Opinion mining is becoming one of the research highlights and the control of internet public opinion is also hot research topic. A new kind of tree which is called opinion tree has been proposed and defined. The flexible opinion mining model based on opinion tree is created and thus coarse-grained, medium-size and fine-grained (three different granularities) opinion mining are all realized in one unified flexible model. The flexible opinion mining procedure is set for internet public opinions. Finally, an experiment about how to build the opinion tree is finished, and the overall opinions about one hot topic in the internet is formed in the opinion tree.
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