1. Max-Planck Institute for Informatics & German Research Center for Artificial Intelligence (DFKI), Saarbrücken, Germany
2. University of Iowa, Iowa City, IA, USA
3. Aalto University, Espoo, Finland
4. Aalto University & NVIDIA Research, Espoo & Helsinki, Finland
5. Saarland University & German Research Center for Artificial Intelligence (DFKI), Saarbrücken, Germany