MSVMOCAS(1)
NAME
msvmocas - train a multi-class linear SVM classifier
SYNOPSIS
msvmocas [options] example_file model_file
DESCRIPTION
msvmocas is a program that trains a multi-class linear SVM classifier
using the Optimized Cutting Plane Algorithm for Support Vector Machines
(OCAS) and produces a model file.
example_file is a file with training examples in SVM^light format, and
model_file is the file in which to store the learned linear rule
f(x)=W'*x. model_file contains M columns and D lines, where M is the
number of classes and D the number of dimensions, corresponding to the
elements of the matrix W [D x M].
OPTIONS
A summary of options is included below.
General options:
-h Show summary of options.
- -v (0|1)
- Set the verbosity level (default: 1)
- Learning options:
- -c float
- Regularization constant C. (default: 1)
- -n integer
- Use only the first integer examples for training. By default, integer equals the number of examples in example_file.
- Optimization options:
- -m (0|1)
- Solver to be used:
0 ... standard cutting plane (equivalent to BMRM, SVM^perf)1 ... OCAS (default) - -s integer
- Cache size for cutting planes. (default: 2000)
- Stopping conditions:
- -a float
- Absolute tolerance TolAbs: halt if QP-QD <= TolAbs. (default: 0)
- -r float
- Relative tolerance TolAbs: halt if QP-QD <= abs(QP)*TolRel. (default: 0.01)
- -q float
- Desired objective value QPValue: halt is QP <= QPValue. (default: 0)
- -t float
- Halts if the solver time (loading time is not counted) exceeds the time given in seconds. (default: infinity)
EXAMPLES
- Train the multi-class SVM classifier from example file example4_train.light, with the regularization constant C=10, verbosity switched off, and save model to msvmocas.model:
- msvmocas -c 10 -v 0 example4_train.light msvmocas.model
- Compute the testing error of the classifier stored in msvmocas.model with linclass(1) using testing examples from example4_test.light and save the predicted labels to example4_test.pred:
linclass -e -o example4_test.pred example4_test.light msvmocas.model
SEE ALSO
AUTHORS
msvmocas was written by Vojtech Franc <xfrancv@cmp.felk.cvut.cz> and
Soeren Sonnenburg <Soeren.Sonnenburg@tu-berlin.de>.
- This manual page was written by Christian Kastner <debian@kvr.at>, for
the Debian project (and may be used by others).