The module provides feature selection functions which extract
hidden features, i.e. all features which can be constructed
(by means of cartesian product) on the basis of the set of
observations and the set of labels.
For example, the list of hidden observation features can
be defined as
<*> xs, where os is a
list of all observations and xs is a list of all labels.
You can mix functions defined here with the selection functions from the Data.CRF.Chain1.Feature.Present module.
Features of all types which can be constructed
based on the dataset.
OFeatures which can be constructed based on the dataset.
TFeatures which can be constructed based on the dataset.