Dark Knowledge Balance Learning for Unbiased Scene Graph Generation

One of the major obstacles that hinders the current scene graph generation (SGG) performance lies in the severe predicate annotation bias. Conventional solutions to this problem are mainly based on reweighting/resampling heuristics. Despite achieving some improvements on tail classes, these methods are prone to cause serious performance degradation of head predicates. In this paper, we propose to tackle this problem from a brand-new perspective of dark knowledge. In consideration of the unique nature of SGG that requires a large number of negative samples to be employed for predicate learning, we design to capitalize on the dark knowledge contained in negative samples for debiasing the predicate distribution. Along such vein, we propose a novel SGG method dubbed Dark Knowledge Balance Learning (DKBL). In DKBL, we first design a dark knowledge balancing loss, which helps the model learn to balance head and tail predicates while maintaining the overall performance. We further introduce a dark knowledge semantic enhancement module to better encode the semantics of predicates. DKBL is orthogonal to existing SGG methods and can be easily plugged into their training process for further improvement. Extensive experiments on VG dataset show that the proposed DKBL can consistently achieve well trade-off performance between head and tail predicates, which is significantly better than previous state-of-the-art methods. The code is available in https://github.com/chenzqing/DKBL.