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John Langford's original release of Vowpal Wabbit -- a fast online learning algorithm

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Octocat-spinner-32 acinclude.d removed auto generated build output January 10, 2012
Octocat-spinner-32 c_test fix more v120 issues March 21, 2014
Octocat-spinner-32 cluster perform close() after shutdown() in spanning_tree April 14, 2014
Octocat-spinner-32 cs_test initial cbify and a bugfix December 24, 2013
Octocat-spinner-32 demo demo tweaks January 02, 2014
Octocat-spinner-32 library change stride to stride_shift April 16, 2014
Octocat-spinner-32 test propagate error correction to tests April 01, 2014
Octocat-spinner-32 utl vw-csv2bin util: allow negative #'s and #'s in scientific notation March 25, 2014
Octocat-spinner-32 vowpalwabbit Merge branch 'master' of April 16, 2014
Octocat-spinner-32 .gitignore ignore binaries in library/ December 27, 2013
Octocat-spinner-32 .gitkeep first commit to releases branch February 04, 2012
Octocat-spinner-32 .travis.yml add back -all-dev December 28, 2012
Octocat-spinner-32 AUTHORS Update: many new names since last time this was changed January 05, 2014
Octocat-spinner-32 ChangeLog converted to use autotools December 27, 2011
Octocat-spinner-32 INSTALL README -> December 18, 2013
Octocat-spinner-32 LICENSE adjust licensing stuff to the current world September 28, 2012
Octocat-spinner-32 Makefile use the more standard LDFLAGS Makefile idiom for static linking April 06, 2014
Octocat-spinner-32 error check all calls to calloc March 31, 2014
Octocat-spinner-32 NEWS converted to use autotools December 27, 2011
Octocat-spinner-32 some markdown December 18, 2013
Octocat-spinner-32 added missing files September 24, 2013
Octocat-spinner-32 Fix AC_PATH on mac os x with homebrew March 04, 2014
Octocat-spinner-32 update to 7.6.1 April 11, 2014
Octocat-spinner-32 updated February 04, 2012
Copyright (c) by respective owners including Yahoo!, Microsoft, and
individual contributors. All rights reserved.  Released under a BSD (revised)
license as described in the file LICENSE.

Build Status

This is the vowpal wabbit fast online learning code. For Windows, look at

You can download the latest version from here:

Alternatively, the very latest version is available here:

git clone git://

You should be able to build it on most systems with: make (make test)

If that fails, try:

(make test)
make install

Note that ./ requires automake. On OSX, this implies installing 'glibtools'

Be sure to read the 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.

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