Computes the Canberra distance between two n-vectors u and v, which is defined as
\frac{\sum_i {|u_i-v_i|}} {\sum_i {|u_i|+|v_i|}}.
u : ndarray
An n-dimensional vector.
v : ndarray
d : double
The Canberra distance between vectors u and v.
scipy.spatial.distance.braycurtis
scipy.spatial.distance.chebyshev
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