Learning to Contrast the Counterfactual Samples for Robust Visual Question Answering
In the task of Visual Question Answering (VQA) most state of the art models tend to learn spurious correlations in the training set and achieve poor performance in out of distribution test data. Some methods of generating counterfactual samples have been proposed to alleviate this problem. However, the counterfactual samples generated by most previous methods are simply added to the training data for augmentation and are not fully utilized. Therefore, we introduce a novel self supervised contrastive learning mechanism to learn the relationship between original samples, factual samples and counterfactual samples. With the better cross modal joint embeddings learned from the auxiliary training objective, the reasoning capability and robustness of the VQA model are boosted significantly. We evaluate the effectiveness of our method by surpassing current state of the art models on the VQA CP dataset, a diagnostic benchmark for assessing the VQA model's robustness.
EMNLP