Computes the Sokal-Michener dissimilarity between two boolean vectors u and v, which is defined as
\frac{R} {S + R}
where c_{ij} is the number of occurrences of \mathtt{u[k]} = i and \mathtt{v[k]} = j for k < n, R = 2 * (c_{TF} + c_{FT}) and S = c_{FF} + c_{TT}.
Parameters : | u : ndarray
v : ndarray
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Returns : | d : double
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