Preprocessing techniques defined with setpreprocessor() can be combined to a phase. Phases defined with setphase() can be combined to a grid of combinations with setgrid(). The main programmatic use with preprocomb() takes a GridClass object as argument.
GridClass is also an interface for extending the system to package 'metaheur', which takes a GridClass object to find near-optiomal combinations fast.
grid
(data frame) preprocessor combinations
data
(list) DataClass objects
validation
(data frame) validation results
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