# download the official NVidia's wav2letter++ model checkpoint from Google Drive via the link they provide
CHECKPOINT_GOOGLE_DRIVE_URL='https://drive.google.com/file/d/10EYe040qVW6cfygSZz6HwGQDylahQNSa'
GOOGLE_DRIVE_FILE_ID=$(echo $CHECKPOINT_GOOGLE_DRIVE_URL | rev | cut -d'/' -f1 | rev)
CONFIRM=$(wget --quiet --save-cookies googlecookies.txt --keep-session-cookies --no-check-certificate "https://docs.google.com/uc?export=download&id=$GOOGLE_DRIVE_FILE_ID" -O- | sed -rn 's/.*confirm=([0-9A-Za-z_]+).*/\1\n/p')
wget --load-cookies googlecookies.txt "https://docs.google.com/uc?export=download&confirm=$CONFIRM&id=$GOOGLE_DRIVE_FILE_ID" -O w2l_plus_large_mp.tar.gz || rm googlecookies.txt # from https://gist.github.com/vladalive/535cc2aff8a9527f1d9443b036320672

# download the official NVidia's wav2letter++ model checkpoint from Google Drive via the link they provide
CHECKPOINT_GOOGLE_DRIVE_URL='https://drive.google.com/file/d/12CQvNrTvf0cjTsKjbaWWvdaZb7RxWI6X'
GOOGLE_DRIVE_FILE_ID=$(echo $CHECKPOINT_GOOGLE_DRIVE_URL | rev | cut -d'/' -f1 | rev)
CONFIRM=$(wget --quiet --save-cookies googlecookies.txt --keep-session-cookies --no-check-certificate "https://docs.google.com/uc?export=download&id=$GOOGLE_DRIVE_FILE_ID" -O- | sed -rn 's/.*confirm=([0-9A-Za-z_]+).*/\1\n/p')
wget --load-cookies googlecookies.txt "https://docs.google.com/uc?export=download&confirm=$CONFIRM&id=$GOOGLE_DRIVE_FILE_ID" -O jasper10x5_LibriSpeech_nvgrad_masks.tar.gz || rm googlecookies.txt

# the commands below will also work for jasper10x5_LibriSpeech_nvgrad_masks.tar.gz

# export model weights to PyTorch binary format
python3 tfcheckpoint2pytorch.py --checkpoint w2l_plus_large.tar.gz -o w2l_plus_large.pt

# export model weights to HDF5
python3 tfcheckpoint2pytorch.py --checkpoint w2l_plus_large_mp.tar.gz -o w2l_plus_large_mp.h5

# we must replace Horovod-related nodes by Identity, otherwise TensorFlow can't load the checkpoint
# https://github.com/horovod/horovod/issues/594

# print all variable names to help you identify input and output names
python3 tfcheckpoint2pytorch.py --checkpoint w2l_plus_large_mp.tar.gz --graph graph.txt \
    --identity Horovod

# export the model graph to TensorBoard logdir and open TensorBoard
# you must provide one or several input_name
python3 tfcheckpoint2pytorch.py --checkpoint w2l_plus_large_mp.tar.gz --tensorboard w2l_plus_large_mp.tensorboard \
    --identity Horovod --tensorboard w2l_plus_large_mp.tensorboard
    --input_name 'IteratorGetNext:0'
python3 -m tensorboard.main --logdir w2l_plus_large_mp.tensorboard

# we must force tf2onnx and ONNX to ignore some node attributes:
# https://github.com/onnx/tensorflow-onnx/issues/578
# https://github.com/onnx/onnx/issues/2090
    
# export model to ONNX. you must specify input and output variable names, tfcheckpoint2pytorch will try to infer input shapes and dtype
python3 tfcheckpoint2pytorch.py --checkpoint w2l_plus_large_mp.tar.gz --onnx w2l_plus_large_mp.onnx \
    --identity Horovod \
    --ignoreattr Toutput_types --ignoreattr output_shapes --ignoreattr output_types --ignoreattr predicate --ignoreattr f --ignoreattr dtypes  \
    --input_name 'IteratorGetNext:0' \
    --output_name 'ForwardPass/fully_connected_ctc_decoder/logits:0'
  
# you can also force input shapes and dtype
python3 tfcheckpoint2pytorch.py --checkpoint w2l_plus_large_mp.tar.gz --onnx w2l_plus_large_mp.onnx \
    --identity Horovod \
    --ignoreattr Toutput_types --ignoreattr output_shapes --ignoreattr output_types --ignoreattr predicate --ignoreattr f --ignoreattr dtypes  \
    --input_name 'IteratorGetNext:0' --input_shape -1 -1 64 --input_dtype half \
    --output_name 'ForwardPass/fully_connected_ctc_decoder/logits:0'