Code request

Hi, I read this paper and tried to run your code, but I have the following problems:
1.The attention module is not used in the code , could you pleasse provide the code
2.Why the input network image size must be 1008 and 592, is the image size has any rules
3.the code about evaluation is empty
4.The URL for the DRIVE dataset seems to go to the STARE dataset
looking forwad to your reply!
Thanks!!!