#!/bin/bash
  
  # This script builds a larger word-list and dictionary 
  # than used for the LMs supplied with the WSJ corpus.
  # It uses a couple of strategies to fill-in words in
  # the LM training data but not in CMUdict.  One is
  # to generate special prons for possible acronyms, that
  # just consist of the constituent letters.  The other
  # is designed to handle derivatives of known words
  # (e.g. deriving the pron of a plural from the pron of
  # the base-word), but in a more general, learned-from-data
  # way.
  # It makes use of scripts in local/dict/
  
  dict_suffix=
  
  echo "$0 $@"  # Print the command line for logging
  . utils/parse_options.sh || exit 1;
  
  if [ $# -ne 1 ]; then
    echo "Usage: local/cstr_wsj_train_lms.sh WSJ1_doc_dir"
    exit 1
  fi
  
  export PATH=$PATH:`pwd`/local/dict/
  srcdir=$1
  
  if [ ! -d $srcdir/lng_modl ]; then
    echo "Expecting 'lng_modl' under WSJ doc directory '$srcdir'"
    exit 1
  fi
  
  mkdir -p data/local/dict${dict_suffix}_larger
  dir=data/local/dict${dict_suffix}_larger
  cp data/local/dict${dict_suffix}/* data/local/dict${dict_suffix}_larger # Various files describing phones etc.
    # are there; we just want to copy them as the phoneset is the same.
  rm data/local/dict${dict_suffix}_larger/lexicon.txt # we don't want this.
  rm data/local/dict${dict_suffix}_larger/lexiconp.txt # we don't want this either.
  mincount=2 # Minimum count of an OOV we will try to generate a pron for.
  
  [ ! -f data/local/dict${dict_suffix}/cmudict/cmudict.0.7a ] && echo "CMU dict not in expected place" && exit 1;
  
  # Remove comments from cmudict; print first field; remove
  # words like FOO(1) which are alternate prons: our dict format won't
  # include these markers.
  grep -v ';;;' data/local/dict${dict_suffix}/cmudict/cmudict.0.7a | 
   perl -ane 's/^(\S+)\(\d+\)/$1/; print; ' | sort | uniq > $dir/dict.cmu
  
  cat $dir/dict.cmu | awk '{print $1}' | sort | uniq > $dir/wordlist.cmu
  
  echo "Getting training data [this should take at least a few seconds; if not, there's a problem]"
  
  # Convert to uppercase, remove XML-like markings.
  # For words ending in "." that are not in CMUdict, we assume that these
  # are periods that somehow remained in the data during data preparation,
  # and we we replace the "." with "
  ".  Note: we found this by looking at
  # oov.counts below (before adding this rule).
  
  touch $dir/cleaned.gz
  if [ `du -m $dir/cleaned.gz | cut -f 1` -eq 73 ]; then
    echo "Not getting cleaned data in $dir/cleaned.gz again [already exists]";
  else
   gunzip -c $srcdir/lng_modl/lm_train/np_data/{87,88,89}/*.z \
    | awk '/^</{next}{print toupper($0)}' | perl -e '
     open(F, "<$ARGV[0]")||die;
     while(<F>){ chop; $isword{$_} = 1; }
     while(<STDIN>) { 
      @A = split(" ", $_); 
      for ($n = 0; $n < @A; $n++) {
        $a = $A[$n];
        if (! $isword{$a} && $a =~ s/^([^\.]+)\.$/$1/) { # nonwords that end in "."
           # and have no other "." in them: treat as period.
           print "$a";
           if ($n+1 < @A) { print "
  "; }
        } else { print "$a "; }
      }
      print "
  ";
    }
   ' $dir/wordlist.cmu | gzip -c > $dir/cleaned.gz
  fi
    
  # get unigram counts
  echo "Getting unigram counts"
  gunzip -c $dir/cleaned.gz | tr -s ' ' '
  ' | \
    awk '{count[$1]++} END{for (w in count) { print count[w], w; }}' | sort -nr > $dir/unigrams
  
  cat $dir/unigrams | awk -v dict=$dir/dict.cmu \
    'BEGIN{while(getline<dict) seen[$1]=1;} {if(!seen[$2]){print;}}' \
     > $dir/oov.counts
  
  echo "Most frequent unseen unigrams are: "
  head $dir/oov.counts
  
  # Prune away singleton counts, and remove things with numbers in
  # (which should have been normalized) and with no letters at all.
  
