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# October 26, 2018
#' Class \code{LogitSurrogate}
#'
#' Logistic surrogate for 0/1 loss function.
#'
#' @name LogitSurrogate-class
#'
#' @keywords internal
#'
#' @include L_Surrogate.R
setClass(Class = "LogitSurrogate", contains = "Surrogate")
##########
## METHODS
##########
#' Methods Available for Objects of Class \code{LogitSurrogate}
#'
#' @name LogitSurrogate-methods
#'
#' @keywords internal
NULL
#' \code{.phiFunc}
#' calculates logistic surrogate loss-function
#'
#' @rdname LogitSurrogate-methods
setMethod(f = ".phiFunc",
signature = c(surrogate = "LogitSurrogate"),
definition = function(surrogate, u) {
return( log(x = 1.0 + exp(x = -u)))
})
#' \code{.dphiFunc}
#' calculates derivative of logistic surrogate loss-function
#'
#' @rdname LogitSurrogate-methods
setMethod(f = ".dPhiFunc",
signature = c(surrogate = "LogitSurrogate"),
definition = function(surrogate, u, du) {
expu <- exp(x = -u)
return( - {expu / {1.0 + expu}} * du)
})
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