#!/usr/bin/env bash

# This is a basic TDNN+LSTM nnet3 experiment.


# steps/info/nnet3_dir_info.pl exp/nnet3/tdnn_lstm1a_sp
# exp/nnet3/tdnn_lstm1a_sp: num-iters=32 nj=2..2 num-params=8.4M dim=40+100->2041 combine=-0.47->-0.38 loglike:train/valid[20,31,combined]=(-0.62,-0.38,-0.37/-1.03,-1.03,-1.02) accuracy:train/valid[20,31,combined]=(0.79,0.87,0.87/0.70,0.72,0.72)

# Below, comparing with the chain TDNN system.  It's a little better with the
# small-vocab decoding.  Both systems are probably super-badly tuned, and the
# chain system probably used too many jobs.
#
# local/nnet3/compare_wer.sh exp/chain/tdnn1a_sp exp/nnet3/tdnn_lstm1a_sp
# System                tdnn1a_sp tdnn_lstm1a_sp
#WER dev_clean_2 (tgsmall)      18.43     17.37
#WER dev_clean_2 (tglarge)      13.15     13.43
# Final train prob                  -0.3933
# Final valid prob                  -0.9662
# Final train acc                    0.8652
# Final valid acc                    0.7206

# Set -e here so that we catch if any executable fails immediately
set -euo pipefail

# First the options that are passed through to run_ivector_common.sh
# (some of which are also used in this script directly).
stage=0
decode_nj=10
train_set=train_clean_5
test_sets=dev_clean_2
gmm=tri3b
nnet3_affix=

# The rest are configs specific to this script.  Most of the parameters
# are just hardcoded at this level, in the commands below.
affix=1a   # affix for the TDNN directory name
train_stage=-10
get_egs_stage=-10
decode_iter=

# training options
# training chunk-options
chunk_width=40,30,20
chunk_left_context=40
chunk_right_context=0
common_egs_dir=
xent_regularize=0.1

# training options
srand=0
remove_egs=true
reporting_email=

#decode options
test_online_decoding=true  # if true, it will run the last decoding stage.


# End configuration section.
echo "$0 $@"  # Print the command line for logging

. ./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

# The iVector-extraction and feature-dumping parts are the same as the standard
# nnet3 setup, and you can skip them by setting "--stage 11" if you have already
# run those things.
local/nnet3/run_ivector_common.sh --stage $stage \
                                  --train-set $train_set \
                                  --gmm $gmm \
                                  --nnet3-affix "$nnet3_affix" || exit 1;

# Problem: We have removed the "train_" prefix of our training set in
# the alignment directory names! Bad!
gmm_dir=exp/$gmm
ali_dir=exp/${gmm}_ali_${train_set}_sp
lang=data/lang
label_delay=5

dir=exp/nnet3${nnet3_affix}/tdnn_lstm${affix}_sp
train_data_dir=data/${train_set}_sp_hires
train_ivector_dir=exp/nnet3${nnet3_affix}/ivectors_${train_set}_sp_hires

for f in $gmm_dir/final.mdl $train_data_dir/feats.scp $train_ivector_dir/ivector_online.scp \
    $gmm_dir/graph_tgsmall/HCLG.fst $ali_dir/ali.1.gz; do
  [ ! -f $f ] && echo "$0: expected file $f to exist" && exit 1
done

if [ $stage -le 10 ]; then
  mkdir -p $dir
  echo "$0: creating neural net configs using the xconfig parser";

  num_targets=$(tree-info $ali_dir/tree |grep num-pdfs|awk '{print $2}')
  learning_rate_factor=$(echo "print 0.5/$xent_regularize" | python)

