 We characterize conditions on the metric entropy  such that oracle rates---rates of the same order as if we knew the nuisance model---are achieved.
<clarity>  We characterize conditions on the metric entropy  such that oracle rates---rates of the same order as if we knew the nuisance model---are achieved.
 We characterize conditions on the metric entropy such that oracle rates---rates of the same order as if we knew the nuisance parameter---are achieved.