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Ord2Seq: Regarding Ordinal Regression as Label Sequence Prediction
Ordinal regression refers to classifying object instances into ordinal
categories. It has been widely studied in many scenarios, such as medical
disease grading, movie rating, etc. Known methods focused only on learning
inter-class ordinal relationships, but still incur limitations in
distinguishing adjacent categories thus far. In this paper, we propose a simple
sequence prediction framework for ordinal regression called Ord2Seq, which, for
the first time, transforms each ordinal category label into a special label
sequence and thus regards an ordinal regression task as a sequence prediction
process. In this way, we decompose an ordinal regression task into a series of
recursive binary classification steps, so as to subtly distinguish adjacent
categories. Comprehensive experiments show the effectiveness of distinguishing
adjacent categories for performance improvement and our new approach exceeds
state-of-the-art performances in four different scenarios. Codes are available
at https://github.com/wjh892521292/Ord2Seq.Comment: Accepted by ICCV202
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