def read_file(input, max_rows=None):
count = 0
vocab = Vocabulary()
lines = []
with open(input, 'r') as infile:
while True:
if max_rows is not None:
if count > max_rows:
break
count += 1
line = infile.readline()
if not line:
print('EOF reached')
break
line = normalize_line(line)
vocab.add_sentence(line)
lines.append(line)
return lines, vocab
