pysvmlight

This is a wrapper for the svmlight library. It allows you to specify an unbiased hyperplane. It also allows you to access the learnt hyperplane after training.

See the svmlight website (http://svmlight.joachims.org/) for full details.

Example of use:

>>> f = DocumentFactory()
>>> docs = [f.new(x.split()) for x in [
...         "this is a nice long document",
...         "this is another nice long document",
...         "this is rather a short document",
...         "a horrible document",
...         "another horrible document"]]
>>> l = Learner()
>>> model = l.learn(docs, [1, 1, 1, -1, -1])
>>> judgments = [model.classify(d) for d in docs]
>>> print model.plane, model.bias

Building from source

Building requires Cython to be installed. Type

$ python setup.py build
$ python setup.py install

in the root directory to build and install.

License

The original svmlight code is included in the lib directory for ease of building. This code is Copyright (c) 2002 Thorsten Joachims - All rights reserved.

The cython code in the src directory is released under the MIT license:

Copyright (c) 2012 Daoud Clarke

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.