#!/bin/bash
  
  #    This is the standard "lstm" system, built in nnet3; this script
  # is the version that's meant to run with data-cleanup, that doesn't
  # support parallel alignments.
  
  
  # by default, with cleanup:
  # local/nnet3/run_lstm.sh
  
  # without cleanup:
  # local/nnet3/run_lstm.sh  --train-set train --gmm tri3 --nnet3-affix "" &
  
  
  set -e -o pipefail -u
  
  # First the options that are passed through to run_ivector_common.sh
  # (some of which are also used in this script directly).
  stage=0
  nj=30
  decode_nj=30
  min_seg_len=1.55
  train_set=train_cleaned
  gmm=tri3_cleaned  # this is the source gmm-dir for the data-type of interest; it
                    # should have alignments for the specified training data.
  num_threads_ubm=32
  nnet3_affix=_cleaned  # cleanup affix for exp dirs, e.g. _cleaned
  
  # Options which are not passed through to run_ivector_common.sh
  affix=
  common_egs_dir=
  reporting_email=
  
  # LSTM options
  train_stage=-10
  label_delay=5
  cell_dim=1024
  recurrent_projection_dim=256
  non_recurrent_projection_dim=256
  chunk_width=20
  chunk_left_context=40
  chunk_right_context=0
  max_param_change=2.0
  
  # training options
  srand=0
  num_epochs=6
  initial_effective_lrate=0.0003
  final_effective_lrate=0.00003
  num_jobs_initial=3
  num_jobs_final=15
  momentum=0.5
  num_chunk_per_minibatch=128,64
  samples_per_iter=20000
  remove_egs=true
  
  #decode options
  extra_left_context=
  extra_right_context=
  frames_per_chunk=
  
  . ./cmd.sh
  . ./path.sh
  . ./utils/parse_options.sh
  
  if ! cuda-compiled; then
    cat <<EOF && exit 1
  This script is intended to be used with GPUs but you have not compiled Kaldi with CUDA
  If you want to use GPUs (and have them), go to src/, and configure and make on a machine
  where "nvcc" is installed.
  EOF
  fi
  
  local/nnet3/run_ivector_common.sh --stage $stage \
                                    --nj $nj \
                                    --min-seg-len $min_seg_len \
                                    --train-set $train_set \
                                    --gmm $gmm \
                                    --num-threads-ubm $num_threads_ubm \
                                    --nnet3-affix "$nnet3_affix"
  
  
  
  gmm_dir=exp/${gmm}
  graph_dir=$gmm_dir/graph
  ali_dir=exp/${gmm}_ali_${train_set}_sp_comb
  dir=exp/nnet3${nnet3_affix}/lstm${affix:+_$affix}
  if [ $label_delay -gt 0 ]; then dir=${dir}_ld$label_delay; fi
  dir=${dir}_sp
  train_data_dir=data/${train_set}_sp_hires_comb
  train_ivector_dir=exp/nnet3${nnet3_affix}/ivectors_${train_set}_sp_hires_comb
  
  
  for f in $train_data_dir/feats.scp $train_ivector_dir/ivector_online.scp \
       $graph_dir/HCLG.fst $ali_dir/ali.1.gz $gmm_dir/final.mdl; do
    [ ! -f $f ] && echo "$0: expected file $f to exist" && exit 1
  done
  
  if [ $stage -le 12 ]; then
    echo "$0: creating neural net configs using the xconfig parser";
  
    num_targets=$(tree-info $gmm_dir/tree | grep num-pdfs | awk '{print $2}')
    [ -z $num_targets ] && { echo "$0: error getting num-targets"; exit 1; }
  
    lstm_opts="decay-time=20 cell-dim=$cell_dim"
    lstm_opts+=" recurrent-projection-dim=$recurrent_projection_dim"
    lstm_opts+=" non-recurrent-projection-dim=$non_recurrent_projection_dim"
  
    mkdir -p $dir/configs
    cat <<EOF > $dir/configs/network.xconfig
    input dim=100 name=ivector
    input dim=40 name=input
  
