Rafet Sifa

I am a research data scientist and a Ph.D. candidate at Fraunhofer Institute for Intelligent Analysis and Information Systems (IAIS). My Ph.D. supervisor is Prof. Bauckhage. My current research focus is based on statistical data mining in the context of understanding and modeling user behavior in virtual environments and games. Before joining Fraunhofer, I worked as a data scientist in the games industry, where I mainly concentrated on developing large scale machine learning solutions for business intelligence problems. 

Short Biography

Work history

  • Research and Phd Fellow - Fraunhofer IAIS, Germany, Oct. 2013 – Present
  • Junior Data Scientist - Game Analytics, Germany, Dec. 2012 – Sep. 2013
  • Data Mining Tutor - University of Bonn, Germany, Apr. 2012 – Oct. 2012
  • Research Assistant - Fraunhofer IAIS and B-IT, Germany, Aug. 2011 – Mar. 2012
  • Software Engineering Intern - Simsoft Bilgisayar Teknolojileri LTD. STI., Turkey, Jul. 2009 – Oct. 2009

Education

  • Master of Science (M.Sc.), Computer Science - University of Bonn, Germany, October 2010 – December 2012
  • Bachelor of Science (B.Sc.), Computer Engineering - Middle East Technical University, Turkey, September 2005 – July 2010

Research Interests

  • Churn, retention and engagement modeling
  • Behavioral Profiling
  • Recommender systems
  • Representation learning through deep learning and matrix factorization

Selected Publications

  • Sifa, Rafet, Fabian Hadiji, Julian Runge, Anders Drachen, Kristian Kersting, and Christian Bauckhage. "Predicting Purchase Decisions in Mobile Free-to-Play Games." In Proceedings of the Artificial Intelligence and Interactive Digital Entertainment Conference. AAAI, 2015.
  • Sifa, Rafet, César Ojeda, and Christian Bauckhage. "User Churn Migration Analysis with DEDICOM." In Proceedings of the ACM Conference on Recommender Systems. ACM, 2015.
  • Bauckhage, Christian, and Rafet Sifa. "k-Maxoids Clustering." In Proceedings of the Workshop on Knowledge Discovery, Data Mining and Machine Learning. LWA, 2015.
  • Sifa, Rafet, Anders Drachen, and Christian Bauckhage. "Large-Scale Cross-Game Player Behavior Analysis on Steam." In Artificial Intelligence and Interactive Digital Entertainment Conference. AAAI, 2015.
  • Bauckhage, Christian, Anders Drachen, and Rafet Sifa. "Clustering Game Behavior Data." IEEE Transactions on Computational Intelligence and AI in Games 7, no. 3 (2015): 266-278.
  • Hadiji, Fabian, Rafet Sifa, Anders Drachen, Christian Thurau, Kristian Kersting, and Christian Bauckhage. "Predicting Player Churn in the Wild." In Proceedings of the Conference on Computational Intelligence and Games. IEEE, 2014.
  • Bauckhage, Christian, Rafet Sifa, Anders Drachen, Christian Thurau, and Fabian Hadiji. "Beyond Heatmaps: Spatio-temporal Clustering Using Behavior-based Partitioning of Game Levels."  In Proceedings of the Conference on Computational Intelligence and Games. IEEE, 2014.
  • Sifa, Rafet, Christian Bauckhage, and Anders Drachen. "The Playtime Principle: Large-scale Cross-games Interest Modeling."  In Proceedings of the Conference on Computational Intelligence and Games. IEEE, 2014.
  • Sifa, Rafet, Christian Bauckhage, and Anders Drachen. "Archetypal Game Recommender Systems." In Proceedings of the Workshop on Knowledge Discovery, Data Mining and Machine Learning. LWA, 2014.
  • Drachen, Anders, Rafet Sifa, and Christian Thurau. "The Name in the Game: Patterns in Character Names and Gamer Tags." Entertainment Computing 5, no. 1 (2014): 21-32.
  • Sifa, Rafet, Anders Drachen, Christian Bauckhage, Christian Thurau, and Alessandro Canossa. "Behavior Evolution in Tomb Raider Underworld." In Proceedings of the Conference on Computational Intelligence and Games. IEEE, 2013.
  • Drachen, Anders, Christian Thurau, Rafet Sifa, and Christian Bauckhage. "A Comparison of Methods for Player Clustering via Behavioral Telemetry." In Proceedings of the Conference on Foundation of Digital Games. 2013.
  • Sifa, Rafet, and Christian Bauckhage. "Archetypical Motion: Supervised Game Behavior Learning With Archetypal Analysis."  In Proceedings of the Conference on Computational Intelligence and Games. IEEE, 2013.
  • Drachen, Anders, Rafet Sifa, Christian Bauckhage, and Christian Thurau. "Guns, Swords and Data: Clustering of Player Behavior in Computer Games in the Wild." In Proceedings of the Conference on Computational Intelligence and Games. IEEE, 2012.
  • Bauckhage, Christian, Kristian Kersting, Rafet Sifa, Christian Thurau, Anders Drachen, and Alessandro Canossa. "How Players Lose Interest in Playing a Game: An Empirical Study Based on Distributions of Total Playing Times." In Proceedings of the Conference on Computational Intelligence and Games. IEEE, 2012.

Selected Awards

  • Best Paper Award for the paper titled as "Predicting Purchase Decisions in Mobile Free-to-Play Games" in AAAI Conference on Artificial Intelligence and Interactive Digital Entertainment, November 2015
  • Outstanding Thesis Award from Bonn Informatics Society, December 2013
  • Dean's High Honors List from Middle East Technical University, December 2009 and June 2010
  • Dean's Honors List from Middle East Technical University, December 2008 and June 2009