Nothing
## superLearner
run_superLearner <- function(
dat_train,
dat_test,
dat_total,
params,
indcv,
iter,
budget,
train_method,
SL_library,
...
) {
# split/cross-validation
cv <- params$cv
## train
fit_train <- train_superLearner(
dat_train,
train_method,
SL_library)
## test
fit_test <- test_superLearner(
fit_train, dat_test, dat_total, params$n_df, params$n_tb,
indcv, iter, budget, cv
)
return(list(test = fit_test, train = fit_train))
}
#' @importFrom stats binomial gaussian
#' @importFrom SuperLearner SuperLearner
train_superLearner <- function(dat_train, train_method, SL_library) {
## format training data
training_data_elements <- create_ml_args_superLearner(dat_train)
## parameters
Y = training_data_elements[["Y"]]
X = training_data_elements[["X_expand"]]
SL_library = SL_library
if(length(unique(Y)) > 2){
fit <- SuperLearner(
Y = Y,
X = X,
family = gaussian(),
SL.library = SL_library)
}else {
fit <- SuperLearner(
Y = Y,
X = X,
family = binomial(),
SL.library = SL_library)
}
return(fit)
}
#'@importFrom stats predict runif
test_superLearner <- function(
fit_train, dat_test, dat_total, n_df, n_tb, indcv, iter, budget, cv
) {
## format data
testing_data_elements <- create_ml_args_superLearner(dat_test)
total_data_elements <- create_ml_args_superLearner(dat_total)
if(cv == TRUE){
## predict
Y0t1_total = predict(
fit_train,
testing_data_elements[["X0t_expand"]],
onlySL = TRUE)
Y1t1_total = predict(
fit_train,
total_data_elements[["X1t_expand"]],
onlySL = TRUE)
tau_total=Y1t1_total$pred-Y0t1_total$pred + runif(n_df,-1e-6,1e-6)
## compute quantities of interest
tau_test <- tau_total[indcv == iter]
That <- as.numeric(tau_total > 0)
That_p <- as.numeric(tau_total >= sort(tau_test, decreasing = TRUE)[floor(budget*length(tau_test))+1])
## output
cf_output <- list(
tau = c(tau_test, rep(NA, length(tau_total) - length(tau_test))),
tau_cv = tau_total,
That_cv = That,
That_pcv = That_p
)
}
if(cv == FALSE){
## predict
Y0t1_test = predict(
fit_train,
testing_data_elements[["X0t_expand"]],
onlySL = TRUE)
Y1t1_test = predict(
fit_train,
testing_data_elements[["X1t_expand"]],
onlySL = TRUE)
tau_test = Y1t1_test$pred - Y0t1_test$pred
## compute quantities of interest
That = as.numeric(tau_test > 0)
That_p = numeric(length(That))
That_p[sort(tau_test,decreasing =TRUE,index.return=TRUE)$ix[1:(floor(budget*length(tau_test))+1)]] = 1
## output
cf_output <- list(
tau = tau_test,
tau_cv = tau_test,
That_cv = That,
That_pcv = That_p
)
}
return(cf_output)
}
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