Topic Detection and Tracking
Event – An event is something that happens at some specific time and place, and the unavoidable consequences. Specific elections, accidents, crimes and natural disasters are examples of events.
Activity – An activity is a connected set of actions that have a common focus or purpose. Specific campaigns, investigations, and disaster relief efforts are examples of activities.
Story – A story is a newswire article or a segment of a news broadcast with a coherent news focus. They must...
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