def SetReducer(self, reducer, arraylike=False):
"""apply a reducer function to the cost function
input::
- a reducer function of the form: y' = reducer(yk), where yk is a results
vector and y' is a single value. Ideally, this method is applied to
a cost function with a multi-value return, to reduce the output to a
single value. If arraylike, the reducer provided should take a single
array as input and produce a scalar; otherwise, the reducer provided
should meet the requirements of the python's builtin 'reduce' method
(e.g. lambda x,y: x+y), taking two scalars and producing a scalar."""
if not reducer:
self._reducer = None
elif not isinstance(reducer, collections.Callable):
raise TypeError("'%s' is not a callable function" % reducer)
elif not arraylike:
self._reducer = wrap_reducer(reducer)
else: #XXX: check if is arraylike?
self._reducer = reducer
return self._update_objective()
def SetReducer(self, reducer, arraylike=False):
"""apply a reducer function to the cost function
input::
- a reducer function of the form: y' = reducer(yk), where yk is a results
vector and y' is a single value. Ideally, this method is applied to
a cost function with a multi-value return, to reduce the output to a
single value. If arraylike, the reducer provided should take a single
array as input and produce a scalar; otherwise, the reducer provided
should meet the requirements of the python's builtin 'reduce' method
(e.g. lambda x,y: x+y), taking two scalars and producing a scalar."""
if not reducer:
self._reducer = None
elif not callable(reducer):
raise TypeError, "'%s' is not a callable function" % reducer
elif not arraylike:
self._reducer = wrap_reducer(reducer)
else: #XXX: check if is arraylike?
self._reducer = reducer
return