    # please note that it is important to have input layer with the name=input
    # as the layer immediately preceding the fixed-affine-layer to enable
    # the use of short notation for the descriptor
    fixed-affine-layer name=lda delay=$label_delay input=Append(-2,-1,0,1,2,ReplaceIndex(ivector, t, 0)) affine-transform-file=$dir/configs/lda.mat
  
    # check steps/libs/nnet3/xconfig/lstm.py for the other options and defaults
    fast-lstmp-layer name=fastlstm1 delay=-1 $lstm_opts
    fast-lstmp-layer name=fastlstm2 delay=-2 $lstm_opts
    fast-lstmp-layer name=fastlstm3 delay=-3 $lstm_opts
    output-layer name=output output-delay=$label_delay dim=$num_targets max-change=1.5
  EOF
    steps/nnet3/xconfig_to_configs.py --xconfig-file $dir/configs/network.xconfig --config-dir $dir/configs || exit 1
  fi
  
  if [ $stage -le 13 ]; then
    if [[ $(hostname -f) == *.clsp.jhu.edu ]] && [ ! -d $dir/egs/storage ]; then
      utils/create_split_dir.pl \
       /export/b0{3,4,5,6}/$USER/kaldi-data/egs/tedlium-$(date +'%m_%d_%H_%M')/s5_r2/$dir/egs/storage $dir/egs/storage
    fi
  
    steps/nnet3/train_rnn.py --stage=$train_stage \
      --cmd="$decode_cmd" \
      --feat.online-ivector-dir=$train_ivector_dir \
      --feat.cmvn-opts="--norm-means=false --norm-vars=false" \
      --trainer.srand=$srand \
      --trainer.num-epochs=$num_epochs \
      --trainer.samples-per-iter=$samples_per_iter \
      --trainer.optimization.num-jobs-initial=$num_jobs_initial \
      --trainer.optimization.num-jobs-final=$num_jobs_final \
      --trainer.optimization.initial-effective-lrate=$initial_effective_lrate \
      --trainer.optimization.final-effective-lrate=$final_effective_lrate \
      --trainer.optimization.shrink-value 0.99 \
      --trainer.rnn.num-chunk-per-minibatch=$num_chunk_per_minibatch \
      --trainer.optimization.momentum=$momentum \
      --egs.chunk-width=$chunk_width \
      --egs.chunk-left-context=$chunk_left_context \
      --egs.chunk-right-context=$chunk_right_context \
      --egs.chunk-left-context-initial=0 \
      --egs.chunk-right-context-final=0 \
      --egs.dir="$common_egs_dir" \
      --cleanup.remove-egs=$remove_egs \
      --cleanup.preserve-model-interval=1 \
      --use-gpu=true \
      --feat-dir=$train_data_dir \
      --ali-dir=$ali_dir \
      --lang=data/lang \
      --reporting.email="$reporting_email" \
      --dir=$dir  || exit 1;
  fi
  
  if [ $stage -le 14 ]; then
    [ -z $extra_left_context ] && extra_left_context=$chunk_left_context;
    [ -z $extra_right_context ] && extra_right_context=$chunk_right_context;
    [ -z $frames_per_chunk ] && frames_per_chunk=$chunk_width;
    rm $dir/.error 2>/dev/null || true
    for dset in dev test; do
     (
      steps/nnet3/decode.sh --nj $decode_nj --cmd "$decode_cmd"  --num-threads 4 \
          --extra-left-context $extra_left_context \
          --extra-right-context $extra_right_context \
          --extra-left-context-initial 0 \
          --extra-right-context-final 0 \
          --online-ivector-dir exp/nnet3${nnet3_affix}/ivectors_${dset}_hires \
        ${graph_dir} data/${dset}_hires ${dir}/decode_${dset} || exit 1
      steps/lmrescore_const_arpa.sh --cmd "$decode_cmd" data/lang data/lang_rescore \
         data/${dset}_hires ${dir}/decode_${dset} ${dir}/decode_${dset}_rescore || exit 1
      ) || touch $dir/.error &
    done
    wait
    [ -f $dir/.error ] && echo "$0: there was a problem while decoding" && exit 1
  fi
  
  
  exit 0;