Nothing
#' @export
FixedPolicy <- R6::R6Class(
portable = FALSE,
class = FALSE,
inherit = Policy,
public = list(
fixed_arm = NULL,
class_name = "FixedPolicy",
initialize = function(fixed_arm) {
super$initialize()
self$fixed_arm <- fixed_arm
},
set_parameters = function(context_params) {
self$theta_to_arms <- list('n' = 0, 'mean' = 0)
},
get_action = function(t, context) {
action$choice <- self$fixed_arm
action
},
set_reward = function(t, context, action, reward) {
arm <- action$choice
reward <- reward$reward
inc(self$theta$n[[arm]]) <- 1
inc(self$theta$mean[[arm]]) <- (reward - self$theta$mean[[arm]]) / self$theta$n[[arm]]
self$theta
}
)
)
#' Policy: Fixed Arm
#'
#' \code{FixedPolicy} implements a "naive" policy which always chooses a prespecified arm.
#'
#' @name FixedPolicy
#'
#' @section Usage:
#' \preformatted{
#' policy <- FixedPolicy(fixed_arm = 1)
#' }
#'
#' @section Arguments:
#'
#' \describe{
#' \item{\code{fixed_arm}}{
#' numeric; index of the arm that will be chosen for each time step.
#' }
#' }
#'
#' @section Methods:
#'
#' \describe{
#' \item{\code{new()}}{ Generates a new \code{FixedPolicy} object. Arguments are defined in the Argument
#' section above.}
#' }
#'
#' \describe{
#' \item{\code{set_parameters()}}{each policy needs to assign the parameters it wants to keep track of
#' to list \code{self$theta_to_arms} that has to be defined in \code{set_parameters()}'s body.
#' The parameters defined here can later be accessed by arm index in the following way:
#' \code{theta[[index_of_arm]]$parameter_name}
#' }
#' }
#'
#' \describe{
#' \item{\code{get_action(context)}}{
#' here, a policy decides which arm to choose, based on the current values
#' of its parameters and, potentially, the current context.
#' }
#' }
#'
#' \describe{
#' \item{\code{set_reward(reward, context)}}{
#' in \code{set_reward(reward, context)}, a policy updates its parameter values
#' based on the reward received, and, potentially, the current context.
#' }
#' }
#'
#' @seealso
#'
#' Core contextual classes: \code{\link{Bandit}}, \code{\link{Policy}}, \code{\link{Simulator}},
#' \code{\link{Agent}}, \code{\link{History}}, \code{\link{Plot}}
#'
#' Bandit subclass examples: \code{\link{BasicBernoulliBandit}}, \code{\link{ContextualLogitBandit}},
#' \code{\link{OfflineReplayEvaluatorBandit}}
#'
#' Policy subclass examples: \code{\link{EpsilonGreedyPolicy}}, \code{\link{ContextualLinTSPolicy}}
#'
NULL
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.