#!/bin/bash
  # Copyright   2017   Johns Hopkins University (Author: Daniel Garcia-Romero)
  #             2017   Johns Hopkins University (Author: Daniel Povey)
  #        2017-2018   David Snyder
  #             2018   Ewald Enzinger
  # Apache 2.0.
  #
  # See ../README.txt for more info on data required.
  # Results (mostly equal error-rates) are inline in comments below.
  
  . ./cmd.sh
  . ./path.sh
  set -e
  mfccdir=`pwd`/mfcc
  vaddir=`pwd`/mfcc
  
  
  # The trials file is downloaded by local/make_voxceleb1_v2.pl.
  voxceleb1_trials=data/voxceleb1_test/trials
  voxceleb1_root=/export/corpora/VoxCeleb1
  voxceleb2_root=/export/corpora/VoxCeleb2
  nnet_dir=exp/xvector_nnet_1a
  musan_root=/export/corpora/JHU/musan
  
  stage=0
  
  if [ $stage -le 0 ]; then
    local/make_voxceleb2.pl $voxceleb2_root dev data/voxceleb2_train
    local/make_voxceleb2.pl $voxceleb2_root test data/voxceleb2_test
    # This script creates data/voxceleb1_test and data/voxceleb1_train for latest version of VoxCeleb1.
    # Our evaluation set is the test portion of VoxCeleb1.
    local/make_voxceleb1_v2.pl $voxceleb1_root dev data/voxceleb1_train
    local/make_voxceleb1_v2.pl $voxceleb1_root test data/voxceleb1_test
    # if you downloaded the dataset soon after it was released, you will want to use the make_voxceleb1.pl script instead.
    # local/make_voxceleb1.pl $voxceleb1_root data
    # We'll train on all of VoxCeleb2, plus the training portion of VoxCeleb1.
    # This should give 7,323 speakers and 1,276,888 utterances.
    utils/combine_data.sh data/train data/voxceleb2_train data/voxceleb2_test data/voxceleb1_train
  fi
  
  if [ $stage -le 1 ]; then
    # Make MFCCs and compute the energy-based VAD for each dataset
    for name in train voxceleb1_test; do
      steps/make_mfcc.sh --write-utt2num-frames true --mfcc-config conf/mfcc.conf --nj 40 --cmd "$train_cmd" \
        data/${name} exp/make_mfcc $mfccdir
      utils/fix_data_dir.sh data/${name}
      sid/compute_vad_decision.sh --nj 40 --cmd "$train_cmd" \
        data/${name} exp/make_vad $vaddir
      utils/fix_data_dir.sh data/${name}
    done
  fi
  
  # In this section, we augment the VoxCeleb2 data with reverberation,
  # noise, music, and babble, and combine it with the clean data.
  if [ $stage -le 2 ]; then
    frame_shift=0.01
    awk -v frame_shift=$frame_shift '{print $1, $2*frame_shift;}' data/train/utt2num_frames > data/train/reco2dur
  
    if [ ! -d "RIRS_NOISES" ]; then
      # Download the package that includes the real RIRs, simulated RIRs, isotropic noises and point-source noises
      wget --no-check-certificate http://www.openslr.org/resources/28/rirs_noises.zip
      unzip rirs_noises.zip
    fi
  
    # Make a version with reverberated speech
    rvb_opts=()
    rvb_opts+=(--rir-set-parameters "0.5, RIRS_NOISES/simulated_rirs/smallroom/rir_list")
    rvb_opts+=(--rir-set-parameters "0.5, RIRS_NOISES/simulated_rirs/mediumroom/rir_list")
  
    # Make a reverberated version of the VoxCeleb2 list.  Note that we don't add any
    # additive noise here.
    steps/data/reverberate_data_dir.py \
      "${rvb_opts[@]}" \
      --speech-rvb-probability 1 \
      --pointsource-noise-addition-probability 0 \
      --isotropic-noise-addition-probability 0 \
      --num-replications 1 \
      --source-sampling-rate 16000 \
      data/train data/train_reverb
    cp data/train/vad.scp data/train_reverb/
    utils/copy_data_dir.sh --utt-suffix "-reverb" data/train_reverb data/train_reverb.new
    rm -rf data/train_reverb
    mv data/train_reverb.new data/train_reverb
  
    # Prepare the MUSAN corpus, which consists of music, speech, and noise
    # suitable for augmentation.
    steps/data/make_musan.sh --sampling-rate 16000 $musan_root data
  
