publications

2011

  • Constantin Rothkopf, Christos Dimitrakakis
    • Preference elicitation and inverse reinforcement learning
    • ECML 2011 (to appear)
  • Christos Dimitrakakis, 2011 (v1 in 2010).
  • Christos Dimitrakakis, Samy Bengio
    • Phoneme and sentence-level ensembles for speech recognition
    • EURASIP Journal on Audio, Speech and Music Processing

2010

  • Christos Dimitrakakis, Aikaterini Mitrokotsa and Serge Vaudenay
    • Expected loss analysis of thresholded authentication protocols in noisy conditions
    • arXiv 1009.0278 [Abstract] [PDF]
  • Pedro Peris-Lopez, Julio C. Hernandez-Castro, Christos Dimitrakakis, Aikaterini Mitrokotsa and Juan M. E. Tapiador
    • Shedding light on RFID distance bounding protocols and terrorist fraud attacks
    • arXiv 0906.4618 [Abstract] [PDF]
  • Christos Dimitrakakis, 2010
    • Context model inference for large or partially observable MDPs
    • ICML Workshop on reinforcement learning and search in very large spaces. [PDF] [Extended PDF]
  • Christos Dimitrakakis, 2010
    • Bayesian variable order Markov models.
    • In Proceedings of the 13th International Conference on Artificial Intelligence and Statistics (AISTATS), volume 9 of JMLR: W.CP, Chia Laguna Resort, Sardinia, Italy, 2010. [PDF] [Abstract][BibTeX]
    • See also technical report: TR-UVA-09-04.

2009

  • Christos Dimitrakakis, 2009. Efficient Methods for Near-Optimal Sequential Decision Making Under Uncertainty. In Robert Babuska and Frans Groen, editors, Interactive Collaborative Information Systems, SCI 81, pages 125-153, Springer, 2010. [Draft PDF]. The final publication is available at www.springerlink.com.
  • A. Mitrokotsa, C. Dimitrakakis, P. Peris-Lopez, J. C. Hernandez-Castro, 2009
    • Reid et al.'s Distance Bounding Protocol and Mafia Fraud Attacks over Noisy Channels
    • IEEE Communication Letters 14(2):121-123, 2010. [PDF] [Abstract]
  • Christos Dimitrakakis, 2009
    • Complexity of stochastic branch and bound methods for belief tree search in Bayesian reinforcement learning.
    • International conference on Agents and Artificial intelligence (ICAART 2010), pages 259-254.
    • [PDF] [Abstract] [PDF (short version)]
  • Christos Dimitrakakis and Aikaterini Mitrokotsa, 2009
    • Statistical decision making for authentication and intrusion detection
    • Proceedings of the 8th international conference on machine learning and applications (ICMLA 2009), pp. 409-414. [PDF]. [Abstract].

2008

  • Christos Dimitrakakis and Michail Lagoudakis, 2008
  • Christos Dimitrakakis, 2008 (invited)
    • Exploration in POMDPs [PDF]
    • Österreichische Gesellschaft für Artificial Intelligence Journal 1: 24--31, 2008
  • Christos Dimitrakakis 2008
    • Tree Exploration for Bayes RL Exploration
    • International Conference on Computational Intelligence for Modelling, Control and Automation, CIMCA08, Vienna, Austria. [arXiv]
  • Christos Dimitrakakis and Michail Lagoudakis, 2008
    • Rollout Sampling Approximate Policy Iteration
    • ECML 2008 (Abstract only: Full article selected for publication in the Machine Learning journal)
  • Christos Dimitrakakis and Michail Lagoudakis, 2008
    • Algorithms and Bounds for Sampling-based Approximate Policy Iteration, [Abstract] [PDF] [BibTeX]
    • EWRL'08, Lilles, France

2007

  • Christos Dimitrakakis, Christian Savu-Krohn, 2007
    • Cost-minimising strategies for data labelling: optimal stopping and active learning
    • Foundations of Information and Knowledge Systems, FOIKS 2008, [Abstract] [PDF] [BibTeX]
  • Aikaterini Mitrokotsa, Christos Dimitrakakis, Christos Douligeris, 2007
    • Intrusion Detection using cost-sensitive classification
    • EC2ND'07

2006

  • PhD thesis: Ensembles for Sequence Learning [Gzipped PostScript] [PDF] [BibTex]
    • EPFL, Lausanne, Switzerland, 2006.
  • Christos Dimitrakakis, 2006
    • Nearly optimal exploration-exploitation decision thresholds [PDF]
    • ICANN 2006

2005

  • Christos Dimitrakakis, Samy Bengio, 2005
    • Online Policy Adaptation for Ensemble Classifiers[Gzipped PostScript][PDF]
    • Neurocomputing 64 (2005) 211-221.
    • Note that this is an extended version of the conference paper with the same title.
  • Christos Dimitrakakis, Samy Bengio, 2005
  • Gradient-based Estimates of Return Distributions
    • PASCAL workshop on Principled Methods of Trading Exploration and Exploitation. [PDF]
  • Christos Dimitrakakis, Samy Bengio, 2005
    • Boosting Word Error Rates[PDF]
    • ICASSP 2005

2004

  • Christos Dimitrakakis, Samy Bengio, 2004
    • Online Policy Adaptation for Ensemble Classifiers[Gzipped PostScript][PDF][BibTeX][Abstract]
    • ESANN 2004
  • (Extended article invited for publication in the Neurocomputing journal)
  • Christos Dimitrakakis, Samy Bengio, 2004
    • Boosting HMMs with an application to Speech Recognition[PDF]
    • ICASSP 2004

Research Reports

  • Christos Dimitrakakis 2009
    • Bayesian variable order Markov models: Towards Bayesian predictive state representations[Technical report PDF]
  • Christos Dimitrakakis and Samy Bengio, 2009
    • Phoneme and Sentence-Level Ensembles for Speech Recognition
    • (under review)
  • Christos Dimitrakakis 2009
    • Complexity of stochastic branch and bound methods for belief tree search in Bayesian reinforcement learning.[Technical report PDF]
  • Christos Dimitrakakis, Christian Savu-Krohn, 2007
  • Christos Dimitrakakis, 2005, 2007
    • Online statistical estimation for vehicle control: A tutorial [PDF]
    • (Originally IDIAP-RR 06-13)
  • Christos Dimitrakakis, 2006
    • Nearly optimal exploration-exploitation decision thresholds[PostScript][PDF][BibTeX][Abstract]
    • IDIAP-RR 06-12
  • Christos Dimitrakakis, Samy Bengio, 2005
  • Christos Dimitrakakis, Samy Bengio, 2004
  • Christos Dimitrakakis, Samy Bengio, 2004
  • Christos Dimitrakakis, Samy Bengio, 2003
  • Christos Dimitrakakis, Samy Bengio, 2003
  • Christos Dimitrakakis, Samy Bengio, 2002
    • OnLine Policy Adaptation for Ensemble Algorithms[PostScript]
    • IDIAP RR-02-28
  • Christos Dimitrakakis, 1999
    • Reinforcement Learning with Continuous Action Values [gzipped postscript]

Tutorials

  • Christos Dimitrakakis