GERBIL: General Entity Annotation Benchmark Framework

GERBIL is a general entity annotation system based on the BAT-Framework.

Source Code Demo Issues Wiki

Overview of GERBIL
The need to bridge between the unstructured data on the document Web and the structured data on the Data Web has led to the development of a considerable number of annotation tools. Those tools are hard to compare since published results are calculated on diverse datasets and measured in different units. A first approach to structure the parameter- and tool-space of semantic entity annotation systems was published by Cornolti et al.. However, the BAT-framework is hard to setup and does not allow for an easy comparison of tools and datasets.

We present GERBIL, a general entity annotation system based on the BAT-Framework. GERBIL offers an easy-to-use web-based platform for the agile comparison of annotators using multiple datasets and uniform measuring approaches. To add a tool to GERBIL, all the end user has to do is to provide a URL to a REST interface to its tool which abides by a given specification. The integration and benchmarking of the tool against user-specified datasets is then carried out automatically by the GERBIL platform. Currently, our platform provides results for 9 annotators and 11 datasets with more coming. Internally, GERBIL is based on the Natural Language Programming Interchange Format (NIF) and provide Java classes for implementing APIs for datasets and annotators to NIF.

The following table lists the annotators supported in different version of the BAT-Framework and GERBIL.

Annotators BAT-Framework Gerbil 1.0.0 Gerbil 1.2.2
Wikipedia Miner
Illionois Wikifier
TagMe 2
NIF-based Annotator
AIDA (✔)
FREME e-Entity

The following table lists the annotators that are currently available and the experiment types they support. Note that some of the A2KB annotators support the D2KB experiment by offering an own API method. Other A2KB annotators can be chosen for a D2KB experiment as well as described in the wiki. However, since the comparison might not be fair, we marked these annotators with (✔) in the table. The same is done for Entity Typing.

Entity Recognition
D2KB Entity
OKE Task 1 OKE Task 2
AIDA (✔)
Dexter (✔) (✔)
FRED (✔) (✔)
FREME e-Entity
FOX (✔) (✔)
TagMe 2 (✔)
xLisa (✔)

The following table lists the datasets that are currently available and the experiment types they support.

Entity Recognition
Entity Typing OKE Task 1 OKE Task 2
Microposts 2014-Test
Microposts 2014-Train
OKE 2015 Task 1 evaluation dataset
OKE 2015 Task 1 example set
OKE 2015 Task 1 gold standard sample
OKE 2015 Task 2 evaluation dataset
OKE 2015 Task 2 example set
OKE 2015 Task 2 gold standard sample

Long term stability

The idea of GERBIL emerged in September 2014 when a couple of articles released at the same time claimed to be state-of-the-art. Especially, those approaches were not easily comparable due to their heterogeneous set-up, dataset use and evaluation metrics. Thus, we decided to build GERBIL and extend the BAT-Framework to break the barriers for people not able to write source code. GERBIL is still a young project and thus we are trying to explore the borders of our endeavour. As GERBIL has been launched within two PhD projects funded by European Social Fund we are confident that it will be a long lasting web service. The fallback is our working group AKSW which currently already hosts more than 30 open source projects. Finally, GERBIL is open source software which can be maintained and hosted by anybody.

Furthermore, the research and developement unit of the University Leipzig Computation Center keeps daily backups to ensure long-term quotability.

With this project we aim at establishing a highly available, easy quotable and liable focal point for NER and NED evaluations. Additionally, we build our framework to be rapidly extensible and adaptable for future uses.

The survey data from our paper can be found at GERBIL's GitHub repository.


  • Ciro Baron (University Leipzig, Germany)
  • Andreas Both (R&D, Unister GmbH, Germany)
  • Martin Brümmer (University Leipzig, Germany)
  • Diego Ceccarelli (Unversity Pisa, Italy)
  • Marco Cornolti (University of Pisa, Italy)
  • Didier Cherix (R&D, Unister GmbH, Germany)
  • Bernd Eickmann (R&D, Unister GmbH, Germany)
  • Paolo Ferragina (University of Pisa, Italy)
  • Christiane Lemke (R&D, Unister GmbH, Germany)
  • Andrea Moro (Sapienza University of Rome, Italy)
  • Roberto Navigli (Sapienza University of Rome, Italy)
  • Francesco Piccinno (University of Pisa, Italy)
  • Giuseppe Rizzo (EURECOM, France)
  • Harald Sack (HPI Potsdam, Germany)
  • René Speck (Institute for Applied Informatics, Germany)
  • Raphaël Troncy (EURECOM, France)
  • Jörg Waitelonis (HPI Potsdam, Germany)
  • Lars Wesemann (R&D, Unister GmbH, Germany)

Project Team


by (Editors: ) [BibTex of ]


AKSW Colloquium, 15th August, 3pm, RDF query relaxation ( 2016-08-10T11:03:58+02:00 Michael Roeder)

2016-08-10T11:03:58+02:00 Michael Roeder

On the 15th of August at 3 PM, Michael Röder will present the paper “RDF Query Relaxation Strategies Based on Failure Causes” of Fokou et al. in P702. Read more about "AKSW Colloquium, 15th August, 3pm, RDF query relaxation"

Article accepted in Journal of Web Semantics ( 2016-08-02T09:54:24+02:00 by Lorenz Bühmann)

2016-08-02T09:54:24+02:00 by Lorenz Bühmann

We are happy to announce that the article “DL-Learner – A Framework for Inductive Learning on the Semantic Web” by Lorenz Bühmann, Jens Lehmann and Patrick Westphal was accepted for publication in the Journal of Web Semantics: Science, Services and Agents on … Continue reading → Read more about "Article accepted in Journal of Web Semantics"

AKSW Colloquium, 18.07.2016, AEGLE and node2vec ( 2016-07-18T14:56:44+02:00 TommasoSoru)

2016-07-18T14:56:44+02:00 TommasoSoru

On Monday 18.07.2016, Kleanthi Georgala will give her Colloquium presentation for her paper “An Efficient Approach for the Generation of Allen Relations”, that was accepted at the European Conference on Artificial Intelligence (ECAI) 2016. Read more about "AKSW Colloquium, 18.07.2016, AEGLE and node2vec"

AKSW Colloquium, 04.07.2016. Big Data, Code Quality. ( 2016-06-29T12:34:35+02:00 by Ivan Ermilov)

2016-06-29T12:34:35+02:00 by Ivan Ermilov

On the upcoming Monday (04.07.2016), AKSW group will discuss topics related to Semantic Web and Big Data as well as programming languages and code quality. Read more about "AKSW Colloquium, 04.07.2016. Big Data, Code Quality."

Accepted Papers of AKSW Members @ Semantics 2016 ( 2016-06-27T12:50:01+02:00 by Sandra Bartsch)

2016-06-27T12:50:01+02:00 by Sandra Bartsch

This year’s SEMANTiCS conference which is taking place between September 12 – 15, 2016 in Leipzig recently invited for the submission of research papers on semantic technologies. Read more about "Accepted Papers of AKSW Members @ Semantics 2016"