CallbackApply

class odl.solvers.util.callback.CallbackApply(function, step=1)

Bases: Callback

Callback for applying a custom function to iterates.

Methods

__call__(result)	Apply function to result.
reset()	Set iter to 0.

__init__(function, step=1)

Initialize a new instance.

Parameters:

functioncallable

Function to call on the current iterate.

stepint, optional

Number of iterates between applications of function.

Examples

By default, the function is called on each iterate:

>>> def func(x):
...     print(np.max(x))
>>> callback = CallbackApply(func)
>>> x = odl.rn(3).element([1, 2, 3])
>>> callback(x)
3.0
>>> callback(x)
3.0

To apply only to each n-th iterate, supply step=n:

>>> callback = CallbackApply(func, step=2)
>>> callback(x)
3.0
>>> callback(x)  # no output
>>> callback(x)  # next output
3.0