number_of_links

er_evaluation.number_of_links(membership)

Number of pairwise links associated with a given clustering.

Parameters:

membership (Series) – Membership vector representation of a clustering.

Returns:

Number of pairs of elements belonging to the same cluster. Note that clusters identified by NA values are excluded.

Return type:

int

Examples

>>> membership = pd.Series(index=[1,2,3,4,5,6,7,8], data=[1,1,2,3,2,4,4,4])
>>> number_of_links(membership)
5.0