Eval folder and its pth files

I have trained a model for 100 epochs and in the output directory there is a eval folder which contains 3 .pth files of about 7MB each. they are named as 000.pth, 050.pth and latest.pth.
I want to know what are they? is it generated because of train or valid or test data ? how is it different from checkpoint.pth and other weights? and why there is no information on the official website ?