CUNI Systems in WMT21: Revisiting Backtranslation Techniques for English-Czech NMT

Abstract

We describe our two NMT systems submitted to the WMT2021 shared task in English-Czech news translation: CUNI-DocTransformer (document-level CUBBITT) and CUNI-Marian-Baselines. We improve the former with a better sentence-segmentation pre-processing and a post-processing for fixing errors in numbers and units.

We use the latter for experiments with various backtranslation techniques.

Keywords

• cuni
• systems
• wmt21
• revisiting
• backtranslation
• techniques
• english
• czech