Add keras_metadata.pb to pre-trained models? #376
Description
Calamari built from current master (1c1b793) gives the following warning from the TensorFlow library:
$ calamari-predict --checkpoint fraktur_19th_century/4.ckpt --data.images test.png
[...]
WARNING 2025-12-24 11:06:05,448 tensorflow: SavedModel saved prior to TF 2.5 detected when loading Keras model. Please ensure that you are saving the model with model.save() or tf.keras.models.save_model(), *NOT* tf.saved_model.save(). To confirm, there should be a file named "keras_metadata.pb" in the SavedModel directory.
INFO 2025-12-24 11:06:08,588 absl: Fingerprint not found. Saved model loading will continue.
INFO 2025-12-24 11:06:08,588 absl: path_and_singleprint metric could not be logged. Saved model loading will continue.
The OCR system works fine, but I wanted to bring your attention to this warning. Missing keras_metadata.pb file in pre-trained models?