saved_model_cli show --dir resnet/1
saved_model_cli show --dir resnet/1 --tag_set serve
saved_model_cli show --dir resnet/1 --tag_set serve --signature_def serving_default
saved_model_cli run \
--dir resnet/1 \
--tag_set serve \
--signature_def serving_default \
--input_exprs 'input_1=np.random.rand(1,224,224,3)'