NAME¶

mlpack_adaboost - adaboost

SYNOPSIS¶

 mlpack_adaboost [-m unknown] [-i int] [-l string] [-T string] [-e double] [-t string] [-V bool] [-w string] [-o string] [-M unknown] [-P string] [-p string] [-h -v] 

DESCRIPTION¶

This program implements the AdaBoost (or Adaptive Boosting) algorithm. The variant of AdaBoost implemented here is AdaBoost.MH. It uses a weak learner, either decision stumps or perceptrons, and over many iterations, creates a strong learner that is a weighted ensemble of weak learners. It runs these iterations until a tolerance value is crossed for change in the value of the weighted training error.

For more information about the algorithm, see the paper "Improved Boosting Algorithms Using Confidence-Rated Predictions", by R.E. Schapire and Y. Singer.

This program allows training of an AdaBoost model, and then application of that model to a test dataset. To train a model, a dataset must be passed with the '--training_file (-t)' option. Labels can be given with the ’--labels_file (-l)' option; if no labels are specified, the labels will be assumed to be the last column of the input dataset. Alternately, an AdaBoost model may be loaded with the '--input_model_file (-m)' option.

Once a model is trained or loaded, it may be used to provide class predictions for a given test dataset. A test dataset may be specified with the ’--test_file (-T)' parameter. The predicted classes for each point in the test dataset are output to the '--predictions_file (-P)' output parameter. The AdaBoost model itself is output to the '--output_model_file (-M)' output parameter.

Note: the following parameter is deprecated and will be removed in mlpack 4.0.0: '--output_file (-o)'. Use '--predictions_file (-P)' instead of '--output_file (-o)'.

For example, to run AdaBoost on an input dataset 'data.csv' with labels ’labels.csv'and perceptrons as the weak learner type, storing the trained model in 'model.bin', one could use the following command:

$ mlpack_adaboost --training_file data.csv --labels_file labels.csv --output_model_file model.bin --weak_learner perceptron

Similarly, an already-trained model in 'model.bin' can be used to provide class predictions from test data 'test_data.csv' and store the output in ’predictions.csv' with the following command:

$ mlpack_adaboost --input_model_file model.bin --test_file test_data.csv --predictions_file predictions.csv

OPTIONAL INPUT OPTIONS¶

--help (-h) [bool]

Default help info.

--info [string]

Print help on a specific option. Default value ''.

--input_model_file (-m) [unknown]

Input AdaBoost model.

--iterations (-i) [int]

The maximum number of boosting iterations to be run (0 will run until convergence.) Default value 1000.

--labels_file (-l) [string]

Labels for the training set.

--test_file (-T) [string]

Test dataset.

--tolerance (-e) [double]

The tolerance for change in values of the weighted error during training. Default value 1e-10.

--training_file (-t) [string]

Dataset for training AdaBoost.

--verbose (-v) [bool]

Display informational messages and the full list of parameters and timers at the end of execution.

--version (-V) [bool]

Display the version of mlpack.

--weak_learner (-w) [string] The type of weak learner to use: 'decision_stump', or 'perceptron'. Default value 'decision_stump'.

OPTIONAL OUTPUT OPTIONS¶

--output_file (-o) [string]

Predicted labels for the test set.

--output_model_file (-M) [unknown]

Output trained AdaBoost model.

--predictions_file (-P) [string]

Predicted labels for the test set.

--probabilities_file (-p) [string]

Predicted class probabilities for each point in the test set.

ADDITIONAL INFORMATION¶

For further information, including relevant papers, citations, and theory, consult the documentation found at http://www.mlpack.org or included with your distribution of mlpack.