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Multi-label classification by polytree-augmented classifier chains with label-dependent features
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DOI：10.1007/s10044-018-0711-6.png)
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Abstract
En 中文
Multi-label classification faces several critical challenges, including modeling label correlations, mitigating label imbalance, removing irrelevant and redundant features, and reducing the complexity for large-scale problems. To address these issues, in this paper, we propose a novel methodpolytree-augmented classifier chains with label-dependent featuresthat models label correlations through flexible polytree structures based on low-dimensional label-dependent feature spaces learned by a two-stage feature selection approach. First, a feature weighting approach is applied to efficiently remove irrelevant features for each label and mitigate the effect of label imbalance. Second, a polytree structure is built in the label space using estimated conditional mutual information. Third, an appropriate label-dependent feature subset is found by taking account of label correlations in the polytree. Extensive empirical studies on six synthetic datasets and 12 real-world datasets demonstrate the superior performance of the proposed method. In addition, by incorporating the proposed two-stage feature selection approach, the multi-label classifiers with label-dependent features achieve on average 9.4% performance improvement in Exact-Match compared with the original classifiers.
Keywords:
Multi-label classification
Label correlation
Polytree-augmented classifier chain
Label-dependent feature
Label imbalance
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