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OPAL Topic Extraction (D3.4)
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OPAL component to extract entities such as places, keywords from dataset descriptions to improve relevant dataset seraching. This repository contains all data and utilities to train and test a topic extraction model.


python version 3.x, rasa_nlu

Usage Instructions

1. Generation of training and testing data (rasa_nlu format).

The component assumes the training and testing data (annotated manually or automatically) is contained in .txt file where each training example is a single line consisting of annotated text. In topic extraction, we focus on 5 entity types, namely: place, person, date and keyword. An example annotation is as shown below

This is a Housing Benefit dataset for all new claims and change of circumstances received by the <entity type=place uri=null>London</entity> Borough of Barnet in the second half of <entity type=date uri=null>2015</entity>.

To generate training and testing data, run the following command by adjusting paths to input training and testing (.txt) files and output files accordingly.


Once the command is finished, the files are generated at the desired output location.

2. Train the topic extraction model.

Once the training file is generated from the above step, create a model by adjusting the paths to map to the training and configuration file and running the command


The above command generates a persistent model which could be found under the base directory of the project. Note that, one can create several models which could be found in the model folder's default directory.

3: Test the generated model.

Once a model is generated, it can be tested using the test data. To test the model, run the following command

python -m rasa_nlu.evaluate \
    --data path/to/test.json \
    --model path/to/model/default/model_20180323-145833

Note that, in the above command, model specifies the model to evaluate on the test data specified with data.


Data Science Group (DICE) at Paderborn University

This work has been supported by the German Federal Ministry of Transport and Digital Infrastructure (BMVI) in the project Open Data Portal Germany (OPAL) (funding code 19F2028A).

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