Checkpoint file missing

Thank you for making your code available.
However, the following line fails when pointing to the model you provided.
`ckpt = tf.train.get_checkpoint_state(directories.checkpoints)`
> AttributeError: 'NoneType' object has no attribute 'model_checkpoint_path'

I believe this is because you did not include the checkpoint file. Can you please uploaded the full state?

Thank you!
