The Helsinki Neural Machine Translation System\ThanksThe software is available from https://github.com/robertostling/hnmt under the GNU General Public License version 3.
Table 1: Backtranslated Finnish news data.
['[EMPTY]', 'sentences', 'Finnish', 'English']
In our experiments, we used all English–Finnish parallel data sets provided by WMT except the Wiki headlines, which is a small and rather noisy data set that did not contribute anything in our experiments from last year. We also added substantial amounts of backtranslated data that has been shown to help especially in neural machine translation in statistical MT that uses a factored model with multiple translation paths, morphological tags and pseudo-tokens for case-markers that correspond to English prepositions The system scored 20.5% lowercased BLEU on the newstest 2016 data, which was the second-best system for the task in 2016.