Pre-trained models in particular are allowed for this challenge as long as they can be released under an Open Source License. If you do use a pre-trained model, please make sure to share in this thread for the rest of the community.
@datascience_gdpl Good news, all prize winning solutions will be shared under an open source license. Stay tuned as we verify the winners. The repo with winning approaches will live here and be shared with the DrivenData email list.