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Add utility function datablock_to_astropy #152

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Nov 20, 2024
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Add utility function datablock_to_astropy #152

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149 changes: 149 additions & 0 deletions cosmosis/test/test_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -89,3 +89,152 @@
finally:
cosmosis.utils.dulwich = dulwich_orig
del os.environ["COSMOSIS_NO_SUBPROCESS"]


def test_datablock_to_astropy():
try:
import astropy.cosmology
except ImportError:
pytest.skip("astropy not installed")

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cosmosis/test/test_utils.py#L97-L98 

Added lines #L97 - L98 were not covered by tests
block = cosmosis.DataBlock()

# implicitly should be FlatLambdaCDM
test_params = [
(astropy.cosmology.FlatLambdaCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.7,
"omega_b": 0.05,
"mnu": 0.0,
}),
(astropy.cosmology.FlatLambdaCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.7,
"omega_b": 0.05,
"mnu": 0.0,
"w": -1.0,
}),
(astropy.cosmology.FlatLambdaCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.7,
"omega_b": 0.05,
"mnu": 0.0,
"w": -1.0,
"wa": 0.0,
}),
(astropy.cosmology.FlatLambdaCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.7,
"omega_b": 0.05,
"mnu": 0.0,
"w": -1.0,
"wa": 0.0,
"omega_k": 0.0,
}),
(astropy.cosmology.FlatwCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.7,
"omega_b": 0.05,
"mnu": 0.0,
"w": -1.50,
"wa": 0.0,
"omega_k": 0.0,
}),
(astropy.cosmology.FlatwCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.7,
"omega_b": 0.05,
"mnu": 0.0,
"w": -1.50,
}),
(astropy.cosmology.Flatw0waCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.7,
"omega_b": 0.05,
"mnu": 0.0,
"w": -1.50,
"wa": 0.5,
}),
(astropy.cosmology.wCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.65,
"omega_k": 0.05,
"omega_b": 0.05,
"mnu": 0.0,
"w": -1.50,
"wa": 0.0,
}),
(astropy.cosmology.wCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.65,
"omega_k": 0.05,
"omega_b": 0.05,
"mnu": 0.0,
"w": -1.50,
}),
(astropy.cosmology.w0waCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.65,
"omega_k": 0.05,
"omega_b": 0.05,
"mnu": 0.0,
"w": -1.50,
"wa": -0.5,
}),
(astropy.cosmology.LambdaCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.65,
"omega_k": 0.05,
"omega_b": 0.05,
"mnu": 0.0,
}),
(astropy.cosmology.LambdaCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.65,
"omega_k": 0.05,
"omega_b": 0.05,
"mnu": 0.0,
"w": -1.0,
}),
(astropy.cosmology.LambdaCDM,
{
"h0": 0.7,
"omega_m": 0.3,
"omega_lambda": 0.65,
"omega_k": 0.05,
"omega_b": 0.05,
"mnu": 0.0,
"wa": 0.0,
}),

]

for expected_class, params in test_params:
block = cosmosis.DataBlock()
for k, v in params.items():
block["cosmological_parameters", k] = v
c = cosmosis.utils.datablock_to_astropy(block)
assert isinstance(c, expected_class)
55 changes: 55 additions & 0 deletions cosmosis/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,61 @@ def __getitem__(self, param):



def datablock_to_astropy(block):
from .datablock import names
cosmo = names.cosmological_parameters
from astropy.cosmology import FlatLambdaCDM, LambdaCDM, FlatwCDM, wCDM, w0waCDM, Flatw0waCDM

# Required parameters that must be in the data block
# for this to work
omega_lambda = block[cosmo, 'omega_lambda']
omega_m = block[cosmo, 'omega_m']
omega_b = block[cosmo, 'omega_b']
H0 = block[cosmo, 'h0'] * 100
m_nu = block[cosmo, 'mnu']

# Optional parameters with simple default values
omega_k = block.get_double(cosmo, 'omega_k', 0.0)
w0 = block.get_double(cosmo, 'w', -1.0)
wa = block.get_double(cosmo, 'wa', 0.0)

kw = {
"H0": H0,
"Ob0": omega_b,
"Om0": omega_m,
"m_nu": m_nu,
}

if omega_k == 0:
if wa == 0:
if w0 == -1.0:
model = FlatLambdaCDM
else:
model = FlatwCDM
kw["w0"] = w0
else:
model = Flatw0waCDM
kw["w0"] = w0
kw["wa"] = wa
else:
if wa == 0:
if w0 == -1.0:
model = LambdaCDM
kw["Ode0"] = omega_lambda
else:
model = wCDM
kw["Ode0"] = omega_lambda
kw["w0"] = w0
else:
model = w0waCDM
kw["Ode0"] = omega_lambda
kw["w0"] = w0
kw["wa"] = wa

return model(**kw)



class ParseExtraParameters(argparse.Action):

u"""Extended command-line argument parser :class:`Action` which knows how to read arguments of the form ‘section.name=value’."""
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