    # Get the duration of the MUSAN recordings.  This will be used by the
    # script augment_data_dir.py.
    for name in speech noise music; do
      utils/data/get_utt2dur.sh data/musan_${name}
      mv data/musan_${name}/utt2dur data/musan_${name}/reco2dur
    done
  
    # Augment with musan_noise
    steps/data/augment_data_dir.py --utt-suffix "noise" --fg-interval 1 --fg-snrs "15:10:5:0" --fg-noise-dir "data/musan_noise" data/train data/train_noise
    # Augment with musan_music
    steps/data/augment_data_dir.py --utt-suffix "music" --bg-snrs "15:10:8:5" --num-bg-noises "1" --bg-noise-dir "data/musan_music" data/train data/train_music
    # Augment with musan_speech
    steps/data/augment_data_dir.py --utt-suffix "babble" --bg-snrs "20:17:15:13" --num-bg-noises "3:4:5:6:7" --bg-noise-dir "data/musan_speech" data/train data/train_babble
  
    # Combine reverb, noise, music, and babble into one directory.
    utils/combine_data.sh data/train_aug data/train_reverb data/train_noise data/train_music data/train_babble
  fi
  
  if [ $stage -le 3 ]; then
    # Take a random subset of the augmentations
    utils/subset_data_dir.sh data/train_aug 1000000 data/train_aug_1m
    utils/fix_data_dir.sh data/train_aug_1m
  
    # Make MFCCs for the augmented data.  Note that we do not compute a new
    # vad.scp file here.  Instead, we use the vad.scp from the clean version of
    # the list.
    steps/make_mfcc.sh --mfcc-config conf/mfcc.conf --nj 40 --cmd "$train_cmd" \
      data/train_aug_1m exp/make_mfcc $mfccdir
  
    # Combine the clean and augmented VoxCeleb2 list.  This is now roughly
    # double the size of the original clean list.
    utils/combine_data.sh data/train_combined data/train_aug_1m data/train
  fi
  
  # Now we prepare the features to generate examples for xvector training.
  if [ $stage -le 4 ]; then
    # This script applies CMVN and removes nonspeech frames.  Note that this is somewhat
    # wasteful, as it roughly doubles the amount of training data on disk.  After
    # creating training examples, this can be removed.
    local/nnet3/xvector/prepare_feats_for_egs.sh --nj 40 --cmd "$train_cmd" \
      data/train_combined data/train_combined_no_sil exp/train_combined_no_sil
    utils/fix_data_dir.sh data/train_combined_no_sil
  fi
  
  if [ $stage -le 5 ]; then
    # Now, we need to remove features that are too short after removing silence
    # frames.  We want atleast 5s (500 frames) per utterance.
    min_len=400
    mv data/train_combined_no_sil/utt2num_frames data/train_combined_no_sil/utt2num_frames.bak
    awk -v min_len=${min_len} '$2 > min_len {print $1, $2}' data/train_combined_no_sil/utt2num_frames.bak > data/train_combined_no_sil/utt2num_frames
    utils/filter_scp.pl data/train_combined_no_sil/utt2num_frames data/train_combined_no_sil/utt2spk > data/train_combined_no_sil/utt2spk.new
    mv data/train_combined_no_sil/utt2spk.new data/train_combined_no_sil/utt2spk
    utils/fix_data_dir.sh data/train_combined_no_sil
  
    # We also want several utterances per speaker. Now we'll throw out speakers
    # with fewer than 8 utterances.
    min_num_utts=8
    awk '{print $1, NF-1}' data/train_combined_no_sil/spk2utt > data/train_combined_no_sil/spk2num
    awk -v min_num_utts=${min_num_utts} '$2 >= min_num_utts {print $1, $2}' data/train_combined_no_sil/spk2num | utils/filter_scp.pl - data/train_combined_no_sil/spk2utt > data/train_combined_no_sil/spk2utt.new
    mv data/train_combined_no_sil/spk2utt.new data/train_combined_no_sil/spk2utt
    utils/spk2utt_to_utt2spk.pl data/train_combined_no_sil/spk2utt > data/train_combined_no_sil/utt2spk
  
    utils/filter_scp.pl data/train_combined_no_sil/utt2spk data/train_combined_no_sil/utt2num_frames > data/train_combined_no_sil/utt2num_frames.new
    mv data/train_combined_no_sil/utt2num_frames.new data/train_combined_no_sil/utt2num_frames
  
