I trained a model in TensorFlow using the `tf.estimator` API, more specifically using `tf.estimator.train_and_evaluate`. I have the output directory of the training. How do I load my model from this and then use it?

I have tried using the `tf.train.Saver` class by loading the most recent `ckpt` file and restoring the session. However, then to call `sess.run()` I need to know what the name of the output node of the graph is so I can pass this to the `fetches` argument. What is the name/how can I access this output node? Is there a better way to load and use the trained model?

Note that I have already trained and saved the model in a `ckpt` file, so please do not suggest that I use the `simple_save` function.