#!/bin/bash
  # Copyright 2012  Johns Hopkins University (Author: Daniel Povey)
  # Apache 2.0
  
  # Computes training alignments using a model with delta or
  # LDA+MLLT features.
  
  # If you supply the "--use-graphs true" option, it will use the training
  # graphs from the source directory (where the model is).  In this
  # case the number of jobs must match with the source directory.
  
  
  # Begin configuration section.  
  nj=4
  cmd=run.pl
  use_graphs=false
  # Begin configuration.
  scale_opts="--transition-scale=1.0 --acoustic-scale=0.1 --self-loop-scale=0.1"
  beam=10
  retry_beam=40
  boost_silence=1.0 # Factor by which to boost silence during alignment.
  # End configuration options.
  
  echo "$0 $@"  # Print the command line for logging
  
  [ -f path.sh ] && . ./path.sh # source the path.
  . parse_options.sh || exit 1;
  
  if [ $# != 4 ]; then
     echo "usage: steps/align_si.sh <data-dir> <lang-dir> <src-dir> <align-dir>"
     echo "e.g.:  steps/align_si.sh data/train data/lang exp/tri1 exp/tri1_ali"
     echo "main options (for others, see top of script file)"
     echo "  --config <config-file>                           # config containing options"
     echo "  --nj <nj>                                        # number of parallel jobs"
     echo "  --use-graphs true                                # use graphs in src-dir"
     echo "  --cmd (utils/run.pl|utils/queue.pl <queue opts>) # how to run jobs."
     exit 1;
  fi
  
  data=$1
  lang=$2
  srcdir=$3
  dir=$4
  
  oov=`cat $lang/oov.int` || exit 1;
  mkdir -p $dir/log
  echo $nj > $dir/num_jobs
  sdata=$data/split$nj
  splice_opts=`cat $srcdir/splice_opts 2>/dev/null` # frame-splicing options.
  cp $srcdir/splice_opts $dir 2>/dev/null # frame-splicing options.
  [[ -d $sdata && $data/feats.scp -ot $sdata ]] || split_data.sh $data $nj || exit 1;
  
  cp $srcdir/{tree,final.mdl} $dir || exit 1;
  cp $srcdir/final.occs $dir;
  
  
  if [ -f $srcdir/final.mat ]; then feat_type=lda; else feat_type=delta; fi
  echo "$0: feature type is $feat_type"
  
  case $feat_type in
    delta) feats="ark,s,cs:apply-cmvn --norm-vars=false --utt2spk=ark:$sdata/JOB/utt2spk scp:$sdata/JOB/cmvn.scp scp:$sdata/JOB/feats.scp ark:- | add-deltas ark:- ark:- |";;
    lda) feats="ark,s,cs:apply-cmvn --norm-vars=false --utt2spk=ark:$sdata/JOB/utt2spk scp:$sdata/JOB/cmvn.scp scp:$sdata/JOB/feats.scp ark:- | splice-feats $splice_opts ark:- ark:- | transform-feats $srcdir/final.mat ark:- ark:- |"
      cp $srcdir/final.mat $dir    
     ;;
    *) echo "$0: invalid feature type $feat_type" && exit 1;
  esac
  
  echo "$0: aligning data in $data using model from $srcdir, putting alignments in $dir"
  
  mdl="gmm-boost-silence --boost=$boost_silence `cat $lang/phones/optional_silence.csl` $dir/final.mdl - |"
  
  if $use_graphs; then 
    [ $nj != "`cat $srcdir/num_jobs`" ] && echo "$0: mismatch in num-jobs" && exit 1;
    [ ! -f $srcdir/fsts.1.gz ] && echo "$0: no such file $srcdir/fsts.1.gz" && exit 1;
  
    $cmd JOB=1:$nj $dir/log/align.JOB.log \
      gmm-align-compiled $scale_opts --beam=$beam --retry-beam=$retry_beam "$mdl" \
        "ark:gunzip -c $srcdir/fsts.JOB.gz|" "$feats" "ark:|gzip -c >$dir/ali.JOB.gz" || exit 1;
  else
    tra="ark:utils/sym2int.pl --map-oov $oov -f 2- $lang/words.txt $sdata/JOB/text|";
    # We could just use gmm-align in the next line, but it's less efficient as it compiles the
    # training graphs one by one.
    $cmd JOB=1:$nj $dir/log/align.JOB.log \
      compile-train-graphs $dir/tree $dir/final.mdl  $lang/L.fst "$tra" ark:- \| \
      gmm-align-compiled $scale_opts --beam=$beam --retry-beam=$retry_beam "$mdl" ark:- \
        "$feats" "ark,t:|gzip -c >$dir/ali.JOB.gz" || exit 1;
  fi
  
  echo "$0: done aligning data."