Removed `_inverse_adjoint_times` from Operator classes.

nifty/operators/composed_operator/composed_operator.py

@@ -131,9 +131,6 @@ class ComposedOperator(LinearOperator):
     def _adjoint_inverse_times(self, x, spaces):
         return self._times_helper(x, spaces, func='adjoint_inverse_times')
 
-    def _inverse_adjoint_times(self, x, spaces):
-        return self._times_helper(x, spaces, func='inverse_adjoint_times')
-
     def _times_helper(self, x, spaces, func):
         space_index = 0
         if spaces is None:

nifty/operators/invertible_operator_mixin/invertible_operator_mixin.py

@@ -103,8 +103,3 @@ class InvertibleOperatorMixin(object):
                                                 b=x,
                                                 x0=x0)
         return result
-
-    #MR FIXME: why? shouldn't this be equivalent to the adjoint inverse?
-    def _inverse_adjoint_times(self, x, spaces):
-        raise NotImplementedError(
-            "no generic instance method 'inverse_adjoint_times'.")

nifty/operators/linear_operator/linear_operator.py

@@ -269,10 +269,6 @@ class LinearOperator(Loggable, object):
         raise NotImplementedError(
             "no generic instance method 'adjoint_inverse_times'.")
 
-    def _inverse_adjoint_times(self, x, spaces):
-        raise NotImplementedError(
-            "no generic instance method 'inverse_adjoint_times'.")
-
     def _check_input_compatibility(self, x, spaces, inverse=False):
         if not isinstance(x, Field):
             raise ValueError(