Work on Subset


Synopsis

Selects one attribute (or a subset) via a regular expression and applies its inner operators to the resulting subset.


Description

This operator can be used to select one attribute (or a subset) by defining a regular expression for the attribute name and applies its inner operators to the resulting subset. Please note that this operator will also use special attributes which makes it necessary for all preprocessing steps which should be performed on special attributes (and are normally not performed on special attributes).

This operator is also able to deliver the additional results of the inner operator if desired.

Afterwards, the remaining original attributes are added to the resulting example set if the parameter "keep_subset_only" is set to false (default).

Please note that this operator is very powerful and can be used to create new preprocessing schemes by combinating it with other preprocessing operators. Hoewever, there are two major restrictions (among some others): first, since the inner result will be combined with the rest of the input example set, the number of examples (data points) is not allowed to be changed inside of the subset preprocessing. Second, attribute role changes will not be delivered to the outside since internally all special attributes will be changed to regular for the inner operators and role changes can afterwards not be delivered.


Input


Output


Parameters


ExampleProcess