OpenNMT-tf 2.13.0

New features

• [API] opennmt.Encoder now accepts tf.RaggedTensor as input
• [API] opennmt.Runner.train can return a summary of the training (e.g. average loss, last step, etc.)
• [API] Add function opennmt.data.create_lookup_tables to create tf.lookup tables from a vocabulary file

Fixes and improvements

• Raise errors (not warnings) when starting the training but end conditions are met
• Ignore non training time when computing training throughput: ignore initialization, evaluation, and checkpoint saving
• Print OpenNMT-tf version in the training logs
• Improve error message when model.initialize() is not called