我发现一个错误，希望你确认一下

[CCZGG]

def iter(self):
niter = 0
with open(self.filename) as f:
for line in f:
niter += 1
if self.max_iter is not None and niter > self.max_iter:
break
word_idx, pos1, pos2 = [], [], []
line = re.sub('###END###', '', line)
line = line.strip()
content = line.split()
ent1 = content[2]
ent2 = content[3]
relation = content[4]
if self.processing_relation is not None:
relation = self.processing_relation(relation)
sentence = line[5:] # 这里，我认为应该是 sentence = content[5]