Can't reproduce machine translation bleu score
Hi, I'm trying to evaluate the [NMT En Fr Transformer12x2 model ](https://catalog.ngc.nvidia.com/orgs/nvidia/teams/nemo/models/nmt_en_fr_transformer12x2) with sacrebleu, and cannot reproduce the bleu score reported in the doc - reported WMT13 and WMT14 bleu scores are 35.3/41.3 and I got 31.1/36.1. Is there anything I'm missing? I did get the warning from sacrebleu about 
```
sacreBLEU: That's 100 lines that end in a tokenized period ('.')
sacreBLEU: It looks like you forgot to detokenize your test data, which may hurt your score.
sacreBLEU: If you insist your data is detokenized, or don't care, you can suppress this message with the `force` parameter.
```

Thank you.