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Language packs are pre-built translation models with an included instance of the Joshua runtime environment. A key feature is that there are no dependencies (apart from Java 8). Getting a machine translation system running on your own machine is as easy as downloading the tarball, unpacking it, and running the included shell script.

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Using Language Packs

Once you download the model, unpack it. The simplest use-case is then to run Joshua as a standard UNIX tool, accepting a single line of input and writing a single line of output. Assuming your language pack is downloaded to "apache-joshua-language-pack.tgz":

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• "-m XXg" — increase the amount of memory provided to Joshua. The default is 8g, but for the larger language packs, you will want 16 or 24. In general, 50% more memory than the raw model size should be more than sufficient.
• "-top-n N" — output up to N translation candidates, instead of just one.
• "-output-format STRING" — change the output format. By default, Joshua outputs just the single, tokenized translation with the highest model probability. 
  Here are some other options:
  • %s: the raw translated string
  • %S: the detokenized translated string
  • %e: the source string
  • %i: the sequence number (0-indexed)
  • %c: the model score
  • %f: the feature string
  These can all be combined in a single string, e.g., -output-format "%i ||| %s ||| %f ||| %c"

Versions

The language pack version history:

Citation

Please cite the following paper if you use Joshua in your research.

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