test_density.py 文件源码

def test_entropy():
    up = JzKet(S(1)/2, S(1)/2)
    down = JzKet(S(1)/2, -S(1)/2)
    d = Density((up, 0.5), (down, 0.5))

    # test for density object
    ent = entropy(d)
    assert entropy(d) == 0.5*log(2)
    assert d.entropy() == 0.5*log(2)

    np = import_module('numpy', min_module_version='1.4.0')
    if np:
        #do this test only if 'numpy' is available on test machine
        np_mat = represent(d, format='numpy')
        ent = entropy(np_mat)
        assert isinstance(np_mat, np.matrixlib.defmatrix.matrix)
        assert ent.real == 0.69314718055994529
        assert ent.imag == 0

    scipy = import_module('scipy', __import__kwargs={'fromlist': ['sparse']})
    if scipy and np:
        #do this test only if numpy and scipy are available
        mat = represent(d, format="scipy.sparse")
        assert isinstance(mat, scipy_sparse_matrix)
        assert ent.real == 0.69314718055994529
        assert ent.imag == 0