mlr3 (version 0.12.0)

as_prediction_regr: Convert to a Regression Prediction

Description

Convert object to a PredictionRegr.

Usage

as_prediction_regr(x, ...)
# S3 method for PredictionRegr
as_prediction_regr(x, ...)
# S3 method for data.frame
as_prediction_regr(x, ...)

Arguments

x

(any) Object to convert.

...

(any) Additional arguments.

Value

PredictionRegr.

Examples

# NOT RUN {
# create a prediction object
task = tsk("mtcars")
learner = lrn("regr.rpart")
learner$train(task)
p = learner$predict(task)

# convert to a data.table
tab = as.data.table(p)

# convert back to a Prediction
as_prediction_regr(tab)

# split data.table into a list of data.tables
tabs = split(tab, cut(tab$truth, 3))

# convert back to list of predictions
preds = lapply(tabs, as_prediction_regr)

# calculate performance in each group
sapply(preds, function(p) p$score())
# }