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Convolutional neural network architecture of the models: (a) placental segmentation (PS) model; (b) the dual pathway (T - top; B - bottom pathway) hybrid (HB) model, where T encodes the PS model. The architectures of the multi-class (MC) and multi-class transfer learning (MCTL) models are not shown as they are identical to Fig 1a except for having four channels instead of two in the layer before softmax.
