mldr (version 0.4.3)

mldr_evaluate: Evaluate predictions made by a multilabel classifier

Description

Taking as input an mldr object and a matrix with the predictions given by a classifier, this function evaluates the classifier performance through several multilabel metrics.

Usage

mldr_evaluate(mldr, predictions, threshold = 0.5)

Arguments

mldr

Object of "mldr" class containing the instances to evaluate

predictions

Matrix with the labels predicted for each instance in the mldr parameter. Each element should be a value into [0,1] range

threshold

Threshold to use to generate bipartition of labels. By default the value 0.5 is used

Value

A list with multilabel predictive performance measures. The items in the list will be

• accuracy

• example_auc

• average_precision

• coverage

• fmeasure

• hamming_loss

• macro_auc

• macro_fmeasure

• macro_precision

• macro_recall

• micro_auc

• micro_fmeasure

• micro_precision

• micro_recall

• one_error

• precision

• ranking_loss

• recall

• subset_accuracy

• roc

The roc element corresponds to a roc object associated to the MicroAUC value. This object can be given as input to plot for plotting the ROC curve The example_auc, macro_auc, micro_auc and roc members will be NULL if the pROC package is not installed.

See Also

mldr, Basic metrics, Averaged metrics, Ranking-based metrics, roc.mldr

Examples

# NOT RUN {
library(mldr)

# Get the true labels in emotions
predictions <- as.matrix(emotions$dataset[, emotions$labels$index])
# and introduce some noise (alternatively get the predictions from some classifier)
noised_labels <- cbind(sample(1:593, 200, replace = TRUE), sample(1:6, 200, replace = TRUE))
predictions[noised_labels] <- sample(0:1, 100, replace = TRUE)
# then evaluate predictive performance
res <- mldr_evaluate(emotions, predictions)
str(res)
plot(res$roc, main = "ROC curve for emotions")
# }