Aligning a corpus with fast align

What you need

• A sentence-aligned parallel corpus
• Fast_align (get it here)
• Two apertium language packages

Process

First analyse the corpus with the language packages.

$ cat /tmp/udhr.kaz | apertium-destxt | lt-proc -w ~/source/apertium/languages/apertium-kaz/kaz.automorf.bin | cg-proc -n -1 ~/source/apertium/languages/apertium-kaz/kaz.rlx.bin | apertium-retxt > /tmp/udhr.kaz.tagged
$ cat /tmp/udhr.kir | apertium-destxt | lt-proc -w ~/source/apertium/languages/apertium-kir/kir.automorf.bin | cg-proc -n -1 ~/source/apertium/languages/apertium-kir/kir.rlx.bin | apertium-retxt > /tmp/udhr.kir.tagged

Then remove superfluous tags (for example for lexical alignment, case is not really interesting).

cat /tmp/udhr.kaz.tagged | sed 's/\(<\(n\|adj\|adv\)>\)\(<[^>]\+>\)\+/\1/g' | sed 's/\(<v><tv>\|<v><iv>\)\(<[^>]\+>\)\+/\1/g' | apertium-pretransfer  > /tmp/udhr.kaz.trimmed
cat /tmp/udhr.kir.tagged | sed 's/\(<\(n\|adj\|adv\)>\)\(<[^>]\+>\)\+/\1/g' | sed 's/\(<v><tv>\|<v><iv>\)\(<[^>]\+>\)\+/\1/g' | apertium-pretransfer  > /tmp/udhr.kir.trimmed

Create the input file for fast_align:

$ paste /tmp/udhr.kaz.trimmed /tmp/udhr.kir.trimmed  | sed 's/ *\t */ ||| /g' > /tmp/udhr.kaz-kir.input

Run fast_align:

$ ./fast_align -d -v -o -i /tmp/udhr.kaz-kir.input > /tmp/udhr.kaz-kir.align

$ ./fast_align -d -v -o -r -i /tmp/udhr.kaz-kir.input > /tmp/udhr.kir-kaz.align

Symmetrise the alignments: