

12 Dec 2018

Attending SoBigData project meeting in King's College, London (photo from the project meeting).

11 Dec 2018

I presented a keynote in the Complex Networks 2018 conference, in Cambridge, UK.

10 Dec 2018

I gave a talk in Nokia Bell Labs, Cambridge, UK, on "Active network alignment".

29 Nov 2018

I gave a keynote presentation in International Workshop on Decision Making and Recommender Systems 2018 on "Diversity maximization in social networks".

10 Nov 2018

Polina Rozenshtein defended successfully her PhD dissertation with opponent Professor Leman Akoglu. Congratulations Polina! (photo from the defense.)

11 Oct 2018

In UPF, chairing the PhD defense committee of Ioanna Tsalouchidou, supervised by Ricardo Baeza Yates and Francesco Bonchi (photo from the defense).

5 Oct 2018

Happy and honored to be nominated an ISI Foundation fellow.

13 Sep 2018

I gave a keynote presentation in ECML PKDD 2018 on "Combating bias and polarization in online media". (slides)

6 Sep 2018

Five papers of our group have been accepted at the IEEE International Conference on Data Mining (ICDM) 2018:
"Tell me something my friends do not know: Diversity maximization in social networks", by Antonis Matakos and Aristides Gionis,
"Robust cascade reconstruction by Steiner-tree sampling", by Han Xiao, Cigdem Aslay, and Aristides Gionis,
"Finding events in temporal networks: Segmentation meets densest-subgraph discovery", by Polina Rozenshtein, Francesco Bonchi, Aristides Gionis, Mauro Sozio, and Nikolaj Tatti,
"Explainable time series tweaking via irreversible and reversible temporal transformations", by Isak Karlsson, Jonathan Rebane, Panagiotis Papapetrou, and Aristides Gionis, and
"Maximizing the diversity of exposure in a social network", by Cigdem Aslay, Antonis Matakos, Esther Galbrun, and Aristides Gionis.

20 Jun 2018

Eric Malmi defended successfully his PhD dissertation with opponent Professor David Gleich. Congratulations Eric! (photo from the defense).

30 Mar 2018

I gave a presentation in the 9th Italian Information Retrieval Workshop on Combating polarization in social media.

9 May 2018

Our work on filter bubbles in Nyt (in Finnish).

27 Apr 2018

I am a member of the committee for the PhD defense of Matteo Lissandrini in the University of Trento (photo after the defense).

24 Apr 2018

Giving a presentation on Mining temporal networks in the First International Workshop on Online Social Networks and Media: Network Properties and Dynamics (OSNED), collocated with the Web Conference 2018 in Lyon.

12 Mar 2018

Giving a presentation on Computational problems in mining urban data in the Machine Learning and Data Analytics Symposium (MLDAS) 2018 in Doha.

9 Feb 2018

PhD defense of Sanja Scepanovic, with opponent Professor Fosca Giannotti (photo from the defense).

7 Feb 2018

PhD defense of Kiran Garimella, with opponent Professor Dino Pedreschi (photo before the defense).

21 Dec 2017

The project "Adaptive and intelligent data", received funding from the Academy of Finland. The consortium consists of the Data Mining group in Aalto, and the Collaborative Networking group, led by professor Jussi Kangasharju in the University of Helsinki.

19 Dec 2017

I attended the Aalto stochastic sauna 2017 and gave a presentation on Mining temporal networks.

9 Dec 2017

I attended the NIPS workshop on prioritising online content and gave two presentations on Reducing controversy by connecting opposing views and Political echo chambers in social media.

23 Nov 2017

I am giving a presentation in Ghent University on "Active network alignment".

20 Nov 2017

I am visiting the Interesting patterns group of Tijl De Bie in Ghent University.

23 Oct 2017

I gave a presentation in the HIIT machine learning coffee seminar on "computational challenges in analyzing and moderating online social discussions".

18 Oct 2017

I attended the Helsinki digital humanities summit 2017 and gave a short presentation on "historic data analysis and online social debates".

12 Oct 2017

The project "Active knowledge discovery in graphs" received funding from the Academy of Finland.

16 Dec 2016

In UPF, chairing the PhD defense committee of Cigdem Aslay.

12 Dec 2016

Hosting the PhD Forum in ICDM 2016. Great invited talks by Alexandra Olteanu, Tina Eliassi-Rad, Nikolaj Tatti, and presentations by all the PhD students.

18 Nov 2016

I gave a talk in the "Tor Vergata" University of Rome on "Dense subgraph discovery".

14 Nov 2016

I gave a talk in the "Sapienza" University of Rome on Mining temporal networks.

17 Oct 2016

During October and November 2016 I am visiting Sapienza, University of Rome.

5 Oct 2016

Attending the workshop What's new in networks? -- Building bridges between computational, mathematical and statistical network analysis, organized by the LMU Center for Advanced Studies (CAS).

21 Aug 2016

Giving a short course on "Basic principles of algorithmic graph mining" in the 15th Estonian Summer School on Computer and System Science.

10 Jun 2016

Together with Sanjay Chawla we are organizing the ICDM PhD Forum 2016 in Barcelona.

