命名实体识别别中bio转换为bmes

#文件读取 
path = r'要转换的bio文件的文件地址'
res_path = r'存放转换后文件的文件地址'

#将文件转为双层列表的结构
f = open(path,encoding='utf-8')
f1 = open(res_path,"w+",encoding='utf-8')
sentences = []
sentence = []
label_set = set()
cnt_line = 0
for line in f:

    cnt_line += 1
    if len(line) == 0 or line[0] == "\n":
        if len(sentence) > 0:
            sentences.append(sentence)
            # print(sentence)
            sentence = []
        continue
    splits = line.split(' ')
    sentence.append([splits[0], splits[-1][:-1]])
    label_set.add(splits[-1])

if len(sentence) > 0:
    sentences.append(sentence)
    sentence = []
f.close()

# 文件转换 存储文件
for sen in sentences:
    i = 0
    for index,word in enumerate(sen):
        char=word[0]
        label=word[1]
        if index<len(sen)-1:
            if(label[0]=='B'):
                if sen[index+1][1][0]=='I':
                    label=label
                elif sen[index+1][1][0]=='O':
                    label = 'S'+label[1:]
            elif (label[0]=='I'):
                if sen[index+1][1][0]=='I':
                    label = 'M'+label[1:]
                if sen[index+1][1][0]=='O' or sen[index+1][1][0]=='B':
                    label = 'E'+label[1:]      
            elif (label[0]=='O'):
                label = label
        else:
            if(label[0]=='B'):
                label = 'S'+label[1:]
            elif (label[0]=='I'):
                label = 'E'+label[1:]      
            elif (label[0]=='O'):
                label = label

            
        f1.write(f'{char} {label}\n')
    f1.write('\n')
f1.close()