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Evaluation on Tweets <br />
• Dataset:Tweets2011 <br />
– Sample 50 hashtag with clear topic <br />
– Extract tweets with these hashtags <br />
• Evaluation Metric: H score <br />
– IntraDis: average distance between docs under the same hashtag <br />
– InterDis: average distance between docs under different hashtags <br />
– The smaller H score is, the better topic representation