Stanford Temporal Tagger:
SUTime
PA164 – M ACHINE LEARNING AND NATURAL
LANGUAGE
Jakub Holotík
Brno, 2012
Temporal Tagging
● Temporal expressions:
– Time: December 19, 2012; now; the twenties
– Duration: several days, 6 to 8 years
– Interval: Monday to Friday
– Combination thereof: an hour on Wednesday
● Problems encountered
– Tagging of explicit temporal expressions
– Event ordering
– Ambiguity resolution (last Monday, spring)
● TimeML
– <TIMEX3>
SUTime tagging process
● Regular expressions over tokens:
– Tokenization
– Regular expression mapping
– Simple temporal objects
● Composition
– Complex temporal objects
– Removing nested temporal expressions
● Finale
– Ambiguity resolution
– TIMEX3 annotation
– Output
Conclusion
● SUTime limits – Language specific problems:
– Ambiguity resolution (fall - fall)
– Named entity resolution (Halloween)
– Temporal range recognition
● Other systems
– GUTime
– HeidelTime
– TRIPS/TRIOS
● http://nlp.stanford.edu/software/sutime.shtm
Thank You
and
good luck during the exam