    # Now we're ready to create training examples.
    utils/fix_data_dir.sh data/train_combined_no_sil
  fi
  
  # Stages 6 through 8 are handled in run_xvector.sh
  local/nnet3/xvector/run_xvector.sh --stage $stage --train-stage -1 \
    --data data/train_combined_no_sil --nnet-dir $nnet_dir \
    --egs-dir $nnet_dir/egs
  
  if [ $stage -le 9 ]; then
    # Extract x-vectors for centering, LDA, and PLDA training.
    sid/nnet3/xvector/extract_xvectors.sh --cmd "$train_cmd --mem 4G" --nj 80 \
      $nnet_dir data/train \
      $nnet_dir/xvectors_train
  
    # Extract x-vectors used in the evaluation.
    sid/nnet3/xvector/extract_xvectors.sh --cmd "$train_cmd --mem 4G" --nj 40 \
      $nnet_dir data/voxceleb1_test \
      $nnet_dir/xvectors_voxceleb1_test
  fi
  
  if [ $stage -le 10 ]; then
    # Compute the mean vector for centering the evaluation xvectors.
    $train_cmd $nnet_dir/xvectors_train/log/compute_mean.log \
      ivector-mean scp:$nnet_dir/xvectors_train/xvector.scp \
      $nnet_dir/xvectors_train/mean.vec || exit 1;
  
    # This script uses LDA to decrease the dimensionality prior to PLDA.
    lda_dim=200
    $train_cmd $nnet_dir/xvectors_train/log/lda.log \
      ivector-compute-lda --total-covariance-factor=0.0 --dim=$lda_dim \
      "ark:ivector-subtract-global-mean scp:$nnet_dir/xvectors_train/xvector.scp ark:- |" \
      ark:data/train/utt2spk $nnet_dir/xvectors_train/transform.mat || exit 1;
  
    # Train the PLDA model.
    $train_cmd $nnet_dir/xvectors_train/log/plda.log \
      ivector-compute-plda ark:data/train/spk2utt \
      "ark:ivector-subtract-global-mean scp:$nnet_dir/xvectors_train/xvector.scp ark:- | transform-vec $nnet_dir/xvectors_train/transform.mat ark:- ark:- | ivector-normalize-length ark:-  ark:- |" \
      $nnet_dir/xvectors_train/plda || exit 1;
  fi
  
  if [ $stage -le 11 ]; then
    $train_cmd exp/scores/log/voxceleb1_test_scoring.log \
      ivector-plda-scoring --normalize-length=true \
      "ivector-copy-plda --smoothing=0.0 $nnet_dir/xvectors_train/plda - |" \
      "ark:ivector-subtract-global-mean $nnet_dir/xvectors_train/mean.vec scp:$nnet_dir/xvectors_voxceleb1_test/xvector.scp ark:- | transform-vec $nnet_dir/xvectors_train/transform.mat ark:- ark:- | ivector-normalize-length ark:- ark:- |" \
      "ark:ivector-subtract-global-mean $nnet_dir/xvectors_train/mean.vec scp:$nnet_dir/xvectors_voxceleb1_test/xvector.scp ark:- | transform-vec $nnet_dir/xvectors_train/transform.mat ark:- ark:- | ivector-normalize-length ark:- ark:- |" \
      "cat '$voxceleb1_trials' | cut -d\  --fields=1,2 |" exp/scores_voxceleb1_test || exit 1;
  fi
  
  if [ $stage -le 12 ]; then
    eer=`compute-eer <(local/prepare_for_eer.py $voxceleb1_trials exp/scores_voxceleb1_test) 2> /dev/null`
    mindcf1=`sid/compute_min_dcf.py --p-target 0.01 exp/scores_voxceleb1_test $voxceleb1_trials 2> /dev/null`
    mindcf2=`sid/compute_min_dcf.py --p-target 0.001 exp/scores_voxceleb1_test $voxceleb1_trials 2> /dev/null`
    echo "EER: $eer%"
    echo "minDCF(p-target=0.01): $mindcf1"
    echo "minDCF(p-target=0.001): $mindcf2"
    # EER: 3.128%
    # minDCF(p-target=0.01): 0.3258
    # minDCF(p-target=0.001): 0.5003
    #
    # For reference, here's the ivector system from ../v1:
    # EER: 5.329%
    # minDCF(p-target=0.01): 0.4933
    # minDCF(p-target=0.001): 0.6168
  fi