def _check_inputs(self, operators, weights):
"""Check inputs.
This method cheks that the input operators and weights are correctly
formatted.
Parameters
----------
operators : list, tuple or numpy.ndarray
List of linear operator class instances
weights : list, tuple or numpy.ndarray
List of weights for combining the linear adjoint operator results
Returns
-------
tuple
Operators and weights
Raises
------
ValueError
If the number of weights does not match the number of operators
TypeError
If the individual weight values are not floats
"""
operators = self._check_type(operators)
for operator in operators:
if not hasattr(operator, 'op'):
raise ValueError('Operators must contain "op" method.')
if not hasattr(operator, 'adj_op'):
raise ValueError('Operators must contain "adj_op" method.')
operator.op = check_callable(operator.op)
operator.cost = check_callable(operator.adj_op)
if not isinstance(weights, type(None)):
weights = self._check_type(weights)
if weights.size != operators.size:
raise ValueError(
'The number of weights must match the number of ' +
'operators.', )
if not np.issubdtype(weights.dtype, np.floating):
raise TypeError('The weights must be a list of float values.')
return operators, weights
def _check_operators(self, operators):
"""Check operators.
This method cheks that the input operators and weights are correctly
formatted.
Parameters
----------
operators : list, tuple or numpy.ndarray
List of linear operator class instances
Returns
-------
numpy.ndarray
Operators
Raises
------
TypeError
For invalid input type
ValueError
For empty list
ValueError
For missing op method
ValueError
For missing cost method
"""
if not isinstance(operators, (list, tuple, np.ndarray)):
raise TypeError(
'Invalid input type, operators must be a list, tuple or '
+ 'numpy array.',
)
operators = np.array(operators)
if not operators.size:
raise ValueError('Operator list is empty.')
for operator in operators:
if not hasattr(operator, 'op'):
raise ValueError('Operators must contain "op" method.')
if not hasattr(operator, 'cost'):
raise ValueError('Operators must contain "cost" method.')
operator.op = check_callable(operator.op)
operator.cost = check_callable(operator.cost)
return operators
def _check_operators(self):
"""Check Operators
This method checks if the input operators have a "cost" method
Raises
------
ValueError
For invalid operators type
ValueError
For operators without "cost" method
"""
if not isinstance(self._operators, (list, tuple, np.ndarray)):
raise TypeError(('Input operators must be provided as a list, '
'not {}').format(type(self._operators)))
for op in self._operators:
if not hasattr(op, 'cost'):
raise ValueError('Operators must contain "cost" method.')
op.cost = check_callable(op.cost)
def cost(self, method):
self._cost = check_callable(method)
def get_grad(self, method):
self._get_grad = check_callable(method)
def trans_op(self, operator):
self._trans_op = check_callable(operator)
def op(self, operator):
self._op = check_callable(operator)
