Computes the Bray-Curtis distance between two n-vectors u and v, which is defined as
\sum{|u_i-v_i|} / \sum{|u_i+v_i|}.
u : ndarray
An n-dimensional vector.
v : ndarray
d : double
The Bray-Curtis distance between vectors u and v.
scipy.spatial.distance.num_obs_y
scipy.spatial.distance.canberra
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