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O seu registo foi criado com exito. But first a small introduction, Information Extraction, in an NLP context, deals with the problem of extracting structured information from text. For a computer text is just a sequence of bytes, with no semantic meaning whatsoever. A possible approach to extract structured information from text is to extract semantic relationships or semantic triples, for instance, named-entities e. Typically or until most systems aimed at extracting relationships with known a priori relationship types i.
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OIE techniques, on the other hand, extract all possible relationship types from a given collections of documents. OIE can be divided into two main categories, data- and rule-based. Rule-based OIE relies on hand-crafted patterns from PoS-tagged text or rules operating on dependency parse trees. Data-based OIE generates patterns based on training data represented by means of dependency tree or PoS-tagged text. The figure below shows a taxonomy of different methods to perform relationship extraction. If you are interested you can also check Chapter 2 of my PhD thesis for a review of work in relationship extraction.
ReVerb Fader et al. If there are multiple possible matches for a single verb, the longest possible match is chosen. If the pattern matches multiple adjacent sequences, ReVerb merges them into a single relation phrase. During extraction, the system first looks for a matching relational phrase and then for the arguments e1, e2 of the relationship, thus avoiding confusing a noun in the relational phrase for an argument. For English, there are several software packages ready to use out-of-the-box to perform simple NLP tasks: such as part-of-speech tagging, dependency parsing, named-entity recognition, etc.
I also did a small change from the original ReVerb algorithm, instead of looking for noun-phrases, I first tagged all the named-entities i. I had some troubles installing PyICU which is needed for Polyglot, this post on stackoverflow helped me. Polyglot tries do automatically detect the language in which a text is written and apply the correct model i.
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But, due to foreign names, sometimes it detects the language as being English or other rather than Portuguese, but you can force the language of a text and override the language detection mechanism. You just need to give an email address to receive the credentials allowing to download the collection.
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The figure below is a statistical description of the dataset. I used Polyglot to identify named-entities and perform part-of-speech tagging, then I looked for ReVerb patterns between every pair of named-entities which was no more than 8 tokens apart. This took around 2 hours to run on a Mac Book Pro, and extracted around 70 unique relational triples.