错误提示：

Traceback (most recent call last):
File "/home/chenzhuohan/PycharmProjects/learning/movie_suggest_paddlepaddle.py", line 236, in
train_loop()
File "/home/chenzhuohan/PycharmProjects/learning/movie_suggest_paddlepaddle.py", line 185, in train_loop
plot_cost.append(train_prompt, batch_id, outs[0])
File "/home/chenzhuohan/PycharmProjects/learning/venv/lib/python3.6/site-packages/paddle/utils/plot.py", line 75, in append
assert isinstance(title, basestring)
NameError: name 'basestring' is not defined

运行环境：

ubuntu版本：18.04.2   虚拟机版本：VM14  paddpaddle版本：paddlepaddle.fluid.1.3（cpu） IPython7.3.0  python版本：3.6