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Scripts/utils/format_lm.sh
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#!/bin/bash -u # Copyright 2012 Arnab Ghoshal # Copyright 2010-2011 Microsoft Corporation # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY # KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED # WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, # MERCHANTABLITY OR NON-INFRINGEMENT. # See the Apache 2 License for the specific language governing permissions and # limitations under the License. set -o errexit if [ $# -ne 4 ]; then printf "Usage: %s lang_dir LM lexicon out_dir " `basename $0` echo " Convert ARPA-format language models to FSTs."; exit 1; fi lang_dir=$1 lm=$2 lexicon=$3 out_dir=$4 mkdir -p $out_dir [ -f ./path.sh ] && . ./path.sh echo "Converting '$lm' to FST" for f in phones.txt words.txt L.fst L_disambig.fst phones/; do cp -r $lang_dir/$f $out_dir done lm_base=$(basename $lm '.gz') gunzip -c $lm | utils/find_arpa_oovs.pl $out_dir/words.txt \ > $out_dir/oovs_${lm_base}.txt # Removing all "illegal" combinations of <s> and </s>, which are supposed to # occur only at being/end of utt. These can cause determinization failures # of CLG [ends up being epsilon cycles]. gunzip -c $lm \ | egrep -v '<s> <s>|</s> <s>|</s> </s>' \ | arpa2fst - | fstprint \ | utils/remove_oovs.pl $out_dir/oovs_${lm_base}.txt \ | utils/eps2disambig.pl | utils/s2eps.pl \ | fstcompile --isymbols=$out_dir/words.txt --osymbols=$out_dir/words.txt \ --keep_isymbols=false --keep_osymbols=false \ | fstrmepsilon > $out_dir/G.fst set +e fstisstochastic $out_dir/G.fst set -e # The output is like: # 9.14233e-05 -0.259833 # we do expect the first of these 2 numbers to be close to zero (the second is # nonzero because the backoff weights make the states sum to >1). # Everything below is only for diagnostic. # Checking that G has no cycles with empty words on them (e.g. <s>, </s>); # this might cause determinization failure of CLG. # #0 is treated as an empty word. mkdir -p $out_dir/tmpdir.g awk '{if(NF==1){ printf("0 0 %s %s ", $1,$1); }} END{print "0 0 #0 #0"; print "0";}' \ < "$lexicon" > $out_dir/tmpdir.g/select_empty.fst.txt fstcompile --isymbols=$out_dir/words.txt --osymbols=$out_dir/words.txt \ $out_dir/tmpdir.g/select_empty.fst.txt \ | fstarcsort --sort_type=olabel \ | fstcompose - $out_dir/G.fst > $out_dir/tmpdir.g/empty_words.fst fstinfo $out_dir/tmpdir.g/empty_words.fst | grep cyclic | grep -w 'y' \ && echo "Language model has cycles with empty words" && exit 1 rm -r $out_dir/tmpdir.g echo "Succeeded in formatting LM: '$lm'" |