METRICS

1) Adjusted/ Unadjusted Rand Index:

• Given the knowledge of the ground truth class assignments labels_true and our clustering algorithm assignments of the same samples labels_pred, the (adjusted or unadjusted) Rand index is a function that measures the similarity of the two assignments, ignoring permutations.

• If C is a ground truth class assignment and K the clustering, let us define  and  as:

  1. a the number of pairs of elements that are in the same set in C and in the same set in K

  2. b the number of pairs of elements that are in different sets in C and in different sets in K

References:

• https://scikit-learn.org/stable/modules/clustering.html#clustering-performance-evaluation

• n2  n0

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