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A simple Dictionary storing objects of class Callback. Each callback has an associated help page, see mlr_callbacks_[id].

This dictionary can get populated with additional callbacks by add-on packages. As a convention, the key should start with the name of the package, i.e. package.callback.

For a more convenient way to retrieve and construct learners, see clbk()/clbks().




An object of class DictionaryCallbacks (inherits from Dictionary, R6) of length 13.