def __init__(self, sent_node_list, sent_vec_list):
        # self.graph_map = graph_map
        self.sent_node_list = sent_node_list
        self.sent_vec_list = sent_vec_list
        self.var_node_list = []
        for ii in xrange(len(self.sent_node_list)):
            self.var_node_list.append(VarNode(ii, self.sent_node_list[ii]))
        self.sim_matrix = [[1 for i in range(len(sent_node_list))] for j in range(len(sent_node_list))]
        # cal sim mat
        if len(self.sent_node_list) > 0:
            for q in xrange(len(self.sent_node_list)):

                for j in xrange(q + 1, len(self.sent_node_list)):
                    sm = cal_sim_tfidf(self.sent_node_list[q].sent, self.sent_node_list[j].sent)
                    self.sim_matrix[q][j] = sm
                    self.sim_matrix[j][q] = self.sim_matrix[q][j]
                    if sm > 0.2:
                        self.var_node_list[q].add_neighbor(self.var_node_list[j])
                        self.var_node_list[j].add_neighbor(self.var_node_list[q])
 def cal_sim_matrix(self):
     if len(self.observ_list) > 0:
         for i in xrange(len(self.sent_vec_list)):
             for j in xrange(i, len(self.sent_vec_list)):
                 self.sim_matrix[i][j] = cal_sim_tfidf(self.sent_list[i], self.sent_list[j])
                 self.sim_matrix[j][i] = self.sim_matrix[i][j]