22 Apr 2016

Visiting UPF in Barcelona to participate in the committee of the PhD defense of Yasir Mehmood (who joined LUMS as an assistant professor).

17 Dec 2015

I will give a short course on "Algorithmic methods for mining large graphs" in the Bertinoro International Spring School 2016.

11 Dec 2015

Attending the WWW PC meeting in Oxford. Dinner at Oriel College.

22 Sep 2015

Attending the kick off meeting of the SoBigData project, in Scuola Normale Superiore, in Pisa (photo 1, photo 2).

16 Sep 2015

In École Polytechnique, in the PhD committee of Fragkiskos Malliaros.

14 Sep 2015

List of topics proposed for the T-61.5910 research project course.

4 Sep 2015

Presented the dense subgraph discovery tutorial in the ECML PKDD 2015 summer school.

1 Sep 2015

Slides of my talk in SPIRE 2015 on computational problems in mining urban data.

20 Aug 2015

Material for the tutorial on dense subgraph discovery, which I presented with Babis Tsourakakis in KDD 2015.

22 Jun 2015

Open positions in the Data Mining group.

17 Jun 2015

The project Network structure from group response (Nestor) received funding from the Academy of Finland.

10 May 2015

Are you working on algorithms for evolving networks? Consider submitting a paper on the upcoming special issue of Internet Mathematics.

30 Apr 2015

With Babis Tsourakakis we will present a tutorial in KDD 2015 on "Dense subgraph discovery".

23 Mar 2015

I will attend the Summer School on Operational Research and Applications in Nizhny Novgorod, Russia, lecturing on graph mining.

12 Jan 2015

Attending the first summer workshop of the center for semantic web research in Santiago, Chile.

22 Oct 2014

Started serving in the editorial board of the ACM Transactions on Knowledge Discovery from Data (TKDD).

20 Oct 2014

Visited Telecom Innovation Labs and gave a talk in TU Berlin with title "Discovering events and communities in activity networks".

7, 8 Oct 2014

In the IT University of Copenhagen. Opponent in the PhD defense of Ninh Dang Pham and giving a talk in the kick-off event for Rasmus Pagh's ERC grant.

19 Sep 2014

The slide deck from the Aalto Digi breakfast on data science.

15 Aug 2014

The data mining group is starting the Northern bytes blog.

26 Jun 2014

The slides from my tutorial on "dense-subgraph discovery" in the summer school of Network analysis and applications are available.

19 Jun 2014

Recipients of the 2014 Yahoo Faculty Research and Engagement Program (FREP) award.

21 Apr 2014

New "Analytics and Data Science" module/minor in Aalto.

17 Apr 2014

Our paper "Structured prediction of network response", with Hongyu Su and Juho Rousu, will appear in ICML 2014.
Problem studied: given an individual performing an action in a social network, who else will perform the same action in the network?

20 Mar 2014

Toon Calders and Panagiotis Papapetrou are visiting Aalto.

14 Mar 2014

Kaggle competition for our "matrix approximations" course.

25 Jan 2014

I am an invited lecturer in the summer school of Network analysis and applications in Lunchon, France, June 21--July 5.

10 Jan 2014

This semester I am teaching a seminar on "Matrix approximations" with Nikolaj Tatti.

4 Dec 2013

In the committe of the PhD defense of Hoang Thanh Lam in TU/e.

27 Nov 2013

Launching Helsinki algorithms seminar on Fridays.

22 Nov 2013

The program of the ICDM 2013 PhD forum is available. We are delighted to have Jilles Vreeken as an invited speaker.

28 Oct 2013

T-61.5060 Algorithmic Methods of Data Mining course is starting this week.

25 Oct 2013

I will be attending and speaking in the launching symposium of the Data Science Center Eindhoven (DSC/e).

23 Aug 2013

Michael Mathioudakis joined the data mining group.

20 Aug 2013

With Alessandro Panconesi I am co-chairing the "social networks and graph analysis" track of the WWW 2014 conference. Deadline on Oct 10, just 7 weeks away.

12 Aug 2013

The slides from the KDD 2013 tutorial on "modeling and mining large graphs" are available.

1 Jul 2013

Aparna Varde and I are organizing the ICDM 2013 PhD student forum.

30 Jun 2013

ECML PKDD 2013 accepted papers. Strong presence from Helsinki with eleven papers.

5 May 2013

Charles Elkan and I are chairing the best-paper award committee of KDD 2013.

30 Apr 2013

Gianmarco De Francisci Morales, Fabrizio Silvestri and I are organizing SNOW 2013, which will take place in Rio de Janeiro in conjunction with WWW 2013.

27 Mar 2013

Alan Frieze, Babis Tsourakakis and I will give a tutorial in KDD 2013 and ECML PKDD 2013 on "Algorithmic techniques for modeling and mining large graphs".

6 Mar 2013

I gave my inauguration talk in the Aalto series of tenured professors' installation lectures. The title of the talk was "data analysis for smart living".

Feb 2013

Nikolaj Tatti joined the data mining group.

Jan 2013

During spring 2013 I am giving a seminar with Juho Rousu on "learning and mining with graphs".