Difference between revisions of "How to bootstrap a new pair"
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If you had to add words to the monolingual dictionaries, you will have to type "make" in those directories first. Alternatively, there is a shortcut from the pair directory: "make langs" should make the monolingual dictionaries even if you're in the pair directory. |
If you had to add words to the monolingual dictionaries, you will have to type "make" in those directories first. Alternatively, there is a shortcut from the pair directory: "make langs" should make the monolingual dictionaries even if you're in the pair directory. |
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Another useful piece of information about "make langs": itʻs also possible to speed the process by "make -j8 langs", where 8 is replaced by number of CPU cores your computer has. |
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==Checking the tagger== |
==Checking the tagger== |
Latest revision as of 15:30, 20 April 2021
How to use apertium-init to bootstrap a new language pair (optionally with new monolingual data packages as well).
Prerequisites[edit]
You need to get this installed first:
- apertium/lttoolbox/hfst, see Installation, in particular the prerequisites parts. (You most likely don't need to go all the way, since you should get this stuff from Tino's repositories. If you're on Windows, get the Apertium VirtualBox.)
- apertium-init.py – put this script in your working directory where you will be downloading language data. You can get the script from https://apertium.org/apertium-init
Getting the monolingual packages[edit]
For each of the two languages of the pair, if it already exists, you can download and compile it by running
apertium-get XXX
Where XXX is the ISO 639-3 code of the language.
If the module doesn't exist (if it doesn't appear on this list or apertium-get can't find it) then you can create it like this:
# bootstrap the module python3 apertium-init.py XXX # enter the directory cd apertium-XXX # compile the module make -j
Bootstrapping the pair[edit]
In what follows, replace XXX and YYY for the ISO 639-3 codes of your languages:
Generate the pair:
python3 apertium-init.py XXX-YYY
Then compile the pair:
cd apertium-XXX-YYY ./autogen.sh --with-lang1=../apertium-XXX --with-lang2=../apertium-YYY make -j
And test:
echo house | apertium -d . XXX-YYY echo Haus | apertium -d . YYY-XXX
Now you can add words to apertium-XXX-YYY.XXX-YYY.dix, then test again:
make -j echo house | apertium -d . XXX-YYY echo Haus | apertium -d . YYY-XXX
If you had to add words to the monolingual dictionaries, you will have to type "make" in those directories first. Alternatively, there is a shortcut from the pair directory: "make langs" should make the monolingual dictionaries even if you're in the pair directory.
Another useful piece of information about "make langs": itʻs also possible to speed the process by "make -j8 langs", where 8 is replaced by number of CPU cores your computer has.
Checking the tagger[edit]
Unfortunately, apertium-tagger
will crash if given the wrong arguments. This will generally result in no output being produced when you try to translate something. Currently the best way to deal with this is to open the modes.xml
files in the two monolingual and checking what options they give in their XXX-tagger
and YYY-tagger
modes.
If you find -x
, -u 1
, -u 2
, or -u 3
after apertium-tagger
, add it to the corresponding line of the modes.xml
file in the bilingual directory.
If you just initialized the monolingual directory, add -u 2
in both places.
If the monolingual modes.xml
does not mention apertium-tagger
, bootstrap the pair again but add the argument --no-prob1
or --no-prob2
. If you have made changes that you don't want overwritten, add the argument --rebuild
as well, otherwise it will be simplest to delete the entire directory.
HFST and other alternative setups[edit]
If you're making a monolingual module that should use HFST/lexc, pass the option --analyser=hfst
to apertium-init.py.
If you're making a pair where the "left" side (XXX in the above examples) uses HFST/lexc, pass the option --analyser1=hfst
to apertium-init.py.
If you're making a pair where the "right" side (YYY in the above examples) uses HFST/lexc, pass the option --analyser2=hfst
to apertium-init.py.
If you're making a pair where the both sides use HFST/lexc, pass the option --analysers=hfst
to apertium-init.py.
See https://github.com/apertium/apertium-init for more documentation, or run ./apertium-init.py --help
for all options (you can e.g. also make pairs that don't use a statistical disambiguator, or don't use a Constraint Grammar disambiguator).
Choosing an Analyser[edit]
Monolingual dictionaries can be set up to use 1 of 3 available formats: monodix, lexc, and lexd.
Monodix is best for languages that have very little conjugation (such as English) or where the conjugation is entirely with suffixes but the stem doesn't change (such as Spanish). Monodix is the default setting for apertium-init or it can be explicitly specified with --analyser=lttoolbox
.
Lexc is best for languages where most of the conjugation is done with suffixes, potentially with some stem changes. Apertium-init will generate a Lexc dictionary with the option --analyser=hfst
.
Lexd should be used for any language with prefixes, infixes, circumfixes, or other morphology that isn't suffixes. Apertium-init will generate a Lexd dictionary with the option --analyser=lexd
.
If you're unsure which one to pick, Lexd will probably work well and generally involves less typing than either Monodix or Lexc.