ValueError: invalid literal for int() with base 10: ''

[tuqiangwang]

Traceback (most recent call last):
File "prepare_data.py", line 24, in
label_dict = pd.Series(labels, index = label_names) - 1
File "/home/tq/.local/lib/python3.5/site-packages/pandas/core/series.py", line 239, in init
data = list(data)
File "prepare_data.py", line 22, in
labels = map(lambda x: int(x), labels)
ValueError: invalid literal for int() with base 10: ''