我正在使用Windows 10从here尝试Tensorflow for Poets。当我运行此代码时，我遇到了麻烦：
python retrain.py
\--bottleneck_dir=tf_files/bottlenecks
\--how_many_training_steps=500
\--model_dir=tf_files/models/
\--summaries_dir=tf_files/training_summaries/%ARCHITECTURE%
\--output_graph=tf_files/retrained_graph.pb
\--output_labels=tf_files/retrained_labels.txt
\--architecture=%ARCHITECTURE%
\--image_dir=tf_files/flower_photos
这是我得到的错误
FutureWarning: Conversion of the second argument of issubdtype from `float` to `np.floating` is deprecated. In future, it will be treated as `np.float64 == np.dtype(float).type`.
from ._conv import register_converters as _register_converters
ERROR:tensorflow:Image directory '' not found.
Traceback (most recent call last):
File "retrain.py", line 1326, in <module>
tf.app.run(main=main, argv=[sys.argv[0]] + unparsed)
File "\Anaconda3\lib\site-packages\tensorflow\python\platform\app.py", line 126, in run
_sys.exit(main(argv))
File "retrain.py", line 989, in main
class_count = len(image_lists.keys())
AttributeError: 'NoneType' object has no attribute 'keys'
我该如何解决？我已经尝试过升级和降级Anaconda，Tensorflow和Python。