  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

  relu-renorm-layer name=tdnn1 dim=520
  relu-renorm-layer name=tdnn2 dim=520 input=Append(-1,0,1)
  fast-lstmp-layer name=lstm1 cell-dim=520 recurrent-projection-dim=130 non-recurrent-projection-dim=130 decay-time=20 delay=-3
  relu-renorm-layer name=tdnn3 dim=520 input=Append(-3,0,3)
  relu-renorm-layer name=tdnn4 dim=520 input=Append(-3,0,3)
  fast-lstmp-layer name=lstm2 cell-dim=520 recurrent-projection-dim=130 non-recurrent-projection-dim=130 decay-time=20 delay=-3
  relu-renorm-layer name=tdnn5 dim=520 input=Append(-3,0,3)
  relu-renorm-layer name=tdnn6 dim=520 input=Append(-3,0,3)
  fast-lstmp-layer name=lstm3 cell-dim=520 recurrent-projection-dim=130 non-recurrent-projection-dim=130 decay-time=20 delay=-3

  output-layer name=output input=lstm3 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/
fi


if [ $stage -le 11 ]; 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/mini_librispeech-$(date +'%m_%d_%H_%M')/s5/$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.max-param-change=2.0 \
    --trainer.num-epochs=6 \
    --trainer.deriv-truncate-margin=10 \
    --trainer.samples-per-iter=20000 \
    --trainer.optimization.num-jobs-initial=1 \
    --trainer.optimization.num-jobs-final=2 \
    --trainer.optimization.initial-effective-lrate=0.0003 \
    --trainer.optimization.final-effective-lrate=0.00003 \
    --trainer.optimization.shrink-value=0.99 \
    --trainer.rnn.num-chunk-per-minibatch=128,64 \
    --trainer.optimization.momentum=0.5 \
    --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=$remove_egs \
    --use-gpu=true \
    --reporting.email="$reporting_email" \
    --feat-dir=$train_data_dir \
    --ali-dir=$ali_dir \
    --lang=$lang \
    --dir=$dir  || exit 1;
fi

if [ $stage -le 12 ]; then
  frames_per_chunk=$(echo $chunk_width | cut -d, -f1)
  rm $dir/.error 2>/dev/null || true

  for data in $test_sets; do
    (
      nspk=$(wc -l <data/${data}_hires/spk2utt)
      steps/nnet3/decode.sh \
          --extra-left-context $chunk_left_context \
          --extra-right-context $chunk_right_context \
          --extra-left-context-initial 0 \
          --extra-right-context-final 0 \
          --frames-per-chunk $frames_per_chunk \
          --nj $nspk --cmd "$decode_cmd"  --num-threads 4 \
          --online-ivector-dir exp/nnet3${nnet3_affix}/ivectors_${data}_hires \
          $gmm_dir/graph_tgsmall data/${data}_hires ${dir}/decode_tgsmall_${data} || exit 1
      steps/lmrescore_const_arpa.sh --cmd "$decode_cmd" \
        data/lang_test_{tgsmall,tglarge} \
       data/${data}_hires ${dir}/decode_{tgsmall,tglarge}_${data} || exit 1
    ) || touch $dir/.error &
  done
  wait
  [ -f $dir/.error ] && echo "$0: there was a problem while decoding" && exit 1
fi

# Not testing the 'looped' decoding separately, because for
# TDNN systems it would give exactly the same results as the
# normal decoding.

if $test_online_decoding && [ $stage -le 13 ]; then
  # note: if the features change (e.g. you add pitch features), you will have to
  # change the options of the following command line.
  steps/online/nnet3/prepare_online_decoding.sh \
    --mfcc-config conf/mfcc_hires.conf \
    $lang exp/nnet3${nnet3_affix}/extractor ${dir} ${dir}_online

  rm $dir/.error 2>/dev/null || true

  for data in $test_sets; do
    (
      nspk=$(wc -l <data/${data}_hires/spk2utt)
      # note: we just give it "data/${data}" as it only uses the wav.scp, the
      # feature type does not matter.
      steps/online/nnet3/decode.sh \
        --nj $nspk --cmd "$decode_cmd" \
        $gmm_dir/graph_tgsmall data/${data} ${dir}_online/decode_tgsmall_${data} || exit 1
      steps/lmrescore_const_arpa.sh --cmd "$decode_cmd" \
        data/lang_test_{tgsmall,tglarge} \
       data/${data}_hires ${dir}_online/decode_{tgsmall,tglarge}_${data} || exit 1
    ) || touch $dir/.error &
  done
  wait
  [ -f $dir/.error ] && echo "$0: there was a problem while decoding" && exit 1
fi


exit 0;
