Tuned Model
Model tuning over a grid of parameter values.
TunedModel(
model,
grid = MachineShop::settings("grid"),
fixed = list(),
control = MachineShop::settings("control"),
metrics = NULL,
stat = MachineShop::settings("stat.train"),
cutoff = MachineShop::settings("cutoff")
)model |
model function, function name, or call defining the model to be tuned. |
grid |
single integer or vector of integers whose positions or names
match the parameters in the model's pre-defined tuning grid if one exists
and which specify the number of values used to construct the grid;
|
fixed |
list of fixed parameter values to combine with those in
|
control |
control function, function name, or call defining the resampling method to be employed. |
metrics |
metric function, function name, or vector of these with which to calculate performance. If not specified, default metrics defined in the performance functions are used. Model selection is based on the first calculated metric. |
stat |
function or character string naming a function to compute a summary statistic on resampled metric values for model tuning. |
cutoff |
argument passed to the |
The expand_modelgrid function enables manual extraction and
viewing of grids created automatically when a TunedModel is fit.
factor, numeric, ordered,
Surv
TunedModel class object that inherits from MLModel.
## Requires prior installation of suggested package gbm to run
## May require a long runtime
# Automatically generated grid
model_fit <- fit(sale_amount ~ ., data = ICHomes,
model = TunedModel(GBMModel))
varimp(model_fit)
(tuned_model <- as.MLModel(model_fit))
summary(tuned_model)
plot(tuned_model, type = "l")
# Randomly sampled grid points
fit(sale_amount ~ ., data = ICHomes,
model = TunedModel(GBMModel, grid = Grid(size = 1000, random = 5)))
# User-specified grid
fit(sale_amount ~ ., data = ICHomes,
model = TunedModel(GBMModel,
grid = expand_params(n.trees = c(50, 100),
interaction.depth = 1:2,
n.minobsinnode = c(5, 10))))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.