Authors: Alan Ritter, Sam Clark
contact: aritter@cs.washington.edu
export TWITTER_NLP=./
cat test.1k.txt | python python/ner/extractEntities2.py
note: this takes a minute or so to read in models from files
To include classification, simply add the --classify switch:
cat test.1k.txt | python python/ner/extractEntities2.py --classify
For higher quality, but slower results, optionally include features based on POS and chunk tags (chunk tags require POS)
cat test.1k.txt | python python/ner/extractEntities2.py --classify --pos
cat test.1k.txt | python python/ner/extractEntities2.py --classify --pos --chunk
Also has the ability to include event tags (requires POS):
cat test.1k.txt | python python/ner/extractEntities2.py --classify --pos --event
The output contains the tokenized and tagged words separated by spaces with tags separated by forward slash '/' Example output:
The/B-movie/DT/B-NP/O Town/I-movie/NNP/I-NP/O might/O/MD/B-VP/O be/O/VB/I-VP/O one/O/CD/B-NP/O of/O/IN/B-PP/O the/O/DT/B-NP/O best/O/JJS/I-NP/O movies/O/NNS/I-NP/O I/O/PRP/B-NP/O have/O/VBP/B-VP/O seen/O/VBN/I-VP/O all/O/DT/B-NP/O year/O/NN/I-NP/O ./O/./O/O So/O/RB/O/O ,/O/,/O/O so/O/RB/B-ADJP/O good/O/JJ/I-ADJP/O ./O/./O/O And/O/CC/O/O don't/O/NN/B-NP/O worry/O/NN/I-NP/O Ben/B-person/NNP/I-NP/O ,/O/,/O/O we/O/PRP/B-NP/O already/O/RB/B-ADVP/O forgave/O/VBP/B-VP/B-EVENT you/O/PRP/B-NP/O for/O/IN/B-PP/O Gigli/B-movie/NNP/B-NP/O ./O/./O/O Really/O/RB/B-INTJ/O ./O/./I-INTJ/O
Looking at just one word:
The/B-movie/DT/B-NP/O
The fields are as follows:
| Word: | The | |
| Entity: | B-movie | Begins a named entity of type "movie" |
| Chunk: | B-NP | Begins a noun phrase |
| Event: | O | Not part of an event phrase |
The BIO encoding is used for encoding phrases (Named Entities, event phrases, and chunks), for example:
The/B-movie Town/I-movie might/O ...
Indicates that the word "The" begins a named entity of type movie, "Town" continues that entity, and "might" is outside of an entity mention. For more details see: http://nltk.org/book/ch07.html
- Linux
- Libraries and executables can be compiled with build.sh
@inproceedings{Ritter11,
author = {Ritter, Alan and Clark, Sam and Mausam and Etzioni, Oren},
title = {Named Entity Recognition in Tweets: An Experimental Study},
booktitle = {EMNLP},
year = {2011}
}
@inproceedings{Ritter12,
author = {Ritter, Alan and Mausam and Etzioni, Oren and Clark, Sam},
title = {Open Domain Event Extraction from Twitter},
booktitle = {KDD},
year = {2012}
}
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