Johann Petrak

I am a researcher at the Austrian Research Institute for Artificial Intelligence and also a research fellow at the University of Sheffield and a member of the Natural Language Processing Group of the Computer Science Department. Enthusiastic developer of open source software.

I am currently working in a project that analyses the behaviour of visitors of a large Austrian news site and how the discourse in the online discussion forums influences the interaction with the site. I am also working on approaches for estimating semantic similarity between texts, machine learning approaches to tagging of text and large-scale multilingual entity recognition and disambiguation.
I am part of the core development team that develops the GATE NLP framework and have developed and contributed to a number of GATE plugins and other GATE related software as well as a number of other open-source projects.

I am interested in a wide range of research topics, including machine learning approaches for text tagging, learning to rank and metric learning, approaches to natural language processing based on imitation learning and cost-sensitive learning and the synergies between knowledge representation and ontologies on one hand and natural language processing on the other hand.

Contact

Publications

See also Google Scholar

Selected publications:

Selected Projects

A list of selected projects I participated in:

Software

I am an enthusiastic developer and supporter of open source software and have contributed to the development of the GATE NLP framework, the Python GateNLP NLP framework, many GATE NLP plugins, the FARM deep learning framwork, and a number of other projects.

codesrank.io

Johann's GitHub stats

Some selected software projects: