def METHOD_NAME(self):
    # per_slot_reduce() is an opportunity to do any calculations on for a single worker before
    # passing them across the network for the final cross_slot_reduce operation.  In the case
    # of our F1 score, the update() function very efficient and there is nothing useful to do
    # here, so we just pass the per-class TP/FP/FN across the network for the cross_slot_reduce.
    return self.true_positives, self.false_positives, self.false_negatives