SUTIME: A Library for Recognizing and Normalizing Time Expressions

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Detecting Temporal Expressions

There are 2 steps for extracting time from natural language expressions -

  1. Detecting temporal expressions.
  2. Extracting normalized time expressions from natural language phrases.

This paper is about the latter. They use TIMEX representation of time expression.

Types of Temporal Expressions

There are 4 types of temporal expressions -

  1. Time - A time point indicating a particular instance on a time scale. Examples include Nov 20 1988, 5:30 PM, now, next weekend or Sunday Evening.

  2. Duration - The amount of intervening time between the two end-points of a time interval. Examples include 5 days, 10 months, a decade, few years or 2-3 months.

  3. Interval - A range of time defined by a start and end time points. Examples include Jan 2021 to Feb 2022.

  4. Set - A set of temporals. Examples include “every 3rd Sunday”.

Datasets and Evaluation

Kaushik Rangadurai

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