ExFaKT

This program takes as input candidate facts, Knowledge Graph (KG), set of Horn rules and Text corpus and finds the set of evidences supporting or refuting the candidate facts.

This is source code for
ExFaKT: A framework for explaining facts over knowledge graphs and text,
Mohamed Gad-Elrab, Daria Stepanova, Jacopo Urbani, Gerhard Weikum
In 12th International Conference on Web Search and Data Mining, 87-95, ACM 2019.

Installation

Dependencies

This project depends on 2 other projects:

• FactChecking: The code is included
• IRIS-Reasoner: we use libs files built from https://github.com/NICTA/iris-reasoner

To load the libraries into mvn repositry:

sh install_external_jars.sh

Packaging

Then to generarte scripts and the jar package execute these commands in the project root directory:

mvn clean
mvn package -Dmaven.test.skip=true
mvn install -Dmaven.test.skip=true

Configuration

There are 2 main configiration files

• Rewriting Configuration: QueryRewriting/src/main/resources/fact_checking_rewriting.properties
• Fact Spotting Configuration: FactChecking/src/main/resources/factchecking.properties

Sample of the configurations can be find in '/src/main/resources/sample_conf' folders. Most of the paramters can be overritten by the CLI arguments.

Run as webservice (for the demo)

Start the Web Service

1. clone with git clone --recurse-submodules https://github.molgen.mpg.de/gadelrab/ExFaK

2. Download Elasticsearch 5.3 https://www.elastic.co/downloads/past-releases/elasticsearch-5-3-1

3. Download Elasticsearch indexed data and extract them:http://resources.mpi-inf.mpg.de/d5/exfakt/esData.tar.gz
   this includes Yago related index and Wikipedia_sentences

4. change "path.data:" in the folder elasticsearch-5.3.1/config/elasticsearch.yml to the extracted esData folder path.data:<path>/esData

5. start Elasticsearch ./<elasticsearch_path>/bin/elasticsearch

6. Then you can directly run the webservice using sh ./scripts/run_webservice2.sh elasticsearch_host eleasticsearch_port

Note: the script assumes that Elasticsearch is running on a different machine and initiate a ssh tunnel, you can skip it if both are on the same machine.

Java Client

You can use the java client to call explanation API.

https://github.molgen.mpg.de/gadelrab/ExFaKT/blob/master/Client/src/main/java/client/explain/ExplanationExtractorClient.java

Run CLI

The main running scripts are generated into queryrewriting/assembler/bin folder.

Checking facts

To spot facts with the rewriting process, we run:

sh QueryRewriting/assemble/bin/check_facts.sh

Arguments

usage: check_facts.sh [options]
 -cf,--ckeckFact                                Check correctness of a fact
 -conf,--configurationFile <file>               Input configuration file
 -eval,--EvaluationMethod <method>              Evaluation Method
 -f,--factsFiles <file>                         Facts File
 -h,--help                                      Show Help
 -o,--outputFile <file>                         Output File
 -q,--queryFiles <file>                         Query File in IRIS format
 -r,--rulesFiles <file>                         Rules File
 -spotConf,--spottingConfigurationFile <file>   Spotting configuration file

Evaluate fact checking rankings

sh QueryRewriting/assemble/bin/eval_labels.sh <column with ranking score> <column with labels> <input file>