The image paths in query_set.txt and gallery_set.txt are in the following format:

[PATH TO IRIS0405 DATASET]/[USER_ID]/[IMAGE_NAME].tiff

In query_set.txt:
Each [USER_ID] has 20 images. The first 10 images are left eye images. The last 10 images are right eye images.

In gallery_set.txt:
Each [USER_ID] has 10 images. The first 5 images are left eye images. The last 5 images are right eye images.