Input Transformation Base Class

Abstract input transformation class.

An input transformation can be used within a Surrogate to perform a transformation of the feature variables.

See also

Other Input Transformation: InputTrafoUnitcube, mlr_input_trafos

Active bindings

label

(character(1))
Label for this object.

man

(character(1))
String in the format [pkg]::[topic] pointing to a manual page for this object.

packages

(character())
Set of required packages. A warning is signaled if at least one of the packages is not installed, but loaded (not attached) later on-demand via requireNamespace().

state

(named list() | NULL)
List of meta information regarding the parameters and their state.

search_space

(paradox::ParamSet)
Search space.

cols_x

(paradox::ParamSet)
Column ids of feature variables that should be transformed.

Methods

Public methods

• InputTrafo$new()

• InputTrafo$update()

• InputTrafo$transform()

• InputTrafo$format()

• InputTrafo$print()

• InputTrafo$clone()

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Method new()

Creates a new instance of this R6 class.

Usage

InputTrafo$new(label = NA_character_, man = NA_character_)

Arguments

label

(character(1))
Label for this object.

man

(character(1))
String in the format [pkg]::[topic] pointing to a manual page for this object.

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Method update()

Learn the transformation based on observed data and update parameters in $state. Must be implemented by subclasses.

Usage

InputTrafo$update(xdt)

Arguments

xdt

(data.table::data.table())
Data. One row per observation with at least columns $cols_x.

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Method transform()

Perform the transformation. Must be implemented by subclasses.

Usage

InputTrafo$transform(xdt)

Arguments

xdt

(data.table::data.table())
Data. One row per observation with at least columns $cols_x.

Returns

data.table::data.table() with the transformation applied to the columns $cols_x (if applicable) or a subset thereof.

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Method format()

Helper for print outputs.

Usage

InputTrafo$format()

Returns

(character(1)).

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Method print()

Print method.

Usage

InputTrafo$print()

Returns

(character()).

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Method clone()

The objects of this class are cloneable with this method.

Usage

InputTrafo$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.