How to setup Textsum for TensorFlow serving - tensorflow

Question

I am trying to setup the decode functionality of textsum using tensorflow serving but I haven't been able fully make sense of what is fully necessary to perform via the MNIST tutorial. Has anyone come across any other tutorials on setting up Tensorflow serving models or even something more aligned to textsum? Any help or direction would be great. Thanks!
In the end I am trying to export the decode functionality from a model trained via 'train' in seq2seq_attention.py found here: https://github.com/tensorflow/models/blob/master/textsum/seq2seq_attention.py
When comparing the below 2 files to make sense of what I need to perform to the above textsum model, I am having difficulty in making sense of what needs to be assigned in the "default_graph_signature, input tensor, classes_tensor, etc" I realize that these may not be aligned with the textsum model,however this is what I am trying to clear up and figured perhaps if I saw some other models that were being exported to tensorflow serving, that it may perhaps make a bit more sense.
Comapred:
https://github.com/tensorflow/tensorflow/blob/r0.11/tensorflow/examples/tutorials/mnist/mnist_softmax.py
and
https://github.com/tensorflow/serving/blob/master/tensorflow_serving/example/mnist_export.py
------------------ Edit -------------------
Below is what I have so far but I am having a few issues. I am trying to setup the Textsum Eval functionality for serving. First I am getting an error stating "no variables to save" when the assignment of Saver(sharded=True) occurs. That aside, I also don't understand what I am supposed to assign to the "classification_signature" and the "named_graph_signature" variables for the exporting of the results via textsum decode.
Any help on what I'm missing here...sure it is a bit.
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import sys
import tensorflow as tf
from tensorflow.contrib.session_bundle import exporter
tf.app.flags.DEFINE_string("export_dir", "exports/textsum",
"Directory where to export textsum model.")
tf.app.flags.DEFINE_string('checkpoint_dir', 'log_root',
"Directory where to read training checkpoints.")
tf.app.flags.DEFINE_integer('export_version', 1, 'version number of the model.')
tf.app.flags.DEFINE_bool("use_checkpoint_v2", False,
"If true, write v2 checkpoint files.")
FLAGS = tf.app.flags.FLAGS
def Export():
try:
saver = tf.train.Saver(sharded=True)
with tf.Session() as sess:
# Restore variables from training checkpoints.
ckpt = tf.train.get_checkpoint_state(FLAGS.checkpoint_dir)
if ckpt and ckpt.model_checkpoint_path:
saver.restore(sess, ckpt.model_checkpoint_path)
global_step = ckpt.model_checkpoint_path.split('/')[-1].split('-')[-1]
print('Successfully loaded model from %s at step=%s.' %
(ckpt.model_checkpoint_path, global_step))
else:
print('No checkpoint file found at %s' % FLAGS.checkpoint_dir)
return
# Export model
print('Exporting trained model to %s' % FLAGS.export_dir)
init_op = tf.group(tf.initialize_all_tables(), name='init_op')
model_exporter = exporter.Exporter(saver)
classification_signature = <-- Unsure what should be assigned here
named_graph_signature = <-- Unsure what should be assigned here
model_exporter.init(
init_op=init_op,
default_graph_signature=classification_signature,
named_graph_signatures=named_graph_signature)
model_exporter.export(FLAGS.export_dir, tf.constant(global_step), sess)
print('Successfully exported model to %s' % FLAGS.export_dir)
except:
err = sys.exc_info()
print ('Unexpected error:', err[0], ' - ', err[1])
pass
def main(_):
Export()
if __name__ == "__main__":
tf.app.run()