Probabilistic Embeddings for Cross-Modal Retrieval

该研究提出了PCME(跨模态概率嵌入)方法,旨在解决一对多的对应关系问题。通过将样本表示为概率分布,PCME能够在视觉和文本嵌入中捕捉数据的固有不确定性。它包括视觉-文本联合嵌入、单域HIB(hedged instance embedding)和跨域PCME,其中涉及软对比损失、概率匹配和多样性处理。实验结果表明,这种方法能够产生更丰富的嵌入空间并有效处理不确定性。
基于对抗的跨媒体检索Cross-modal retrieval aims to enable flexible retrieval experience across different modalities (e.g., texts vs. images). The core of crossmodal retrieval research is to learn a common subspace where the items of different modalities can be directly compared to each other. In this paper, we present a novel Adversarial Cross-Modal Retrieval (ACMR) method, which seeks an effective common subspace based on adversarial learning. Adversarial learning is implemented as an interplay between two processes. The first process, a feature projector, tries to generate a modality-invariant representation in the common subspace and to confuse the other process, modality classifier, which tries to discriminate between different modalities based on the generated representation. We further impose triplet constraints on the feature projector in order to minimize the gap among the representations of all items from different modalities with same semantic labels, while maximizing the distances among semantically different images and texts. Through the joint exploitation of the above, the underlying cross-modal semantic structure of multimedia data is better preserved when this data is projected into the common subspace. Comprehensive experimental results on four widely used benchmark datasets show that the proposed ACMR method is superior in learning effective subspace representation and that it significantly outperforms the state-of-the-art cross-modal retrieval methods.
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