OpenNMT-tf 2.9.0

New features

• Horovod support with the training flag --horovod
• New external scorers:
  • wer: Word Error Rate
  • ter: Translation Error Rate
  • prf: Precision, Recall, and F-Measure
• Evaluation parameter max_exports_to_keep to limit the number of exported models

Fixes and improvements

• Do not report "target words/s" when training language models