Before revision:  Inspired by the role of the prefrontal cortex (PFC) in hierarchical reasoning , we analyze this problem from a novel cognition perspective: learning a hierarchical cognitive structure of the highly-biased relationships and navigating that hierarchy to locate the classes , making the tail classes receive more attention in a coarse-to-fine mode.
After revision:  Inspired by the role of the prefrontal cortex (PFC) in hierarchical reasoning , we analyze this problem from a novel cognition perspective: learning a hierarchical cognitive structure of the highly-biased relationships and navigating that hierarchy to locate the relationships , making the tail classes receive more attention in a coarse-to-fine mode.