To remove just pd-iemnet package itself from Debian 9 (Stretch) execute on terminal:
sudo apt-get remove pd-iemnet
Uninstall pd-iemnet and it's dependent packages
To remove the pd-iemnet package and any other dependant package which are no longer needed from Debian Stretch.
sudo apt-get remove --auto-remove pd-iemnet
If you also want to delete configuration and/or data files of pd-iemnet from Debian Stretch then this will work:
sudo apt-get purge pd-iemnet
To delete configuration and/or data files of pd-iemnet and it's dependencies from Debian Stretch then execute:
sudo apt-get purge --auto-remove pd-iemnet
More information about apt-get remove
apt-get remove is identical to install except that packages are removed instead of installed. Note that removing a package leaves its configuration files on the system. If a plus sign is appended to the package name (with no intervening space), the identified package will be installed instead of removed.