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