def _build_tf_graph(self):
"""Build the TF graph, setup model saving and setup a TF session.
Notes
-----
This method initializes a TF Saver and a TF Session via
```python
self._saver = tf.train.Saver()
self._session = tf.Session()
These calls are made after `self._set_up_graph()`` is called.
See the main class docs for how to properly call this method from a
child class.
"""
self._set_up_graph()
self._saver = tf.train.Saver()
self._session = tf.Session()```
