training error --validation? and where is evaluation =dict (interval=1) mentioned in GETTING_STARTED.md ?

[puchen]

Hi，Thanks for your great work. I want to validation after each epoch in training process in solov2. so i try --validation,but it always have problem with out of memory after train one epoch. and i also see evaluation=dict(interval=1) mentioned in the getting_started.md , but i cannot find it in the code .what shoulud i do for validation after each epoch in training process? Thank you very much.