say lambda times hidden representation of batch 1 plus 1 minus lambda of hidden representation of batch 2 and that is what you pass through the rest of the network right so basically you forward propagate to different batches until a certain layer here then you mix them with a random coefficient and then you pass it through the rest and then the only thing you also have to do is then at the end if you think of the labels of these two things you want to mix the labels in the same fashion so you want to mix lambda