Add projectors to deepset #454
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This adds projectors after the MLPs in the DeepSet network.
Without these projectors an activation function is applied to the learnable residual.
However, it is preferable to not bound that residual from below.
I construct the MLPs with all specified widths but the last, then add a new dense layer of the last width.
Changing the MLPs and adding corresponding new projector attributes both breaks serialization. We could in principle detect checkpoints of the DeepSet old format and translate it, if we think this is worth the effort at this stage.