Abstract: Since the tourism text for destinations contains semantic noise and different scenic spots, which can not be displayed intuitively, a new scenic spots-topic model based on the probabilistic topic model was proposed. The model assumed that one document included several scenic spots with correlation, and a special scenic spot named "global scenic spot" was introduced to filter the semantic noise. Then Gibbs sampling algorithm was employed to learn the maximum a posteriori estimates of the model and get a topic distribution vector for each scenic spot. A clustering experiment was conducted to indirectly evaluate the effects of the model and analyze the impact of "global scenic spot" on the model. The result shows that the proposed model has better effect than baseline model such as TF-IDF (Term Frequency-Inverse Document Frequency) and Latent Dirichlet Allocation (LDA), and the "global scenic spot" can improve the modeling effect significantly. Finally, scenic spots association graph was employed to display the result visually.

Key words: probabilistic topic model, tourism text, noise, Gibbs sampling, visualization

摘要： 针对旅游文本噪声多、景点多且展示不直观的问题，提出一种基于概率主题模型的景点-主题模型。模型假设同一篇文档涉及多个具有相关关系的景点，引入“全局景点”过滤噪声语义，并利用Gibbs采样算法估计最大似然函数的参数，获取目的地景点的主题分布。实验通过对景点主题特征进行聚类，评估聚类效果从而间接评价模型训练效果，并定性分析“全局景点”对模型的作用。实验结果表明，该模型对旅游文本的建模效果优于基准算法TF-IDF与隐含狄利克雷分布（LDA），且“全局景点”的引入对建模效果有明显的改善作用。最后通过景点关联图的方式对实验结果进行可视化展示。

关键词: 概率主题模型, 旅游文本, 噪声, Gibbs采样, 可视化