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Install SystemDS
================

SystemDS can be installed via `pip` or installed from source.


Pip
---

Installation is quite simple with `pip`, just execute the following command::

  pip install systemds

SystemDS is a java-project, the `pip` package contains all the necessary `jars`,
but you will need java version 8 installed. Do not use an older or newer
version of java, because SystemDS is non compatible with other java versions.

Check the output of ``java -version``. The output should look similar to::

  openjdk version "1.8.0_242"
  OpenJDK Runtime Environment (build 1.8.0_242-b08)
  OpenJDK 64-Bit Server VM (build 25.242-b08, mixed mode)

The important part is in the first line ``openjdk version "1.8.0_xxx"``,
please make sure this is the case.


Source
------

To Install from source involves three steps.

Install Dependencies 

- `Maven <https://maven.apache.org/>`_ 
- `Python 3.6+ <https://www.python.org/downloads/>`_ and
- `OpenJDK 1.8 Java <https://openjdk.java.net/install/>`_

Once installed you please verify your version numbers. 
Additionally you have to install a few python packages.
Note depending on your installation you might need to use pip3 instead of pip::

  pip install numpy py4j wheel requests

Then to build the system you do the following

- Clone the Git Repository: https://github.com/apache/systemds.git
- Open an terminal at the root of the repository.
- Package the Java code using the ``mvn clean package -P distribution`` command
- ``cd src/main/python`` to point at the root of the SystemDS Python library.
- Build the Python API ``python create_python_dist.py``
- Install with ``pip install .``

After this you are ready to go.
