model_selection: model_selection

In mlampros/RandomSearchR: Random Search in R

Description

compare pairs of models using statistics such as t.test, correlation, evaluation.

Usage

model_selection(
  list_of_algos,
  on_Train = FALSE,
  regression = TRUE,
  evaluation_metric = NULL,
  t.test.conf.int = 0.95,
  cor_test = NULL,
  sort_decreasing = TRUE
)

Arguments

list_of_algos	a list of model objects (first use the subset_mods to select the best and then re-run)
on_Train	if TRUE, then it applies the test-statistics on train-data
regression	is it a regression or a classification task
evaluation_metric	one of the evaluation metrics (accuracy, rmse, etc.)
t.test.conf.int	specify confidence interval for the t.test statistic (0.95, 0.99, etc.)
cor_test	one of spearman, pearson, kendal
sort_decreasing	sorts the resulted data.frame by the evaluation metric of the first algorithm in either increasing or decreasing order

Details

This function takes a list of objects after they were subset and re-run on the same resampling method. It returns a data frame with statistics for each pair of them.

Value

a data frame

Examples

## Not run: 

#..............
# random-forest
#..............

res_rf = random_search_resample(as.factor(y1), tune_iters = 30,

                              resampling_method = list(method = 'cross_validation', 
                                                      repeats = NULL, 
                                                      sample_rate = NULL, 
                                                      folds = 5),

                              ALGORITHM = list(package = require(randomForest), 
                                               algorithm = randomForest),

                              grid_params = bst_m$rf,

                              DATA = list(x = X, y = as.factor(y1)),

                              Args = NULL,

                              regression = FALSE, re_run_params = TRUE)


#..............
# RWeka Bagging
#..............

res_logitBoost = random_search_resample(as.factor(y1), tune_iters = 30,

                                        resampling_method = list(method = 'cross_validation', 
                                                                 repeats = NULL, 
                                                                 sample_rate = NULL,
                                                                 folds = 5),

                                        ALGORITHM = list(package = require(RWeka), 
                                                         algorithm = LogitBoost),

                                        grid_params = bst_m$logitboost_weka,

                                        DATA = list(formula = form, data = ALL_DATA),

                                        Args = NULL,

                                        regression = FALSE, re_run_params = TRUE)


tmp_lst = list(rf = res_rf, LogBoost = res_logitBoost)

res = model_selection(tmp_lst, 
                      on_Train = FALSE, 
                      regression = FALSE, 
                      evaluation_metric = 'acc',
                      t.test.conf.int = 0.95, 
                      cor_test = list(method = 'spearman'), 
                      sort_decreasing = TRUE)

res


## End(Not run)

mlampros/RandomSearchR documentation built on Feb. 18, 2021, 9:48 a.m.