MAINT: update for wcosmo astropy-like (#97)

* MAINT: update for wcosmo astropy-like

* MAINT: update to wcosmo astropy-like

* FORMAT: add empty line

* MAINT: update inheritance test for new wcosmo

* TST: make tests work for different backends

gwpopulation/experimental/cosmo_models.py

@@ -7,7 +7,9 @@
 """
 
 import numpy as xp
-from wcosmo import FlatwCDM, available, z_at_value
+from wcosmo import z_at_value
+from wcosmo.astropy import WCosmoMixin, available
+from wcosmo.utils import disable_units as wcosmo_disable_units
 
 from .jax import NonCachingModel
 
@@ -24,6 +26,7 @@ class CosmoMixin:
     """
 
     def __init__(self, cosmo_model="Planck15"):
+        wcosmo_disable_units()
         self.cosmo_model = cosmo_model
         if self.cosmo_model == "FlatwCDM":
             self.cosmology_names = ["H0", "Om0", "w0"]
@@ -60,10 +63,10 @@ def cosmology(self, parameters):
 
         Returns
         =======
-        wcosmo.FlatwCDM
+        wcosmo.astropy.WCosmoMixin
             The cosmology model.
         """
-        if isinstance(self._cosmo, FlatwCDM):
+        if isinstance(self._cosmo, WCosmoMixin):
             return self._cosmo
         else:
             return self._cosmo(**self.cosmology_variables(parameters))

gwpopulation/models/redshift.py

@@ -274,7 +274,10 @@ def total_four_volume(lamb, analysis_time, max_redshift=2.3):
     -----
     This assumes a :code:`Planck15` cosmology.
     """
-    from wcosmo.wcosmo import Planck15
+    from wcosmo.astropy import Planck15
+    from wcosmo.utils import disable_units
+
+    disable_units()
 
     redshifts = xp.linspace(0, max_redshift, 2500)
     psi_of_z = (1 + redshifts) ** lamb

test/redshift_test.py

@@ -1,7 +1,8 @@
 import numpy as np
 import pytest
-from astropy.cosmology import Planck15
 from bilby.core.prior import PriorDict, Uniform
+from wcosmo.astropy import Planck15
+from wcosmo.utils import disable_units
 
 import gwpopulation
 from gwpopulation.models import redshift
@@ -50,13 +51,14 @@ def test_powerlaw_volume(backend):
     trivial case
     """
     gwpopulation.set_backend(backend)
+    disable_units()
     xp = gwpopulation.utils.xp
     zs = xp.linspace(1e-3, 2.3, 1000)
     zs_numpy = gwpopulation.utils.to_numpy(zs)
     model = redshift.PowerLawRedshift()
     parameters = dict(lamb=1)
     total_volume = np.trapz(
-        Planck15.differential_comoving_volume(zs_numpy).value * 4 * np.pi,
+        Planck15.differential_comoving_volume(zs_numpy) * 4 * np.pi,
         zs_numpy,
     )
     approximation = float(model.normalisation(parameters))
@@ -69,8 +71,9 @@ def test_zero_outside_domain():
 
 
 def test_four_volume():
+    disable_units()
     assert (
-        Planck15.comoving_volume(2.3).value / 1e9
+        Planck15.comoving_volume(2.3) / 1e9
         - redshift.total_four_volume(lamb=1, analysis_time=1, max_redshift=2.3)
         < 1e-3
     )