Sørensen-Dice Index

• very similar to Jaccard index
• Although they are calculated similarly the Sørensen-Dice index is a bit more intuitive because it can be seen as the percentage of overlap between two sets, which is a value between 0 and 1
• overstate the importance of sets with little to no ground truth positive sets
• As a result, it could dominate the average score taken over multiple sets
• It weights each item inversely proportionally to the size of the relevant set rather than treating them equally.
• $$D(x,y) = \frac{2|x\cap y|}{|x|+|y|}$
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