We analyze different queues to measure the extent of diversity that each queue introduces to training data during our normal self-training process  where, at every iteration, only instances of the designated queue are added to training data.
we compute the extent of diversity that each given queue introduces as follows: 1 − cosine(T e , concat(T e , Q e )) where, as before, T e and Q e indicate the representations of training and queue instances at episode e respectively, and concat(.,.)