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Voyager's Natural Language Processing Extension

Natural Language Processing (NLP) is a way of using computer systems to try and interpret text information in the same way that a person would. At its core, NLP tries to understand human language naturally without needing exhaustive sets of processing rules, and can yield much richer results than a simple keyword search.

How NLP Searches Text

In a basic implementation, NLP uses content, context and syntax to identify text strings that fall into what are called Default Named Entities. The categories Voyager uses are listed below, as well as the corresponding field names.  Note that the special field nlp_place is the only field used for geotagging, while all fields can be used in refining search results.

Category Name

Field Name

Administrative Places nlp_admin_places
Art nlp_art 
Events  nlp_events 
Facilities nlp_facilities 
Geographic Places nlp_geo_places 
Groups nlp_groups 
Languages nlp_languages 
Legal References nlp_legal 
Companies and Organizations nlp_orgs 
People nlp_people 
Products nlp_products 
NLP Place (used for geotagging) nlp_place 

Viewing NLP Results

After you have enabled NLP and rescanned the  location, you can find NLP-derived fields on the Detail Page of a record, for example:

In Voyager, adding an NLP pipeline step greatly improves accuracy when identifying the most-relevant search results.  You can also use the results of NLP to improve geotagging results. Note that NLP is a language- and text-based process, so there will no benefit with datasets that do not contain text information.

Voyager's standard installation includes the NLP extension, but you will need to download a separate Python library before you can use it with your data. See Downloading and Installing the Natural Language Processing Python File for more information.

See Also

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