#!/bin/bash
  
  # Copyright 2012  Vassil Panayotov
  #           2017  Ewald Enzinger
  # Apache 2.0
  
  # Adapted from egs/voxforge/s5/prepare_lm.sh (commit 1d9b858adc3e23bdbd9bf30231923755a1813cd0)
  
  . ./path.sh || exit 1
  
  echo "=== Building a language model ..."
  
  data=data/valid_train
  locdata=data/local
  # Language model order
  order=3
  
  . utils/parse_options.sh
  
  # Prepare a LM training corpus from the transcripts
  mkdir -p $locdata
  cut -f2- -d' ' < $data/text |\
    sed -e 's:[ ]\+: :g' | sort -u > $locdata/corpus.txt
  
  loc=`which ngram-count`;
  if [ -z $loc ]; then
    if uname -a | grep 64 >/dev/null; then # some kind of 64 bit...
      sdir=$KALDI_ROOT/tools/srilm/bin/i686-m64 
    else
      sdir=$KALDI_ROOT/tools/srilm/bin/i686
    fi
    if [ -f $sdir/ngram-count ]; then
      echo Using SRILM tools from $sdir
      export PATH=$PATH:$sdir
    else
      echo You appear to not have SRILM tools installed, either on your path,
      echo or installed in $sdir.  See tools/install_srilm.sh for installation
      echo instructions.
      exit 1
    fi
  fi
  
  ngram-count -order $order -write-vocab $locdata/vocab-full.txt -wbdiscount \
    -text $locdata/corpus.txt -lm $locdata/lm.gz
  
  echo "*** Finished building the LM model!"