Extraction of temporal expressions from sms messages

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Information about Extraction of temporal expressions from sms messages
Technology

Published on February 14, 2014

Author: karawash

Source: slideshare.net

Description

How to extract a temporal expression from a text?

by Ahmad Karawash EXTRACTION OF TEMPORAL EXPRESSIONS FROM SMS MESSAGES 1

Overview      Introduction SMS Corpus Extraction of Temporal Expressions Evaluation Conclusion

Introduction - SMS Corpus - Extraction of Temporal Expressions – Evaluation - Conclusion Paper’s Idea This work discusses a way for extracting temporal expressions in SMS messages in order to automatically fill in an electronic calendar

Introduction - SMS Corpus - Extraction of Temporal Expressions – Evaluation - Conclusion How it works?  After sending a message, event is extracted and putted automatically in the calendar

Introduction - SMS Corpus - Extraction of Temporal Expressions – Evaluation - Conclusion What was the problem ?  Hard to extract an event from unstructured text, need to build an application to identify temporal information related to meetings or events in SMS messages.

Introduction - SMS Corpus - Extraction of Temporal Expressions – Evaluation - Conclusion Corpus used?  Corpus of thousands of SMS messages is used, gathered following the strict sms4science collection methodology. Sms4science is an international project that promotes the study of a corpus of text messages: users are asked to send a copy of text messages that they have already sent to a real address

Introduction - SMS Corpus - Extraction of Temporal Expressions – Evaluation - Conclusion SMS script  To build a suitable Grammar, SMS scripts that contain standard French Language and social language (ex: we are going to the school today) are used.

Introduction - SMS Corpus - Extraction of Temporal Expressions – Evaluation - Conclusion Extraction temporal expressions  since SMS expression is temporal, information retrieval and extraction are used to offer an automatic process of temporal information.

Introduction - SMS Corpus - Extraction of Temporal Expressions – Evaluation - Conclusion Temporal expressions to be extracted can be: • a time: “at 6:00”; • a date: “the 3rd of January” • a relative moment (day, part of day): “today”; “now”;“Monday”; “next Sunday”; “tonight”; • implicit expression: “see you on Monday”; “see you tomorrow”.

Introduction - SMS Corpus - Extraction of Temporal Expressions – Evaluation - Conclusion Variable expressions problem  For example (tomorrow) is usually invariable but can take many forms in SMS: tomoro, 2moro, 2mro, . . .  In order to solve this problem researches built a specialized lexicon in which each variation (2moro) is linked to a standard lemma (tomorrow).

Introduction - SMS Corpus - Extraction of Temporal Expressions – Evaluation - Conclusion evaluation:  The method is applied on hundreds of SMS messages  Recall < 0.7  Precision > 0.7

Introduction - SMS Corpus - Extraction of Temporal Expressions – Evaluation – Conclusion conclusion  Results can easily be improved by working on the first two sources of errors (by extending grammar)  As a future work, the text extraction methods can be applied to chatting tools, email, Facebook, Twitter

advantages  It is a good way to facilitate a communication between people  These types of researches gives a new way of automatic manage of event based on expression extraction

disadvantages  cost of phone increase since we need a better memory and CPU to detect extraction  The time between sending and receiving SMS depends on the machine resource facilities

Critics  Expression extraction is still not covered by all languages (case study was only on English language)  Extraction of events from a big message need more effort by system  Because of ambiguity of words, a wrong event is recorded in the calendar  Whats about using images or shapes to tell about event?

opinion  Instead of developing a complex script to cover all used expression while the goal is to set an event in the receiver calendar, why we don’t give the SMS sender an option to edit the calendar of the receiver?

by Ahmad Karawash PhD - Computer science, Canada Email: ahmad.karawash@gmail.com

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