def test_basic():
lengthscale = 0.5
points = np.random.rand(30, 2).astype(np.float32)
grid = spatial.Grid2d(points, lengthscale)
print(grid.permutation)
print(grid.pivots) #[:grid.n_buckets+1])
print(grid.n_buckets)
print(grid.cells[grid.permutation])
