Funding from the Academy of Finland

P.S, tomorrow i will be talking at the MIAO seminar about abstract cores. The talk will be recorded and put up on youtube later.

Today I received the very pleasant news of having been granted funding for my project “Next-generation Trustworthy Constraint Optimisation” from the Academy of Finland,
My proposal was one of the 44 post-doctoral projects that were granted funding (11% of all applications). My term as an Academy postdoctoral researcher will start this fall and continue until 2024. The full list of funded proposals can be found here.

I would like to express my sincerest gratitude toward the Academy. I am looking forward to the opportunity of realizing my (very cool) research plan!

The spring of presentations continues

A week ago I gave the second talk at the Simons Institute, this time at the Theoretical Foundations of SAT/SMT Solving seminar. The event webpage can be found here. I had the opportunity to talk about my work on preprocessing for Maximum Satisfiability, covering work done both during and after the preprocessing.

I would again like to thank Marjin Heule for considering me as a speaker for the event. Next time you can hear me speak is at Jakob Nordströms video seminars on the 4.6. I will talk about Abstract Cores in the IHS algorithm for MaxSAT, covering my recent paper from SAT 2020. Looking forward to seeing you there!

Invited Talks at the Simons Institute

This spring I have been very fortunate to have been invited to give to talks at the various different seminars run by the Simons Institute in California.

The first talk on solving MaxSAT was given on the 13th of April together with Matti Järvisalo. The talk was a part of the Beyond Satisfiability seminar, a recording of it can be found here.

The second talk will be on MaxSAT preprocessing on May 5th as a part of the Theoretical Foundation of SAT/SMT solving workshop. More information can be found here. As the talk is online. I invite anyone who is interested to attend. I am sure the talks will be interesting, personally I am looking forward to hearing about SAT and QBF preprocessing form Benjamin and Martina.

I would like to thank the organisers of the various seminars of the Simons Institute for considering me as a speaker in their events.

Member of Young Academy Finland

In the spring I was invited to join the Young Academy Finland (nuorten tiedeakatemia).
My 4-year membership started this fall.
The Academy is “a multidisciplinary organization for young researchers that aims to promote research and strengthen the status of science and scholarship in society“.
I am exited for this opportunity and hope to be able to form meaningful contacts and have a positive impact on the state of research and especially research communication in Finland during my four year mandate.  

My Thesis won an Award

I am happy to let you know that my Thesis: Solving Optimization Problems via Maximum Satisfiability: Encodings and Re-Encodings was awarded the international ACP Doctoral Thesis Award by the Association of Constraint Programming. I will be receiving the award and giving a presentation on my thesis on the 11.9 at the CP 2020 conference. The conference is virtual and free to attend, I hope to see you all there.

Im an honoured for receiving the price and want to thank the ACP for the recognition.
My presentation can be found at: at google drive.

A news article with more info can be found at:

MaxSAT tutorial at ECAI 2020

Tomorrow (4.9.2020 at 14:00 Helsinki Timezone) I will be giving a tutorial on MaxSAT at the ECAI 2020 conference together with Matti Järvisalo and Ruben Martins. The event is virtual and attendance is free, so any interested people should attend.

I am looking forward to the (new) experience of giving a tutorial, I am happy with the material and am sure we will be able to tech people about modern MaxSAT in an affective way.

Best Paper award at SAT 2020


I am happy to let you know that my paper titled Abstract Cores in Implicit Hitting set MaxSat solving has been awarded a best paper award at the 2020 SAT conference. The paper reports on work that was started during my visit to Toronto in 2019. We propose a technique that seeks to address the inherent drawback in the so called implicit hitting set approach to MaxSAT solving, one of the most successful approaches to solving MaxSAT instances corresponding to real world applications. Abstract cores seek to reduce the number of cores that the algorithm needs to extract before terminating without increasing the complexity of the core extraction steps too much. The instantiation of this idea in the MaxHS solver was one of the best performing approaches in the 2020 MaxSAT Evaluation.

I would like to thank the conference organizers for the recognition and for putting together an event that, considering the current circumstances, was probably the best possible way of organizing SAT 2020. I would also like to thank my co-authors, especially Prof. Fahiem Bacchus for his efforts in the implementation and getting the experimental results.

Supervising Master’s Theses

This spring was the first time I co-supervised Master’s theses. In total three students got their theses accepted during June:

I’d like to congratulate all students on finishing their theses. Even if I had supervised Bachelor’s theses before, supervising Master’s level students was a new experience for me. I learned a lot and can only hope I could provide useful supervision for them as well.

New paper accepted

I am happy to inform you that my paper “Abstract Cores in Implicit Hitting Set MaxSat Solving” has been accepted to the SAT 2020 conference.

The paper proposes an improvement to the so called Implicit Hitting Set-based approach to exact MaxSAT solving. The paper summarises the work we did with professor Fahiem Bacchus and MSc, Alex Poole during my visit to Toronto last year. I am exited by the paper. Thanks to both of my co-authors!

I will add the paper to these pages once the camera ready version has been submitted.


New papers accepted

The new decade has started well for me with two accepted publications already.
The first one, Preprocessing in Incomplete MaxSAT Solving is joint work with Marcus Leivo and Matti järvisalo, and is also Marcus first publication! The paper investigates the effect that preprocessing has on the non-optimal solutions of MAxSAT instances. The paper ties  my recent work on incomplete MaxSAT solving with my earlier work on MaxSAT preprocessing and I am very excited to push this line of research further. It will be published in the proceedings of the 2020 ECAI conference. I will most likely be travelling there myself to present this work, we are also looking into proposing a tutorial for the conference.

The second paper, Core-Guided and Core-Boosted Search for CP, extends and generalises my work on incomplete MaxSAT solving to the more general finite domain constraint programming paradigm. The paper is joint work with Graeme Grange, Emir Demirovic and Peter Stuckey from Australia. I am surprised and pleased to see that our previous work on MaxSAT seems to work so well in CP solving as well. The paper will be published in the proceedings of the 2020 CPAIOR conference. I will most likely not travel there myself, but I am sure that my co-authors will do the paper justice.

I’d like to thank all my co-authors for their work, it’s been a pleasure collaborating and hopefully we can continue doing so. The papers will be added to this webpage when the publishing process is done. If you want to read them earlier, feel free to send me an e-mail.