基于词库的分词算法：正向最大匹配法，逆向最大匹配法，双向最大匹配法

# -*- coding: utf-8 -*-
"""
Created on Thu Nov 22 15:28:42 2018
NLP learning
@author: jack
"""

class IMM(object):
    def __init__(self,dic_path):
        self.dictionary = set()
        self.maximum= 0
        
        with open(dic_path,'r',encoding = 'utf-8') as f:
            for line in f:
                line = line.strip()
                if not line:
                    continue
                self.dictionary.add(line)
                self.maximum = len(line)
    #逆向最大匹配        
    def cut1(self,text):