Optimizer

Abstract Optimizer class that implements the base functionality each Optimizer subclass must provide. A Optimizer object describes the optimization strategy. A Optimizer object must write its result to the $assign_result() method of the OptimInstance at the end in order to store the best point and its estimated performance vector.

Progress Bars

$optimize() supports progress bars via the package progressr combined with a Terminator. Simply wrap the function in progressr::with_progress() to enable them. We recommend to use package progress as backend; enable with progressr::handlers("progress").

Public fields

id

(character(1))
Identifier of the object. Used in tables, plot and text output.

Active bindings

param_set

paradox::ParamSet
Set of control parameters.

label

(character(1))
Label for this object. Can be used in tables, plot and text output instead of the ID.

man

(character(1))
String in the format [pkg]::[topic] pointing to a manual page for this object. The referenced help package can be opened via method $help().

param_classes

(character())
Supported parameter classes that the optimizer can optimize, as given in the paradox::ParamSet $class field.

properties

(character())
Set of properties of the optimizer. Must be a subset of bbotk_reflections$optimizer_properties.

packages

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

Methods

Public methods

• Optimizer$new()

• Optimizer$format()

• Optimizer$print()

• Optimizer$help()

• Optimizer$optimize()

• Optimizer$clone()

---

Method new()

Creates a new instance of this R6 class.

Usage

Optimizer$new(
  id = "optimizer",
  param_set,
  param_classes,
  properties,
  packages = character(),
  label = NA_character_,
  man = NA_character_
)

Arguments

id

(character(1))
Identifier for the new instance.

param_set

(paradox::ParamSet)
Set of control parameters.

param_classes

(character())
Supported parameter classes that the optimizer can optimize, as given in the paradox::ParamSet $class field.

properties

(character())
Set of properties of the optimizer. Must be a subset of bbotk_reflections$optimizer_properties.

packages

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

label

(character(1))
Label for this object. Can be used in tables, plot and text output instead of the ID.

man

(character(1))
String in the format [pkg]::[topic] pointing to a manual page for this object. The referenced help package can be opened via method $help().

---

Method format()

Helper for print outputs.

Usage

Optimizer$format(...)

Arguments

...

(ignored).

---

Method print()

Print method.

Usage

Optimizer$print()

Returns

(character()).

---

Method help()

Opens the corresponding help page referenced by field $man.

Usage

Optimizer$help()

---

Method optimize()

Performs the optimization and writes optimization result into OptimInstance. The optimization result is returned but the complete optimization path is stored in Archive of OptimInstance.

Usage

Optimizer$optimize(inst)

Arguments

inst

(OptimInstance).

Returns

data.table::data.table.

---

Method clone()

The objects of this class are cloneable with this method.

Usage

Optimizer$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.