  Transductive Zero-shot learning (ZSL) targets to recognize the unseen
categories by aligning the visual and semantic information in a joint embedding
space. There exist four kinds of domain biases in Transductive ZSL, i.e.,
visual bias and semantic bias between two domains and two visual-semantic
biases in respective seen and unseen domains, but existing work only focuses on
the part of them, which leads to severe semantic ambiguity during the knowledge
transfer. To solve the above problem, we propose a novel Attribute-Induced Bias
Eliminating (AIBE) module for Transductive ZSL. Specifically, for the visual
bias between two domains, the Mean-Teacher module is first leveraged to bridge
the visual representation discrepancy between two domains with unsupervised
learning and unlabelled images. Then, an attentional graph attribute embedding
is proposed to reduce the semantic bias between seen and unseen categories,
which utilizes the graph operation to capture the semantic relationship between
categories. Besides, to reduce the semantic-visual bias in the seen domain, we
align the visual center of each category, instead of the individual visual data
point, with the corresponding semantic attributes, which further preserves the
semantic relationship in the embedding space. Finally, for the semantic-visual
bias in the unseen domain, an unseen semantic alignment constraint is designed
to align visual and semantic space in an unsupervised manner. The evaluations
on several benchmarks demonstrate the effectiveness of the proposed method,
e.g., obtaining the 82.8%/75.5%, 97.1%/82.5%, and 73.2%/52.1% for
Conventional/Generalized ZSL settings for CUB, AwA2, and SUN datasets,
respectively.
