I came across a couple of papers [1,2] where the authors experimented on the Toronto Face Database, which contains a large number of labelled and unlabelled images of faces with identity and expression labels. I can't seem to find the download links to this database anywhere. Does anyone know how to get access to it?
[1] Multi-Task Learning of Facial Landmarks and Expression
[2] Disentangling factors of variation for facial expression recognition
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