KNN-based Topic Detection

• Build training index with pre-labeled topic
  • 45000 Broadcast News stories from 1995 and 1996
  • 3178 different news topics occurring > 10 times
• Search for top 10 related stories in training index
• Lookup topics for related stories
• Re-weight topics by story relevance (select top 5)
• At 5 topics, Recall - .491 Relevance - .482

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