We present a semi-supervised learning (SSL) method for building domain-specific language models (LMs) from general-domain data using probabilistic latent semantic analysis (PLSA). The proposed technique first performs topic decomposition (TD) on the combined dataset of domain-specific and general-domain data. Then it derives latent topic distribution of the interested domain, and derives domain-specific word n-gram counts with a PLSA style mixture model. Finally, it uses traditional n-gram

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... itional n-gram modeling to construct domain-specific LMs from the domain-specific word n-gram counts. Experimental results show that this technique outperforms both states-of-the-art relative entropy text selection and traditional supervised training methods. Index Terms-semi-supervised learning, language model, topic model.