as_prediction_classif: Convert to a Classification Prediction

In mlr-org/mlr3: Machine Learning in R - Next Generation

Convert to a Classification Prediction

Description

Convert object to a PredictionClassif.

Usage

as_prediction_classif(x, ...)

## S3 method for class 'PredictionClassif'
as_prediction_classif(x, ...)

## S3 method for class 'data.frame'
as_prediction_classif(x, ...)

Arguments

x	(any) Object to convert.
...	(any) Additional arguments.

Value

PredictionClassif.

Examples

# create a prediction object
task = tsk("penguins")
learner = lrn("classif.rpart", predict_type = "prob")
learner$train(task)
p = learner$predict(task)

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

# convert back to a Prediction
as_prediction_classif(tab)

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

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

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

mlr-org/mlr3 documentation built on July 10, 2024, 10:53 a.m.