#!/bin/bash
  # Copyright 2012  Johns Hopkins University (Author: Daniel Povey).  Apache 2.0.
  
  
  # Train a model on top of existing features (no feature-space learning of any
  # kind is done).  This script initializes the model (i.e., the GMMs) from the
  # previous system's model.  That is: for each state in the current model (after
  # tree building), it chooses the closes state in the old model, judging the
  # similarities based on overlap of counts in the tree stats.
  
  # Begin configuration..
  cmd=run.pl
  scale_opts="--transition-scale=1.0 --acoustic-scale=0.1 --self-loop-scale=0.1"
  realign_iters="10 15"; # Only realign twice.
  num_iters=20    # Number of iterations of training
  maxiterinc=15 # Last iter to increase #Gauss on.
  batch_size=750 # batch size to use while compiling graphs... memory/speed tradeoff.
  beam=10 # alignment beam.
  retry_beam=40
  stage=-5
  cluster_thresh=-1  # for build-tree control final bottom-up clustering of leaves
  # End configuration section.
  
  echo "$0 $@"  # Print the command line for logging
  
  [ -f path.sh ] && . ./path.sh
  . parse_options.sh || exit 1;
  
  if [ $# != 6 ]; then
    echo "Usage: steps/train_quick.sh <num-leaves> <num-gauss> <data> <lang> <ali-dir> <exp-dir>"
    echo " e.g.: steps/train_quick.sh 2500 15000 data/train_si284 data/lang exp/tri3c_ali_si284 exp/tri4b"
    echo "Main options (for others, see top of script file)"
    echo "  --cmd (utils/run.pl|utils/queue.pl <queue opts>) # how to run jobs."
    echo "  --config <config-file>                           # config containing options"
    echo "  --stage <stage>                                  # stage to do partial re-run from."
    exit 1;
  fi
  
  numleaves=$1
  totgauss=$2
  data=$3
  lang=$4
  alidir=$5
  dir=$6
  
  for f in $data/feats.scp $lang/L.fst $alidir/ali.1.gz $alidir/final.mdl; do
    [ ! -f $f ] && echo "$0: no such file $f" && exit 1;
  done
  
  # Set various variables.
  oov=`cat $lang/oov.int`
  silphonelist=`cat $lang/phones/silence.csl`
  ciphonelist=`cat $lang/phones/context_indep.csl`
  numgauss=$[totgauss/2] # Start with half the total number of Gaussians.  We won't have
    # to mix up much probably, as we're initializing with the old (already mixed-up) pdf's.  
  [ $numgauss -lt $numleaves ] && numgauss=$numleaves
  incgauss=$[($totgauss-$numgauss)/$maxiterinc] # per-iter increment for #Gauss
  nj=`cat $alidir/num_jobs` || exit 1;
  sdata=$data/split$nj
  splice_opts=`cat $alidir/splice_opts 2>/dev/null` # frame-splicing options.
  cmvn_opts=`cat $alidir/cmvn_opts 2>/dev/null`
  delta_opts=`cat $alidir/delta_opts 2>/dev/null`
  
  mkdir -p $dir/log
  echo $nj >$dir/num_jobs
  cp $alidir/splice_opts $dir 2>/dev/null
  cp $alidir/cmvn_opts $dir 2>/dev/null # cmn/cmvn option.
  cp $alidir/delta_opts $dir 2>/dev/null
  [[ -d $sdata && $data/feats.scp -ot $sdata ]] || split_data.sh $data $nj || exit 1;
  
  utils/lang/check_phones_compatible.sh $lang/phones.txt $alidir/phones.txt || exit 1;
  cp $lang/phones.txt $dir || exit 1;
  
  ## Set up features.
  if [ -f $alidir/final.mat ]; then feat_type=lda; else feat_type=delta; fi
  echo "$0: feature type is $feat_type"
  
  case $feat_type in
    delta) sifeats="ark,s,cs:apply-cmvn $cmvn_opts --utt2spk=ark:$sdata/JOB/utt2spk scp:$sdata/JOB/cmvn.scp scp:$sdata/JOB/feats.scp ark:- | add-deltas $delta_opts ark:- ark:- |";;
    lda) sifeats="ark,s,cs:apply-cmvn $cmvn_opts --utt2spk=ark:$sdata/JOB/utt2spk scp:$sdata/JOB/cmvn.scp scp:$sdata/JOB/feats.scp ark:- | splice-feats $splice_opts ark:- ark:- | transform-feats $alidir/final.mat ark:- ark:- |"
      cp $alidir/final.mat $dir    
      cp $alidir/full.mat $dir 2>/dev/null
      ;;
    *) echo "Invalid feature type $feat_type" && exit 1;
  esac
  if [ -f $alidir/trans.1 ]; then
    echo "$0: using transforms from $alidir"
    ln.pl $alidir/trans.* $dir # Link them to dest dir.
    feats="$sifeats transform-feats --utt2spk=ark:$sdata/JOB/utt2spk ark,s,cs:$dir/trans.JOB ark:- ark:- |"
  else
    feats="$sifeats"
  fi
  ##
  
  
  if [ $stage -le -5 ]; then
    echo "$0: accumulating tree stats"
    $cmd JOB=1:$nj $dir/log/acc_tree.JOB.log \
      acc-tree-stats  --ci-phones=$ciphonelist $alidir/final.mdl "$feats" \
      "ark:gunzip -c $alidir/ali.JOB.gz|" $dir/JOB.treeacc || exit 1;
    [ "`ls $dir/*.treeacc | wc -w`" -ne "$nj" ] && echo "$0: Wrong #tree-stats" && exit 1;
    sum-tree-stats $dir/treeacc $dir/*.treeacc 2>$dir/log/sum_tree_acc.log || exit 1;
    rm $dir/*.treeacc
  fi
  
