FNN_XOR_Tensorflow_tensorbard_graph_only.py contains no program in the traditional sense. It contains an essential aspect of developing machine learning and neural networks: the architecture. This program is overloaded with basic graph summaries to grasp the core concept of the data flow graph. In subsequent programs in this book, the summaries will be less literal.
Master the architecture of a machine learning and deep learning program and you'll master your solutions.