t (classes of latent pixels) is converted to embeddings and has positional
embeddings applied, see ImagePositionalEmbeddings. Then apply standard transformer action. Finally, predict
classes of unnoised image.
Note that it is assumed one of the input classes is the masked latent pixel. The predicted classes of the unnoised
image do not contain a prediction for the masked pixel as the unnoised image cannot be masked.

forward

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hidde