  if [ $stage -le -4 ]; then
    echo "$0: Getting questions for tree clustering."
    # preparing questions, roots file...
    cluster-phones $dir/treeacc $lang/phones/sets.int $dir/questions.int 2> $dir/log/questions.log || exit 1;
    cat $lang/phones/extra_questions.int >> $dir/questions.int
    compile-questions $lang/topo $dir/questions.int $dir/questions.qst 2>$dir/log/compile_questions.log || exit 1;
  
    echo "$0: Building the tree"
    $cmd $dir/log/build_tree.log \
      build-tree --verbose=1 --max-leaves=$numleaves \
      --cluster-thresh=$cluster_thresh $dir/treeacc $lang/phones/roots.int \
      $dir/questions.qst $lang/topo $dir/tree || exit 1;
  fi
  
  if [ $stage -le -3 ]; then
    echo "$0: Initializing the model"
  
    # The gmm-init-model command (with more than the normal # of command-line args)
    # will initialize the p.d.f.'s to the p.d.f.'s in the alignment model.
  
    gmm-init-model  --write-occs=$dir/1.occs  \
      $dir/tree $dir/treeacc $lang/topo $dir/tmp.mdl $alidir/tree $alidir/final.mdl  \
      2>$dir/log/init_model.log || exit 1;
  
    grep 'no stats' $dir/log/init_model.log && echo "$0: This is a bad warning.";
    rm $dir/treeacc
  fi
  
  if [ $stage -le -2 ]; then
    echo "$0: mixing up old model."
    # We do both mixing-down and mixing-up to get the target #Gauss in each state,
    # since the initial model may have either more or fewer Gaussians than we want.
    gmm-mixup --mix-down=$numgauss --mix-up=$numgauss $dir/tmp.mdl $dir/1.occs $dir/1.mdl \
      2> $dir/log/mixup.log || exit 1;
    rm $dir/tmp.mdl 
  fi
  
  # Convert alignments to the new tree.
  if [ $stage -le -1 ]; then
    echo "$0: converting old alignments"
    $cmd JOB=1:$nj $dir/log/convert.JOB.log \
      convert-ali $alidir/final.mdl $dir/1.mdl $dir/tree \
      "ark:gunzip -c $alidir/ali.JOB.gz|" "ark:|gzip -c >$dir/ali.JOB.gz" || exit 1;
  fi
  
  if [ $stage -le 0 ]; then
    echo "$0: compiling training graphs"
    $cmd JOB=1:$nj $dir/log/compile_graphs.JOB.log \
      compile-train-graphs --read-disambig-syms=$lang/phones/disambig.int --batch-size=$batch_size $dir/tree $dir/1.mdl $lang/L.fst  \
      "ark:sym2int.pl --map-oov $oov -f 2- $lang/words.txt < $sdata/JOB/text |" \
      "ark:|gzip -c >$dir/fsts.JOB.gz" || exit 1;
  fi
  
  x=1
  while [ $x -lt $num_iters ]; do
    echo "$0: pass $x"
    if echo $realign_iters | grep -w $x >/dev/null && [ $stage -le $x ]; then
      echo "$0: aligning data"
      $cmd JOB=1:$nj $dir/log/align.$x.JOB.log \
        gmm-align-compiled $scale_opts --beam=$beam --retry-beam=$retry_beam $dir/$x.mdl \
        "ark:gunzip -c $dir/fsts.JOB.gz|" "$feats" "ark:|gzip -c >$dir/ali.JOB.gz" \
        || exit 1;
    fi
    if [ $stage -le $x ]; then
      $cmd JOB=1:$nj $dir/log/acc.$x.JOB.log \
        gmm-acc-stats-ali  $dir/$x.mdl "$feats" \
        "ark,s,cs:gunzip -c $dir/ali.JOB.gz|"  $dir/$x.JOB.acc || exit 1;
      [ "`ls $dir/$x.*.acc | wc -w`" -ne "$nj" ] && echo "$0: wrong #accs" && exit 1;
      $cmd $dir/log/update.$x.log \
        gmm-est --write-occs=$dir/$[$x+1].occs --mix-up=$numgauss $dir/$x.mdl \
        "gmm-sum-accs - $dir/$x.*.acc |" $dir/$[$x+1].mdl || exit 1;
      rm $dir/$x.mdl $dir/$x.*.acc $dir/$x.occs
    fi
    [[ $x -le $maxiterinc ]] && numgauss=$[$numgauss+$incgauss];
    x=$[$x+1];
  done
  
  if [ -f $alidir/trans.1 ]; then
    echo "$0: estimating alignment model"
    $cmd JOB=1:$nj $dir/log/acc_alimdl.JOB.log \
      ali-to-post "ark:gunzip -c $dir/ali.JOB.gz|" ark:-  \| \
      gmm-acc-stats-twofeats $dir/$x.mdl "$feats" "$sifeats" \
      ark,s,cs:- $dir/$x.JOB.acc || exit 1;
    [ "`ls $dir/$x.*.acc | wc -w`" -ne "$nj" ] && echo "$0: wrong #accs" && exit 1;
  
    $cmd $dir/log/est_alimdl.log \
      gmm-est --write-occs=$dir/final.occs --remove-low-count-gaussians=false $dir/$x.mdl \
      "gmm-sum-accs - $dir/$x.*.acc|" $dir/$x.alimdl || exit 1;
    rm $dir/$x.*.acc
    rm $dir/final.alimdl 2>/dev/null 
    ln -s $x.alimdl $dir/final.alimdl
  fi
  
  rm $dir/final.mdl 2>/dev/null
  ln -s $x.mdl $dir/final.mdl
  
  echo Done