.. _install_ubuntu:

Easy Installation of an optimized Theano on Ubuntu
==================================================

These instruction was done for Ubuntu 11.04, 11.10 and 12.04. You can
probably do something similar on older computer.

.. note::

    It is possible to have a faster installation of Theano than the one these
    instructions will provide, but this will make the installation more
    complicated and/or may require that you buy software. This is a simple set
    of installation instructions that will leave you with a relatively
    well-optimized version that uses only free software. With more work or by
    investing money (i.e. buying a license to a proprietary BLAS
    implementation), it is possible to gain further performance.

.. note::

   If you are behind a proxy, you must do some extra configuration steps
   before starting the installation. You must set the environment
   variable ``http_proxy`` to the proxy address. Using bash this is
   accomplished with the command
   ``export http_proxy="http://user:pass@my.site:port/"``
   You can also provide the ``--proxy=[user:pass@]url:port`` parameter
   to pip. The ``[user:pass@]`` portion is optional.

.. note::

   We use ``pip`` for 2 reasons. First, it allows "``import module;
   module.test()``" to work correctly. Second, the installation of NumPy
   1.6 or 1.6.1 with ``easy_install`` raises an ImportError at the end of
   the installation. To my knowledge we can ignore this error, but
   this is not completely safe. ``easy_install`` with NumPy 1.5.1 does not
   raise this error.


Installation steps
~~~~~~~~~~~~~~~~~~

Ubuntu 11.10/12.04/12.10:
 1) ``sudo apt-get install python-numpy python-scipy python-dev python-pip python-nose g++ libopenblas-dev git``
 2) ``sudo pip install Theano``

Ubuntu 11.04:
 1) ``sudo apt-get install python-numpy python-scipy python-dev python-pip python-nose g++ git libatlas3gf-base libatlas-dev``
 2) ``sudo pip install Theano``



Test the newly installed packages
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 1) NumPy (~30s): ``python -c "import numpy; numpy.test()"``
 2) SciPy (~1m): ``python -c "import scipy; scipy.test()"``
 3) Theano (~30m): ``python -c "import theano; theano.test()"``


Speed test Theano/BLAS
~~~~~~~~~~~~~~~~~~~~~~

It is recommended to test your Theano/BLAS integration. There are many versions
of BLAS that exist and there can be up to 10x speed difference between them.
Also, having Theano link directly against BLAS instead of using NumPy/SciPy as
an intermediate layer reduces the computational overhead. This is
important for BLAS calls to ``ger``, ``gemv`` and small ``gemm`` operations
(automatically called when needed when you use ``dot()``). To run the
Theano/BLAS speed test:

.. code-block:: bash

    python `python -c "import os, theano; print os.path.dirname(theano.__file__)"`/misc/check_blas.py

This will print a table with different versions of BLAS/numbers of
threads on multiple CPUs and GPUs. It will also print some Theano/NumPy
configuration information. Then, it will print the running time of the same
benchmarks for your installation. Try to find a CPU similar to yours in
the table, and check that the single-threaded timings are roughly the same.

Theano should link to a parallel version of Blas and use all cores
when possible. By default it should use all cores. Set the environment
variable "OMP_NUM_THREADS=N" to specify to use N threads.


Updating Theano
~~~~~~~~~~~~~~~

If you followed these installation instructions, you can execute this command
to update only Theano:

.. code-block:: bash

    sudo pip install --upgrade --no-deps theano


If you want to also installed NumPy/SciPy with pip instead of the
system package, you can run this:

.. code-block:: bash

    sudo pip install --upgrade theano


Bleeding edge
~~~~~~~~~~~~~

Do like in the section "Updating Theano", but use
``git+git://github.com/Theano/Theano.git`` instead of ``theano``.


Contributed GPU instruction
~~~~~~~~~~~~~~~~~~~~~~~~~~~

Basic configuration for the GPU :ref:`gpu_linux`.

Ubuntu 11.10/12.04 (probably work on 11.04 too):

.. code-block:: bash

   sudo apt-add-repository ppa:ubuntu-x-swat/x-updates
   sudo apt-get update
   sudo apt-get install nvidia-current

Then you need to fetch latest CUDA tool kit (download ubuntu 11.04 32/64bit package)
from `here <http://developer.nvidia.com/cuda-downloads>`_.

Then you install it like this:

.. code-block:: bash

    chmod a+x XXX.sh
    sudo ./XXX.sh

You probably need to change the default version of gcc as 
`explained by Benjamin J. McCann <http://www.benmccann.com/dev-blog/installing-cuda-and-theano/>`_:




.. code-block:: bash

   sudo apt-get install nvidia-cuda-toolkit g++-4.4 gcc-4.4
   # On Ubuntu 11.10 and 12.04, you probably need to change gcc-4.5 to gcc-4.6 on the next line.
   sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.5 40 --slave /usr/bin/g++ g++ /usr/bin/g++-4.5
   sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.4 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.4
   sudo update-alternatives --config gcc

Test GPU configuration
~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: bash

    THEANO_FLAGS=floatX=float32,device=gpu python /usr/lib/python2.*/site-packages/theano/misc/check_blas.py

.. note::

   Ubuntu 10.04 LTS: default gcc version 4.4.3. gcc 4.1.2, 4.3.4 availables.

   Ubuntu 11.04: default gcc version 4.5.2. gcc 4.4.5 availables.

   Ubuntu 11.10: default gcc version 4.6.1. gcc 4.4.6 and 4.5.3 availables.

   Ubuntu 12.04 LTS: default gcc version 4.6.3. gcc 4.4.7 and 4.5.3 availables.

   Ubuntu 12.10: default gcc version 4.7.2. gcc 4.4.7, 4.5.4 and 4.6.3 availables.













