Trying to restore model, but tf.train.import_meta_graph(meta_path) raises error

I recently also met such a problem. It seems like the reason is that the TensorFlow version you use to train the model is different from the version you use to read the graph description proto. What you need to do is to reinstall the TensorFlow to your training version. Otherwise, retraining the model would work.

FYI, the TensorFlow version I used to train is 1.12.0, by contrast, the version I use to load the graph is 1.13.1. Reinstallation solves the problem.