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#!/bin/bash -v
# this sample script preprocesses a sample corpus, including tokenization,
# truecasing, and subword segmentation.
# for application to a different language pair,
# change source and target prefix, optionally the number of BPE operations,
# and the file names (currently, data/corpus and data/newsdev2016 are being processed)
# in the tokenization step, you will want to remove Romanian-specific normalization / diacritic removal,
# and you may want to add your own.
# also, you may want to learn BPE segmentations separately for each language,
# especially if they differ in their alphabet
# suffix of source language files
SRC=ro
# suffix of target language files
TRG=en
# number of merge operations. Network vocabulary should be slightly larger (to include characters),
# or smaller if the operations are learned on the joint vocabulary
bpe_operations=60000
# path to moses decoder: https://github.com/moses-smt/mosesdecoder
mosesdecoder=mosesdecoder
# path to subword segmentation scripts: https://github.com/rsennrich/subword-nmt
subword_nmt=subword-nmt
# tokenize
for prefix in corpus newsdev2016
do
cat data/$prefix.$SRC | \
$mosesdecoder/scripts/tokenizer/normalize-punctuation.perl -l $SRC | \
./scripts/normalise-romanian.py | \
./scripts/remove-diacritics.py | \
$mosesdecoder/scripts/tokenizer/tokenizer.perl -a -l $SRC > data/$prefix.tok.$SRC
cat data/$prefix.$TRG | \
$mosesdecoder/scripts/tokenizer/normalize-punctuation.perl -l $TRG | \
$mosesdecoder/scripts/tokenizer/tokenizer.perl -a -l $TRG > data/$prefix.tok.$TRG
done
# clean empty and long sentences, and sentences with high source-target ratio (training corpus only)
$mosesdecoder/scripts/training/clean-corpus-n.perl data/corpus.tok $SRC $TRG data/corpus.tok.clean 1 80
# train truecaser
$mosesdecoder/scripts/recaser/train-truecaser.perl -corpus data/corpus.tok.clean.$SRC -model model/truecase-model.$SRC
$mosesdecoder/scripts/recaser/train-truecaser.perl -corpus data/corpus.tok.clean.$TRG -model model/truecase-model.$TRG
# apply truecaser (cleaned training corpus)
for prefix in corpus
do
$mosesdecoder/scripts/recaser/truecase.perl -model model/truecase-model.$SRC < data/$prefix.tok.clean.$SRC > data/$prefix.tc.$SRC
$mosesdecoder/scripts/recaser/truecase.perl -model model/truecase-model.$TRG < data/$prefix.tok.clean.$TRG > data/$prefix.tc.$TRG
done
# apply truecaser (dev/test files)
for prefix in newsdev2016
do
$mosesdecoder/scripts/recaser/truecase.perl -model model/truecase-model.$SRC < data/$prefix.tok.$SRC > data/$prefix.tc.$SRC
$mosesdecoder/scripts/recaser/truecase.perl -model model/truecase-model.$TRG < data/$prefix.tok.$TRG > data/$prefix.tc.$TRG
done
# train BPE
cat data/corpus.tc.$SRC data/corpus.tc.$TRG | $subword_nmt/learn_bpe.py -s $bpe_operations > model/$SRC$TRG.bpe
# apply BPE
for prefix in corpus newsdev2016
do
$subword_nmt/apply_bpe.py -c model/$SRC$TRG.bpe < data/$prefix.tc.$SRC > data/$prefix.bpe.$SRC
$subword_nmt/apply_bpe.py -c model/$SRC$TRG.bpe < data/$prefix.tc.$TRG > data/$prefix.bpe.$TRG
done
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