For a complete education and academic background, click here.

Professional experience

    Mar 2016 — Present Postdoctoral Researcher, NLP group, Idiap Research Institute (link)
    Jun 2014 — Dec 2014 Visiting Scholar, DVMM lab, Columbia University (link)
    Feb 2012 — Mar 2016 Research Assistant, NLP group, Idiap Research Institute (link)
    May 2009 — Oct 2011 Software Engineer, i-Sieve Technologies (link)
    Nov 2007 — Nov 2011 Software Engineer, Endysis Group (link)
    Mar 2007 — Jul 2007 Software Developer, Optimor Labs (link)

Talks & Lectures

  • “Multilingual Hierarchical Attention Networks for Document Classification", IJCNLP 2017
    Web Slides
  • “Labeling Text in Several Languages with Multilingual Hierarchical Attention Networks”, Swisstext, 2017
    Web Slides Video
  • “Deep Learning for NLP: Multilingual Word Sequence Modeling”, HLT course at EPFL, 2016
    Web Slides
  • “Human versus Machine Attention in Document Classification: A Dataset with Crowdsourced Annotations”, EMNLP, 2016
    Web Slides
  • “Deep Learning for NLP: Word Representation Learning”, HLT course at EPFL, 2016
    Web Slides
  • “Multilingual Visual Sentiment Concept Matching”, ICMR 2016 (prepared)
    Web Slides


  • MATERIAL - Machine Translation for English Retrieval of Information in Any Language (link)
    Intelligence Advanced Research Projects Activity (IARPA), Dec 2017 — Present
  • SUMMA - Scalable Understanding of Multilingual Media (link)
    European Union, Feb 2016 — Present
  • HYBRID - Hybrid Recommender System for a University Social Network (link)
    TheArk Foundation, Aug 2015 — Jan 2016
  • AROLES - Automatic Recommendation of Lectures and Snipets (link)
    SNSF, Nov 2014
  • inEvent - Accessing Dynamic Networked Multimedia Events (link)
    European Union, Feb 2012 — Oct 2014

Awards & Honors

  • Best paper award "Multilingual Hierarchical Attention Networks for Document Classification"
    Nikolaos Pappas and Andrei Popescu-Belis
    International Joint Conference on Natural Language Processing (IJCNLP), 2017
  • Best multimodal paper award "Multilingual Visual Sentiment Concept Matching"
    Nikolaos Pappas, Mercan Topkara, Miriam Redi, Brendan Jou, Tao Chen, Hongyi Liu, Shih-Fu Chang
    ACM International Conference on Multimedia Retrieval (ICMR), 2016
  • PhD student paper award "Adaptive Sentiment-Aware One-Class Collaborative Filtering"
    Nikolaos Pappas and Andrei Popescu-Belis
    Idiap Research Institute, 2015
  • 1st prize on video lecture annotation and search challenge
    Idiap's Natural Language Processing group
    ACM Multimedia Conference, 2013



  • Expert Systems with Applications
  • IEEE Transactions on Multimedia
  • Information Sciences Journal
  • Neural Networks Journal
  • EMNLP 2017
  • ACL 2017
  • ACMMM 2017, 2018
  • ICMR 2017, 2018
  • COLING 2016
  • LREC 2018