def test_centroid():
rdf_space = Space('tests/example.n3')
# Overriding _ut
rdf_space._ut = np.array([[0,1,0,0],[1,0,0,0],[0,1,0,0],[1,1,1,1]], dtype=float).T
# Overriding uri_index
rdf_space.uri_index = {'http://0': 0, 'http://1': 1, 'http://2': 2, 'http://3': 3}
centroid = rdf_space.centroid(['http://0', 'http://1', 'http://2', 'http://3'])
assert_array_equal(centroid, np.array([0.5, 0.75, 0.25, 0.25]))
centroid = rdf_space.centroid(['http://0', 'http://3'])
assert_array_equal(centroid, np.array([0.5, 1, 0.5, 0.5]))
centroid = rdf_space.centroid(['http://0', 'http://1'])
assert_array_equal(centroid, np.array([0.5, 0.5, 0, 0]))
centroid = rdf_space.centroid(['http://0', 'http://6'])
assert_array_equal(centroid, np.array([0, 1, 0, 0]))
centroid = rdf_space.centroid([])
assert_array_equal(centroid, None)
