def test_downsampling2():
    a = CompressionAverageOperator(3)
    assert_almost_equal(a.todense(9).T, a.T.todense(3))
def test_compression_average3():
    a = CompressionAverageOperator(3)
    assert_almost_equal(a.todense(9).T, a.T.todense(3))