Update Pytorch model (weights) version from 4 to 3 (It a shell script you can use inside your Kaggle kernel (using the `%%bash` magic)

downgrade-pytorch-model-version-from-4-to-3.sh

%%bash
apt-get install -y xarchiver || true
SAVED_MODEL_PATH=$(realpath "/kaggle/input/[/path/to/model/folder]")
NEW_MODEL_PATH=$(realpath "/kaggle/working")
for model_file in $(ls $SAVED_MODEL_PATH/*.pth)
do
    just_filename=$(basename "${model_file%.*}")
    version_filename_with_path="$(unzip -t  $model_file | grep version | awk '{print $2}')"
    if [[ ! -e "$NEW_MODEL_PATH/$just_filename.pth" ]]; then
        echo "Copying $model_file to $NEW_MODEL_PATH"
        cp $model_file /tmp
        cd /tmp/
        mkdir -p $(dirname $version_filename_with_path)
        echo 3 > $version_filename_with_path
        echo ""
        zip -u  $just_filename.pth $version_filename_with_path
        rm -fr $(dirname $version_filename_with_path)
        echo "Moving model file $just_filename.pth to $NEW_MODEL_PATH"
        mv $just_filename.pth $NEW_MODEL_PATH/$just_filename.pth
    fi
    echo "(After) Contents of '$version_filename_with_path' in the model file '$model_file'"
    unzip -p $NEW_MODEL_PATH/$(basename $model_file) $version_filename_with_path
done
echo "Your new model path is $NEW_MODEL_PATH, where you will find all the copied models (*.pth)"