NoiseFiltersR contains an extensive implementation of state-of-the-art and classical label noise preprocessing algorithms for classification problems. Such a collection was missing for R statistical software.
Namely, NoiseFiltersR includes 30 label noise filters. All of them are appropriately
documented, with a general explanation of the method and the exact reference where it was first published.
Moreover, they can be called in a R-user-friendly manner, and their results are unified by means of the
filter class, which also benefits from adapted
install.packages to install NoiseFiltersR and its dependencies from CRAN:
Once installed, use the command
library to attach the package:
Example of use
Once the package is installed and attached, the user can apply any of the implemented algorithms.
Next instruction shows how to use the well-known Iterative Partitioning Filter (IPF) (Khoshgoftaar & Rebours, 2007) to
filter out class noise from the dataset
iris. The formula allows us to indicate the classification
variable. Default parameters for the algorithm are considered:
out <- IPF(Species~., data = iris)
Then, the variable
out is an object of class
filter. This is a list with seven elements:
cleanData: a data frame containing the filtered dataset.
remIdx: a vector of integers indicating the indexes for
removed instances (i.e. their row number with respect to the original data frame).
repIdx: a vector of integers indicating the indexes for
repaired/relabelled instances (i.e. their row number with respect to the original data frame).
repLab: a factor containing the new labels for repaired instances.
parameters: a list containing the tuning parameters used for the filter.
call: an expression that contains the original call to the filter.
extraInf: a character that includes additional relevant
information not covered by previous items.
To appropriately display the information contained in a
filter object, general functions
summary can be used (more details about their output can be found in the package vignette):
Finally, all the implemented algorithms can also be used without a formula argument, just indicating the dataset to be preprocessed and the column that contains the classification variable (last column is assumed by default):
out <- IPF(iris, classColumn = 5)
For more specific information on how to use each filter, please refer to the functions documentation page and the examples contained therein. For a general overview of the NoiseFiltersR package, please look up the associated vignette.