Few-shot learning has made impressive strides in addressing the crucial challenges of recognizing unknown samples from novel classes in target query sets and managing visual shifts between domains. However, existing techniques fall short when it comes to identifying target outliers under domain shifts by learning to reject pseudo-outliers from the source domain, resulting in an incomplete solution to both problems. To address these challenges comprehensively, we propose a novel approach called Domain Adaptive Few-Shot Open Set Recognition (DA-FSOS) and introduce a meta-learning-based architecture named DAFOSNET. During training, our model learns a shared and discriminative embedding space while creating a pseudo open-space decision boundary, given a fully-supervised source domain and a label-disjoint few-shot target domain. To enhance data density, we use a pair of conditional adversarial networks with tunable noise variances to augment both domains closed and pseudo-open spaces. Furthermore, we propose a domain-specific batch-normalized class prototypes alignment strategy to align both domains globally while ensuring class-discriminativeness through novel metric objectives. Our training approach ensures that DAFOS-NET can generalize well to new scenarios in the target domain. We present three benchmarks for DA-FSOS based on the Office-Home, mini-ImageNet/CUB, and DomainNet datasets and demonstrate the efficacy of DAFOS-NET through extensive experimentation

我们提出了一种新颖的方法，称为域自适应少样本开放集识别（DA-FSOS），并引入了一种基于元学习的架构命名为DAFOSNET。我们的模型通过在给定完全监督的源域和标签独立的少样本目标域的情况下创建伪开放空间决策边界来学习共享和可区分的嵌入空间，并使用一对具有可调噪声方差的条件对抗网络来增强数据密度。此外，我们提出了一种特定于域的批归一化类原型对齐策略，通过新的度量目标在全局上对齐两个域，同时确保类别辨别性。我们基于Office-Home、mini-ImageNet/CUB和DomainNet数据集提出了DA-FSOS的三个基准，并通过广泛的实验验证了DAFOSNET的有效性。

领域自适应几样本开放集学习