This is the vowpal wabbit fast online learning code. It is Copyright (c) 2009 Yahoo! Inc, and released for use under the BSD (revised) open source license. You can download the latest version from here: https://github.com/JohnLangford/vowpal_wabbit/archives/master Alternatively, the very latest version is available here: git clone git://github.com/JohnLangford/vowpal_wabbit.git You should be able to build it on most systems with: make (make test) (For Windows, look at README.windows.txt) If that fails, you try: ./autogen.sh ./configure make (make test) make install Note that ./autogen.sh requires automake. On OSX, this implies installing 'glibtools' Be sure to read the wiki: https://github.com/JohnLangford/vowpal_wabbit/wiki for the tutorial, command line options, etc. The 'cluster' directory has it's own documentation for cluster parallel use, and the examples at the end of test/Runtests give some example flags.