Deep Speech 2

I am using Deep Speech 2 : https://github.com/tensorflow/models/tree/master/research/deep_speech
How can I export the model and use it for prediction ?
I have the next files :

checkpoint
graph.pbtxt
model.ckpt-xxxx.data-00000-of-00001
model.ckpt-xxxx.meta
model.ckpt-xxxx.index

This is not our model, we can’t help you.