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Why is Euclidean distance not a good metric in high dimensions?

teaLeef · 2014
Stack Exchange · Datasets · License: CC BY-SA · 2014
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clusteringmachine-learningmetric
I read that 'Euclidean distance is not a good distance in high dimensions'. I guess this statement has something to do with the curse of dimensionality, but what exactly? Besides, what is 'high dimensions'? I have been applying hierarchical clustering using Euclidean distance with 100 features. Up to how many features is it 'safe' to use this metric?
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