the meaning of dir_demo,dir_test in option.py

[Marshall-yao]

Hi, excuse me. I have some questions that may need your help.

1. I know the dir_data is DIV2K 800 training images path. Is dir_demo set5,set14 test set path?
   Could you give a explanation of dir_demo ?

2. data_test: The data_test is default 'DIV2K'. And how many valid images used to test? Is it same as EDSR , i.e 0801.png to 0810.png?
   In other words , whether it lacks the parameter of data_range in option.py？

Best regards