HAWK (original from 2015, ESWC paper)
Hybrid Question Answering (hawk) -- is going to drive forth the OKBQA vision of hybrid question answering using Linked Data and full-text indizes.
Performance benchmarks can be done on the QALD-5 hybrid benchmark (test+train)
For more useful tools and more current Question Answering related topic please see https://github.com/dice-group/NLIWOD/
Building HAWK
Tested under Java 1.8.
git clone https://github.com/dice-group/hawk.git
mvn clean package -DskipTests
java -jar target/hawk-0.2.1.jar
or run via Eclipse IDE.
After cloning make sure the class src/main/java/org/aksw/hawk/querybuilding/SPARQL.java points to a valid endpoint (FUSEKI + full-text-feature-activated): http://131.234.28.52:3030/ (unreliable)
Restful Service
curl localhost:8181/search?q=What+is+the+capital+of+Germany+%3F
will return a UUID.
curl http://localhost:8181/status?UUID=00000000-0000-0000-0000-000000000001
gives you status updates
Setting up your own Fuseki Endpoint
Please read https://medium.com/@rrichajalota234/how-to-apache-jena-fuseki-3-x-x-1304dd810f09
A ready-to-go index can be found here: https://hobbitdata.informatik.uni-leipzig.de/hawk/
If you encounter performance issues, go to the scripts of Jena Fuseki and increase the amount of available RAM (e.g., -Xmx6G).
Citation
@inproceedings{DBLP:conf/esws/UsbeckNBU15,
author = {Ricardo Usbeck and
Axel{-}Cyrille Ngonga Ngomo and
Lorenz B{\"{u}}hmann and
Christina Unger},
title = {{HAWK} - Hybrid Question Answering Using Linked Data},
booktitle = {The Semantic Web. Latest Advances and New Domains - 12th European
Semantic Web Conference, {ESWC} 2015, Portoroz, Slovenia, May 31 -
June 4, 2015. Proceedings},
pages = {353--368},
year = {2015},
crossref = {DBLP:conf/esws/2015},
url = {https://doi.org/10.1007/978-3-319-18818-8_22},
doi = {10.1007/978-3-319-18818-8_22},
timestamp = {Fri, 02 Jun 2017 20:49:47 +0200},
biburl = {http://dblp.org/rec/bib/conf/esws/UsbeckNBU15},
bibsource = {dblp computer science bibliography, http://dblp.org}
}