White noise generators and AR covariance operators

firedrake/adjoint/__init__.py

@@ -32,6 +32,10 @@
     UFLEqualityConstraint  # noqa F401
 from firedrake.adjoint.ensemble_reduced_functional import EnsembleReducedFunctional  # noqa F401
 from firedrake.adjoint.transformed_functional import L2RieszMap, L2TransformedFunctional  # noqa: F401
+from firedrake.adjoint.covariance_operator import (  # noqa F401
+    WhiteNoiseGenerator, AutoregressiveCovariance,
+    PyOP2NoiseBackend, PetscNoiseBackend, VOMNoiseBackend,
+    CovarianceMat, CovariancePC)
 import numpy_adjoint  # noqa F401
 import firedrake.ufl_expr
 import types