Fig. 2. t-SNE visualisation of tile embeddings produced by the IHC score MIL classifier on the test set images, with the vectors coloured according to the score of their respective slides.

Visual similarity of the tiles is reflected in their neural network-derived representations and the embeddings of similar tiles are close in the learned vector space. Coincidentally, there are no TMA images with a score of 1 in the test set because the test set consisted of the consecutive tumour cases that followed the training set cases.