Minimal logging object for objective function evaluations
The ArchiveBest stores no data but records the best scoring evaluation
passed to $add_evals(). The Archive API is fully implemented but many
parameters are ignored and some methods do nothing. The archive still works
with TerminatorClockTime, TerminatorEvals, TerminatorNone and
TerminatorEvals.
bbotk::Archive -> ArchiveBest
n_evals(integer(1))
Number of evaluations stored in the archive.
n_batch(integer(1))
Number of batches stored in the archive.
new()
Creates a new instance of this R6 class.
ArchiveBest$new( search_space, codomain, check_values = FALSE, store_x_domain = FALSE )
search_space(paradox::ParamSet)
Specifies the search space for the Optimizer. The paradox::ParamSet
describes either a subset of the domain of the Objective or it describes
a set of parameters together with a trafo function that transforms values
from the search space to values of the domain. Depending on the context, this
value defaults to the domain of the objective.
codomain(paradox::ParamSet)
Specifies codomain of function.
Most importantly the tags of each output "Parameter" define whether it should
be minimized or maximized. The default is to minimize each component.
check_values(logical(1))
ignored.
store_x_domain(logical(1))
Determines if x values, should be stored in $data$x_domain as list
items. The trafo will be applied if defined in search_space.
add_evals()
Stores the best result in ydt.
ArchiveBest$add_evals(xdt, xss_trafoed = NULL, ydt)
xdt(data.table::data.table())
Set of untransformed points / points from the search space.
One point per row, e.g. data.table(x1 = c(1, 3), x2 = c(2, 4)).
Column names have to match ids of the search_space.
However, xdt can contain additional columns.
xss_trafoed(list())
Transformed point(s) in the domain space.
ydt(data.table::data.table())
Optimal outcome.
best()
Returns the best scoring evaluation. For single-crit optimization, the solution that minimizes / maximizes the objective function. For multi-crit optimization, the Pareto set / front.
ArchiveBest$best(m = NULL)
m(integer())
ignored.
clone()
The objects of this class are cloneable with this method.
ArchiveBest$clone(deep = FALSE)
deepWhether to make a deep clone.
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