Additional setup

Additional setup is required to include libraries required for text processing. Take a look at the following points:

1. First is Bazel. On Ubuntu, you will need to follow the official tutorial on this link to install Bazel. https://docs.bazel.build/versions/master/install-ubuntu.html. On macOS, you can use HomeBrew to install bazel as follows:

      $ brew install bazel

2. Then, we will install swig, which will allow us to wrap C/C++ functions to allow calls in Python. On Ubuntu, you can install it using:

      $ sudo apt-get install swig

On Mac OS, we will also install it using brew, as follows:

      $ brew install swig

3. Next, we'll install the protocol buffer support, which will allow us to store and retrieve serialized data in a more efficient manner than with XML. We specifically need version 3.3.0 to install it as follows:

      $ pip install -U protobuf...