simple serving resource: https://medium.com/epigramai/tensorflow-serving-101-pt-1-a79726f7c103
simple client resource: https://github.com/tensorflow/serving/blob/master/tensorflow_serving/example/mnist_client.py
iris client resource: https://gist.github.com/ismaeIfm/eeb24fad2623dfb69ca81bb0f254543f