valid_step in training epochs

[Davidwhw]

The verification step between training multiple epochs does not appear to be implemented in minigpt's code (such as lavis valid_step).
Is the author considering adding this feature?
Or can you give me some relevant suggestions, such as which code and methods should be changed? (Maybe it's evaluation in minigpt4/tasks/image_text_pretrain.py ?)
I tried to change the following files related to running validation in training:
minigpt4/datasets/builders/image_text_pair_builder.py
minigpt4/datasets/datasets/dataloader_utils.py
But this seems to just load the validation data set without getting into the process of running the validation.