bbotk (version 1.7.1)

ArchiveAsyncFrozen: Frozen Rush Data Storage

Description

Freezes the Redis data base of an ArchiveAsync to a data.table::data.table(). No further points can be added to the archive but the data can be accessed and analyzed. Useful when the Redis data base is not permanently available. Use the callback bbotk.async_freeze_archive to freeze the archive after the optimization has finished.

S3 Methods

• as.data.table(archive)
  ArchiveAsync -> data.table::data.table()
  Returns a tabular view of all performed function calls of the Objective. The x_domain column is unnested to separate columns.

Super classes

bbotk::Archive -> bbotk::ArchiveAsync -> ArchiveAsyncFrozen

Active bindings

data

(data.table::data.table)
Data table with all finished points.

queued_data

(data.table::data.table)
Data table with all queued points.

running_data

(data.table::data.table)
Data table with all running points.

finished_data

(data.table::data.table)
Data table with all finished points.

failed_data

(data.table::data.table)
Data table with all failed points.

n_queued

(integer(1))
Number of queued points.

n_running

(integer(1))
Number of running points.

n_finished

(integer(1))
Number of finished points.

n_failed

(integer(1))
Number of failed points.

n_evals

(integer(1))
Number of evaluations stored in the archive.

Methods

Public methods

• ArchiveAsyncFrozen$new()

• ArchiveAsyncFrozen$push_points()

• ArchiveAsyncFrozen$pop_point()

• ArchiveAsyncFrozen$push_running_point()

• ArchiveAsyncFrozen$push_result()

• ArchiveAsyncFrozen$push_failed_point()

• ArchiveAsyncFrozen$data_with_state()

• ArchiveAsyncFrozen$clear()

• ArchiveAsyncFrozen$clone()

Inherited methods

• bbotk::Archive$format()
• bbotk::Archive$help()
• bbotk::Archive$print()
• bbotk::ArchiveAsync$best()
• bbotk::ArchiveAsync$nds_selection()

---

Method new()

Creates a new instance of this R6 class.

Usage

ArchiveAsyncFrozen$new(archive)

Arguments

archive

(ArchiveAsync)
The archive to freeze.

---

Method push_points()

Push queued points to the archive.

Usage

ArchiveAsyncFrozen$push_points(xss)

Arguments

xss

(list of named list())
List of named lists of point values.

---

Method pop_point()

Pop a point from the queue.

Usage

ArchiveAsyncFrozen$pop_point()

---

Method push_running_point()

Push running point to the archive.

Usage

ArchiveAsyncFrozen$push_running_point(xs, extra = NULL)

Arguments

xs

(named list)
Named list of point values.

extra

(list())
Named list of additional information.

---

Method push_result()

Push result to the archive.

Usage

ArchiveAsyncFrozen$push_result(key, ys, x_domain, extra = NULL)

Arguments

key

(character())
Key of the point.

ys

(list())
Named list of results.

x_domain

(list())
Named list of transformed point values.

extra

(list())
Named list of additional information.

---

Method push_failed_point()

Push failed point to the archive.

Usage

ArchiveAsyncFrozen$push_failed_point(key, message)

Arguments

key

(character())
Key of the point.

message

(character())
Error message.

---

Method data_with_state()

Fetch points with a specific state.

Usage

ArchiveAsyncFrozen$data_with_state(
  fields = c("xs", "ys", "xs_extra", "worker_extra", "ys_extra", "condition"),
  states = c("queued", "running", "finished", "failed"),
  reset_cache = FALSE
)

Arguments

fields

(character())
Fields to fetch. Defaults to c("xs", "ys", "xs_extra", "worker_extra", "ys_extra").

states

(character())
States of the tasks to be fetched. Defaults to c("queued", "running", "finished", "failed").

reset_cache

(logical(1))
Whether to reset the cache of the finished points.

---

Method clear()

Clear all evaluation results from archive.

Usage

ArchiveAsyncFrozen$clear()

---

Method clone()

The objects of this class are cloneable with this method.

Usage

ArchiveAsyncFrozen$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

See Also

ArchiveAsync

Examples

# example only runs if a Redis server is available
if (mlr3misc::require_namespaces(c("rush", "redux", "mirai"), quietly = TRUE) &&
  redux::redis_available()) {
# define the objective function
fun = function(xs) {
  list(y = - (xs[[1]] - 2)^2 - (xs[[2]] + 3)^2 + 10)
}

# set domain
domain = ps(
  x1 = p_dbl(-10, 10),
  x2 = p_dbl(-5, 5)
)

# set codomain
codomain = ps(
  y = p_dbl(tags = "maximize")
)

# create objective
objective = ObjectiveRFun$new(
  fun = fun,
  domain = domain,
  codomain = codomain,
  properties = "deterministic"
)

# start workers
rush::rush_plan(worker_type = "remote")
mirai::daemons(1)

# initialize instance
instance = oi_async(
  objective = objective,
  terminator = trm("evals", n_evals = 20),
  callback = clbk("bbotk.async_freeze_archive")
)

# load optimizer
optimizer = opt("async_random_search")

# trigger optimization
optimizer$optimize(instance)

# frozen archive
instance$archive

# best performing configuration
instance$archive$best()

# covert to data.table
as.data.table(instance$archive)
}