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from theano import tensor
import numpy
def hdist(a, b):
rearth = numpy.float32(6371)
deg2rad = numpy.float32(3.14159265358979 / 180)
lat1 = a[:, 0] * deg2rad
lon1 = a[:, 1] * deg2rad
lat2 = b[:, 0] * deg2rad
lon2 = b[:, 1] * deg2rad
dlat = abs(lat1-lat2)
dlon = abs(lon1-lon2)
al = tensor.sin(dlat/2)**2 + tensor.cos(lat1) * tensor.cos(lat2) * (tensor.sin(dlon/2)**2)
d = tensor.arctan2(tensor.sqrt(al), tensor.sqrt(numpy.float32(1)-al))
hd = 2 * rearth * d
return tensor.switch(tensor.eq(hd, float('nan')), (a-b).norm(2, axis=1), hd)
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