  In many real-world applications, face recognition models often degenerate
when training data (referred to as source domain) are different from testing
data (referred to as target domain). To alleviate this mismatch caused by some
factors like pose and skin tone, the utilization of pseudo-labels generated by
clustering algorithms is an effective way in unsupervised domain adaptation.
However, they always miss some hard positive samples. Supervision on
pseudo-labeled samples attracts them towards their prototypes and would cause
an intra-domain gap between pseudo-labeled samples and the remaining unlabeled
samples within target domain, which results in the lack of discrimination in
face recognition. In this paper, considering the particularity of face
recognition, we propose a novel adversarial information network (AIN) to
address it. First, a novel adversarial mutual information (MI) loss is proposed
to alternately minimize MI with respect to the target classifier and maximize
MI with respect to the feature extractor. By this min-max manner, the positions
of target prototypes are adaptively modified which makes unlabeled images
clustered more easily such that intra-domain gap can be mitigated. Second, to
assist adversarial MI loss, we utilize a graph convolution network to predict
linkage likelihoods between target data and generate pseudo-labels. It
leverages valuable information in the context of nodes and can achieve more
reliable results. The proposed method is evaluated under two scenarios, i.e.,
domain adaptation across poses and image conditions, and domain adaptation
across faces with different skin tones. Extensive experiments show that AIN
successfully improves cross-domain generalization and offers a new
state-of-the-art on RFW dataset.
