[ADD] Allow retrieving internals from the forward pass#3
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Also raise an exception for invalid phases
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This PR introduces a new flag
internalstoget_batch_loss_and_accuracy_funcwhich allows to create a closure that also returns internal tensors of the forward pass (like inputs, labels, model output). These will be helpful for debugging, as well as implementing optimizer functionality (e.g. GGN-vector products that require the model output).Should be merged after #2 as it is branched from this PR.