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Multilabel categorization, which is more difficult but practical than the conventional binary and multiclass categorization, has received a great deal of attention in recent years. This paper proposes a novel probabilistic generative model, label correlation mixture model (LCMM), to depict the multiply labeled documents, which can be used for multilabel spoken document categorization as well as multilabel text categorization. In LCMM, labels and topics have the one-to-one correspondences. The LCMM consists of two important components: 1) a label correlation model and 2) a multilabel conditioned document model. The label correlation model formulates the generating process of labels where the dependences between the labels are taken into account. We also propose an efficient algorithm for calculating the probability of generating an arbitrary subset of labels. The multilabel conditioned document model can be regarded as a supervised label mixture model, in which labels for a document are known. Each label is characterized by distributions over words. For the parameter learning of the multilabel conditioned document model, in addition to maximum-likelihood estimation, a discriminative approach based on the minimum classification error rate training is proposed. To evaluate LCMM, extensive multilabel categorization experiments are conducted on a spoken document data set and three standard text data sets. The experimental results in comparison with other competitive methods demonstrate the effectiveness of LCMM.

Label Correlation Mixture Model: A Supervised Generative Approach to Multilabel Spoken Document Categorization