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tests: further tests for covariance added.

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Fabian Joswig 2022-03-01 17:27:04 +00:00
parent 3796c0395f
commit 8d93ff95f2
1 changed files with 37 additions and 0 deletions
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37
tests/obs_test.py
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@ -636,6 +636,43 @@ def test_covariance_symmetry():
assert np.abs(cov_ab) < test_obs1.dvalue * a.dvalue * (1 + 10 * np.finfo(np.float64).eps)
def test_covariance_sum():
length = 2
t_fac = 0.4
tt = pe.misc.gen_correlated_data(np.zeros(length), 0.99 * np.ones((length, length)) + 0.01 * np.diag(np.ones(length)), 'test', tau=0.5 + t_fac * np.random.rand(length), samples=1000)
[o.gamma_method(S=0) for o in tt]
t_cov = pe.covariance(tt)
my_sum = tt[0] + tt[1]
my_sum.gamma_method(S=0)
e_cov = (my_sum.dvalue ** 2 - tt[0].dvalue ** 2 - tt[1].dvalue ** 2) / 2
assert np.isclose(e_cov, t_cov[0, 1])
def test_covariance_positive_semidefinite():
length = 64
t_fac = 1.5
tt = pe.misc.gen_correlated_data(np.zeros(length), 0.99999 * np.ones((length, length)) + 0.00001 * np.diag(np.ones(length)), 'test', tau=0.5 + t_fac * np.random.rand(length), samples=1000)
[o.gamma_method() for o in tt]
cov = pe.covariance(tt)
assert np.all(np.linalg.eigh(cov)[0] >= -1e-15)
def test_covariance_factorizing():
length = 2
t_fac = 1.5
tt = pe.misc.gen_correlated_data(np.zeros(length), 0.75 * np.ones((length, length)) + 0.8 * np.diag(np.ones(length)), 'test', tau=0.5 + t_fac * np.random.rand(length), samples=1000)
[o.gamma_method() for o in tt]
mt0 = -tt[0]
mt0.gamma_method()
assert np.isclose(pe.covariance([mt0, tt[1]])[0, 1], -pe.covariance(tt)[0, 1])
def test_empty_obs():
o = pe.Obs([np.random.rand(100)], ['test'])
q = o + pe.Obs([], [])