实现将txt中，原本按照sentence label存放的文本，如下图所示：
存放成按照每个单词及其对应label 为一行，一句话之后空一行的形式存放，如下图：
def sentence_to_two(file1,file2): # file是对应图一的地址，file2是对应图2的存放地址
f = open(file1,"r",encoding='utf-8')
f2 = open(file2,"w")
lines = f.readlines()
# print(lines)
j = 0
for line in lines:
sentence = line.strip().split("t")[0]
# print(sentence)
labels = line.strip().split("t")[1]
# print(label)
sentence_arr = sentence.strip().split(" ")
labels_arr = labels.strip().split(" ")
# print(arr)
i = 0
for word in sentence_arr:
f2.write(sentence_arr[i]+" "+labels_arr[i]+"n")
i = i+1
j = j+1
f2.write("n")
f.close()
f2.close()
