Fig. 3. Triplet network architecture and visualizations of the bone embedding distances it generates.

a Architecture of the Triplet network: three identical copies of the base network (VGG-16 or ResNet-50 followed by dimension-reducing, embedding-generating layers), followed by layers which compute embedding distances, loss, and accuracy. b t-SNE visualization of the embeddings generated by the Triplet network from the X-ray images of the 29 bones. c Principle component analysis visualization of the embeddings generated by the Triplet network from the X-ray images of the 29 bones.