Commit ff54ff45 authored by Philipp Arras's avatar Philipp Arras

Allow inverse samples from sandwiches which are diagonal

parent 23b0ed81
Pipeline #29459 passed with stages
in 4 minutes and 12 seconds
......@@ -16,9 +16,11 @@
# NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
# and financially supported by the Studienstiftung des deutschen Volkes.
import numpy as np
from .diagonal_operator import DiagonalOperator
from .endomorphic_operator import EndomorphicOperator
from .scaling_operator import ScalingOperator
import numpy as np
class SandwichOperator(EndomorphicOperator):
......@@ -54,8 +56,15 @@ class SandwichOperator(EndomorphicOperator):
return self._op.apply(x, mode)
def draw_sample(self, from_inverse=False, dtype=np.float64):
# Drawing samples from diagonal operators is easy (inverse is possible)
if isinstance(self._op, (ScalingOperator, DiagonalOperator)):
return self._op.draw_sample(from_inverse, dtype)
# Inverse samples from general sandwiches is not possible
if from_inverse:
raise NotImplementedError(
"cannot draw from inverse of this operator")
# Samples from general sandwiches
return self._bun.adjoint_times(
self._cheese.draw_sample(from_inverse, dtype))
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