说明：  提供Markov的ppt讲稿，很系统。Markov网络是一个无向图，它可进行不确定性的知识推理，无向边可解释词间相关性，通过Markov网络学习机制获得词的相关信息。
(provide the ppt script, very systematic. Markov network is an undirected graph, it could be the uncertainty of knowledge, reasoning, No words can explain to the edge between relevance, through Markov network learning mechanism words of relevant information.)