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I am studying to get my first job as data scientist and I stumbled upon this. I have been banging my head on the wall for hrs to understand this concept. But couldn't get concrete answer. Just 1 example will be enough.

https://slideplayer.com/slide/14318989/ It is page number 34 of the given slide.

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The definitions are given on slide 33. For example, for recall of each cluster you need to find

niki

which you can infer from the definition above:

Assign to cluster i the class ki such that ki = argmaxjnij

which simply says for each cluster, the index of the highest n is defined as ki. For the case of cluster 1 on the left, it is cluster 3, so the index is 3. which gives:

niki = n13 = 85

and the denominator is

cki = c3 = 100

So you get the recall for cluster 1 on the left as 85/100.

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