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/*
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.
 */

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

These prerequisites are usually pre-installed on many platforms. However, you may need to consult your favorite package manager (yum, apt, MacPorts, brew, ...) to install missing software.

• Boost library, with the Boost::Program_Options library option enabled.
• GNU autotools: autoconf, automake, libtool, autoheader, et. al.
• (optional) git if you want to check out the latest version of vowpal wabbit, work on the code, or even contribute code to the main project.

You can download the latest version from here. The very latest version is always available via 'github' by invoking one of the following:

## For the traditional ssh-based Git interaction:
$ git clone git://github.com/JohnLangford/vowpal_wabbit.git

## For HTTP-based Git interaction
$ git clone https://github.com/JohnLangford/vowpal_wabbit.git

You should be able to build the vowpal wabbit on most systems with:

$ make
$ make test    # (optional)

If that fails, try:

$ ./autogen.sh
$ make
$ make test    # (optional)
$ make install

Note that ./autogen.sh requires automake (see the prerequisites, above.)

./autogen.sh's command line arguments are passed directly to configure as if they were configure arguments and flags.

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.

The default C++ compiler optimization flags are very aggressive. If you should run into a problem, consider running configure with the --enable-debug option, e.g.:

$ ./configure --enable-debug

or passing your own compiler flags via the CXXOPTIMIZE make variable:

$ make CXXOPTIMIZE="-O0 -g"

OSX requires glibtools, which is available via the brew or MacPorts package managers.

brew install vowpal-wabbit

The homebrew formula for VW is located on github.

brew install libtool
brew install boost --with-python

## Install glibtool and other GNU autotool friends:
$ port install libtool autoconf automake

## Build Boost for Mac OS X 10.8 and below
$ port install boost +no_single +no_static +openmpi +python27 configure.cxx_stdlib=libc++ configure.cxx=clang++

## Build Boost for Mac OS X 10.9 and above
$ port install boost +no_single +no_static +openmpi +python27

Mac OS X 10.8 and below: configure.cxx_stdlib=libc++ and configure.cxx=clang++ ensure that clang++ uses the correct C++11 functionality while building Boost. Ordinarily, clang++ relies on the older GNU g++ 4.2 series header files and stdc++ library; libc++ is the clang replacement that provides newer C++11 functionality. If these flags aren't present, you will likely encounter compilation errors when compiling vowpalrabbit/cbify.cc. These error messages generally contain complaints about std::to_string and std::unique_ptr types missing.

To compile:

$ sh autogen.sh --enable-libc++
$ make
$ make test    # (optional)