Using sentencepiece (EN-DE pretrained OpenNMT-py model)

Hi there,

I’m trying to use the pretrained English->German model (the very first one on I’m getting the exact same results described in this question: the translation is entirely unrelated to the input.

The answer in that case was to use sentencepiece to tokenize the text, and the model I downloaded did come with a sentencepiece.model file. My problem, though, is that I don’t know what to do with it. How do you actually run sentencepiece? Simply having the file in the same directory as the en-de model doesn’t seem to be enough, and if there’s a command you need to use, I haven’t found it yet. None of the links I’ve seen so far have helped, so I guess I need more detailed instructions than you’d expect.

Thanks for helping a beginner figure this thing out!

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I seem to have got it working. What I did was use the sentencepiece Python wrapper (, and instead of the provided test_model.model, simply use openNMT’s sentencepiece.model. It’s really pretty obvious in hindsight.

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