The datasets generated for training and validating each deep learning model along with trained model weights are available for download at the Google Drive link: https://tinyurl.com/happyplacenta or from Zenodo: 10.5281/zenodo.10535021 with no restrictions. Instructions can be found in the GitHub readme at: https://github.com/Nellaker-group/happy. The two histology slides used for graph model training are available for download under CC BY 4.0 from the BioImage Archive at 10.6019/S-BIAD1045. The remaining in-house placenta histology slides and clinical data are not made available in accordance with existing research ethics committee approvals and data transfer agreements. Pretrained ImageNet weights for the RetinaNet and ResNet-50 models were downloaded in code via PyTorch from https://download.pytorch.org/models/resnet101-5d3b4d8f.pth and https://download.pytorch.org/models/resnet50-0676ba61.pth and will be downloaded programmatically on first model use. Source data are provided with this paper.

Code is available at the following GitHub repository https://github.com/Nellaker-group/happy and at https://doi.org/10.5281/zenodo.10529239.

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