  
  cat $dir/oov.counts | awk -v thresh=$mincount '{if ($1 >= thresh) { print $2; }}' \
    | awk '/[0-9]/{next;} /[A-Z]/{print;}' > $dir/oovlist
  
  # Automatic rule-finding...
  
  # First make some prons for possible acronyms.
  # Note: we don't do this for things like U.K or U.N,
  # or A.B. (which doesn't exist anyway), 
  # as we consider this normalization/spelling errors.
  
  cat $dir/oovlist | local/dict/get_acronym_prons.pl $dir/dict.cmu  > $dir/dict.acronyms
  
  mkdir $dir/f $dir/b # forward, backward directions of rules...
    # forward is normal suffix
    # rules, backward is reversed (prefix rules).  These
    # dirs contain stuff we create while making the rule-based
    # extensions to the dictionary.
  
  # Remove ; and , from words, if they are present; these
  # might crash our scripts, as they are used as separators there.
  filter_dict.pl $dir/dict.cmu > $dir/f/dict 
  cat $dir/oovlist | filter_dict.pl > $dir/f/oovs
  reverse_dict.pl $dir/f/dict > $dir/b/dict
  reverse_dict.pl $dir/f/oovs > $dir/b/oovs
  
  # The next stage takes a few minutes.
  # Note: the forward stage takes longer, as English is
  # mostly a suffix-based language, and there are more rules
  # that it finds.
  for d in $dir/f $dir/b; do
   (
     cd $d
     cat dict | get_rules.pl 2>get_rules.log >rules
     get_rule_hierarchy.pl rules >hierarchy
     awk '{print $1}' dict | get_candidate_prons.pl rules dict | \
       limit_candidate_prons.pl hierarchy | \
       score_prons.pl dict | \
       count_rules.pl >rule.counts
     # the sort command below is just for convenience of reading.
     score_rules.pl <rule.counts | sort -t';' -k3,3 -n -r >rules.with_scores
     get_candidate_prons.pl rules.with_scores dict oovs | \
       limit_candidate_prons.pl hierarchy > oovs.candidates
   )  &   
  done 
  wait
  
  # Merge the candidates.
  reverse_candidates.pl $dir/b/oovs.candidates | cat - $dir/f/oovs.candidates | sort > $dir/oovs.candidates
  select_candidate_prons.pl <$dir/oovs.candidates | awk -F';' '{printf("%s  %s
  ", $1, $2);}' \
    > $dir/dict.oovs
  
  cat $dir/dict.acronyms $dir/dict.oovs | sort | uniq > $dir/dict.oovs_merged
  
  awk '{print $1}' $dir/dict.oovs_merged | uniq > $dir/oovlist.handled
  sort $dir/oovlist | diff - $dir/oovlist.handled  | grep -v 'd' | sed 's:< ::' > $dir/oovlist.not_handled
  
  
  # add_counts.pl attaches to original counts to the list of handled/not-handled OOVs
  add_counts.pl $dir/oov.counts $dir/oovlist.handled | sort -nr > $dir/oovlist.handled.counts
  add_counts.pl $dir/oov.counts $dir/oovlist.not_handled | sort -nr > $dir/oovlist.not_handled.counts
  
  echo "**Top OOVs we handled are:**"; 
  head $dir/oovlist.handled.counts
  echo "**Top OOVs we didn't handle are as follows (note: they are mostly misspellings):**"; 
  head $dir/oovlist.not_handled.counts
  
  
  echo "Count of OOVs we handled is `awk '{x+=$1} END{print x}' $dir/oovlist.handled.counts`"
  echo "Count of OOVs we couldn't handle is `awk '{x+=$1} END{print x}' $dir/oovlist.not_handled.counts`"
  echo "Count of OOVs we didn't handle due to low count is" \
      `awk -v thresh=$mincount '{if ($1 < thresh) x+=$1; } END{print x;}' $dir/oov.counts`
  # The two files created above are for humans to look at, as diagnostics.
  
  cat <<EOF | cat - $dir/dict.cmu $dir/dict.oovs_merged | sort | uniq > $dir/lexicon.txt
  !SIL SIL
  <SPOKEN_NOISE> SPN
  <UNK> SPN
  <NOISE> NSN
  EOF
  
  echo "Created $dir/lexicon.txt"