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90 lines
3.7 KiB
90 lines
3.7 KiB
#!/bin/bash
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# Copyright 2015 Yajie Miao (Carnegie Mellon University)
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
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# WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
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# MERCHANTABLITY OR NON-INFRINGEMENT.
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# See the Apache 2 License for the specific language governing permissions and
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# limitations under the License.
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# This script compiles the lexicon and CTC tokens into FSTs. FST compiling slightly differs between the
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# phoneme and character-based lexicons.
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set -eo pipefail
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. utils/parse_options.sh
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if [ $# -ne 3 ]; then
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echo "usage: utils/fst/compile_lexicon_token_fst.sh <dict-src-dir> <tmp-dir> <lang-dir>"
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echo "e.g.: utils/fst/compile_lexicon_token_fst.sh data/local/dict data/local/lang_tmp data/lang"
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echo "<dict-src-dir> should contain the following files:"
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echo "lexicon.txt lexicon_numbers.txt units.txt"
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echo "options: "
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exit 1;
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fi
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srcdir=$1
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tmpdir=$2
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dir=$3
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mkdir -p $dir $tmpdir
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[ -f path.sh ] && . ./path.sh
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cp $srcdir/units.txt $dir
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# Add probabilities to lexicon entries. There is in fact no point of doing this here since all the entries have 1.0.
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# But utils/make_lexicon_fst.pl requires a probabilistic version, so we just leave it as it is.
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perl -ape 's/(\S+\s+)(.+)/${1}1.0\t$2/;' < $srcdir/lexicon.txt > $tmpdir/lexiconp.txt || exit 1;
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# Add disambiguation symbols to the lexicon. This is necessary for determinizing the composition of L.fst and G.fst.
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# Without these symbols, determinization will fail.
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# default first disambiguation is #1
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ndisambig=`utils/fst/add_lex_disambig.pl $tmpdir/lexiconp.txt $tmpdir/lexiconp_disambig.txt`
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# add #0 (#0 reserved for symbol in grammar).
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ndisambig=$[$ndisambig+1];
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( for n in `seq 0 $ndisambig`; do echo '#'$n; done ) > $tmpdir/disambig.list
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# Get the full list of CTC tokens used in FST. These tokens include <eps>, the blank <blk>,
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# the actual model unit, and the disambiguation symbols.
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cat $srcdir/units.txt | awk '{print $1}' > $tmpdir/units.list
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(echo '<eps>';) | cat - $tmpdir/units.list $tmpdir/disambig.list | awk '{print $1 " " (NR-1)}' > $dir/tokens.txt
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# ctc_token_fst_corrected is too big and too slow for character based chinese modeling,
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# so here just use simple ctc_token_fst
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utils/fst/ctc_token_fst.py --token_file $dir/tokens.txt | \
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fstcompile --isymbols=$dir/tokens.txt --osymbols=$dir/tokens.txt --keep_isymbols=false --keep_osymbols=false | \
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fstarcsort --sort_type=olabel > $dir/T.fst || exit 1;
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# Encode the words with indices. Will be used in lexicon and language model FST compiling.
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cat $tmpdir/lexiconp.txt | awk '{print $1}' | sort | awk '
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BEGIN {
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print "<eps> 0";
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}
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{
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printf("%s %d\n", $1, NR);
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}
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END {
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printf("#0 %d\n", NR+1);
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printf("<s> %d\n", NR+2);
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printf("</s> %d\n", NR+3);
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printf("ROOT %d\n", NR+4);
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}' > $dir/words.txt || exit 1;
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# Now compile the lexicon FST. Depending on the size of your lexicon, it may take some time.
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token_disambig_symbol=`grep \#0 $dir/tokens.txt | awk '{print $2}'`
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word_disambig_symbol=`grep \#0 $dir/words.txt | awk '{print $2}'`
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utils/fst/make_lexicon_fst.pl --pron-probs $tmpdir/lexiconp_disambig.txt 0 "sil" '#'$ndisambig | \
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fstcompile --isymbols=$dir/tokens.txt --osymbols=$dir/words.txt \
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--keep_isymbols=false --keep_osymbols=false | \
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fstaddselfloops "echo $token_disambig_symbol |" "echo $word_disambig_symbol |" | \
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fstarcsort --sort_type=olabel > $dir/L.fst || exit 1;
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echo "Lexicon and Token FSTs compiling succeeded"
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