This is an implementation of Opinosis

Reference:
   Kavita Ganesan, ChengXiang Zhai, Jiawei Han. Opinosis: A Graph Based Approach to Abstractive Summarization of Highly Redundant Opinions. In Proceedings of the 23rd International Conference on Computational Linguistics (COLING 2010). Beijing, China.

External Dependency:
    1 NetworkX
    2 scikits.learn

TODO:
    1 Modify it to suit Chinese.
    2 Modify the remove_duplicates and stitch part to improve the summary.