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Getting started

monalehtinen edited this page Aug 23, 2019 · 19 revisions

Install Annif

First you need to install Annif. Clone this repository and follow the instructions in the top level README file.

Define projects and backends

Projects and their backends are defined in the projects.cfg file. By default Annif looks for this file in the current directory where it is executed, but the path can be overridden by setting the ANNIF_PROJECTS environment variable. The template file projects.cfg.dist already contains some projects, you can just copy it to projects.cfg to get started.

It's easiest to start with one of the predefined TF-IDF projects. If you use these, you will not need to touch the configuration files. Further down we will assume that you are using the tfidf-en project.

Prepare and load a subject vocabulary

Annif stores vocabularies, models and other data files under a directory. This defaults to data under the current directory, but the path can be overridden by setting the ANNIF_DATADIR environment variable.

Most Annif backends require a subject vocabulary and some training data.

To get started, you can clone the Annif-corpora repository which contains subject vocabularies and training documents in three languages created from metadata.

Of course you can also create your own vocabulary. The format is explained on the page Subject vocabulary formats.

You now have to load the vocabulary that the project will use:

annif loadvoc tfidf-en /path/to/Annif-corpora/vocab/yso-en.tsv

This will take a few seconds.

Then you need some training data. We will train the model using the the English language training data generated from metadata:

annif train tfidf-en /path/to/Annif-corpora/training/yso-finna-en.tsv.gz

This will take a few minutes. Now your Annif is ready for action!

Test with an example document

You can test by piping a UTF-8-encoded text file into Annif like this:

cat document.txt | annif suggest tfidf-en

(NB. The command was called analyze before Annif 0.40)

After a while you should get a tab-separated list of subjects. This is a very inefficient way of using Annif since the model has to be loaded each time, which takes tens of seconds, but good for initial testing that everything works.

Evaluate with a directory full of files

If you have several documents with gold standard subjects, you can evaluate how well Annif works using the evaldir command. First you need to place the documents as text files in a directory and store the subjects in TSV files with the same basename. See Corpus formats for more information about the format. Then you can evaluate:

annif eval tfidf-en /path/to/documents/

This will again take a while to start but then evaluation should not take a long time per document. In the end you will get a number of statistical measures, similar to this:

Precision (doc avg):    0.1714285714285714
Recall (doc avg):       0.36649659863945583
F1 score (doc avg):     0.2318510737628385
Precision (conc avg):   0.001245541364630077
Recall (conc avg):      0.0011485235510088807
F1 score (conc avg):    0.001146177490671795
Precision (microavg):   0.17142857142857143
Recall (microavg):      0.36363636363636365
F1 score (microavg):    0.23300970873786409
NDCG:                   0.36769238316041325
NDCG@5:                 0.3426718725322724
NDCG@10:                0.36769238316041325
Precision@1:            0.42857142857142855
Precision@3:            0.3571428571428571
Precision@5:            0.2857142857142857
LRAP:                   0.2467723479191469
True positives:         48
False positives:        232
False negatives:        84
Documents evaluated:    28 

Start up the application

You can run Annif as a web application that provides a REST API and a web UI for testing. This is much more efficient than using it from the command line since the heavy models are loaded just once. You can start Annif with:

annif run

This will run a test server on http://localhost:5000/

The REST API is at http://localhost:5000/v1/

The Swagger UI documentation for the REST API is at http://localhost:5000/v1/ui/

Next steps

Once you have one project/backend working you can start adding more projects and trying out more backends. See Project configuration for more information.

For production use you should try Running as a WSGI service.

Troubleshooting, questions and discussion

Check out the Annif-users -mailing list/forum and feel free to join the discussion or ask questions!

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