Why there is no property self.trainer.is_first_batch?

[youngzhou1999]

Hi, I'm curious about why no is_first_batch in trainer.
It's so fluent to use self.trainer.is_last_batch to judge the end of one epoch just as you guys post on tutorial. However, I found that there is no property is_first_batch in trainer.
what I'm now doing is set a metric for every epoch and compute it when one epoch ends. For exampe, I want to compute the whole training data's accuracy over sth. But I'm stuck with the start point of epoches. Is ther any suggestions to get the first batch of an epoch for solving the problem?
In my opinion, It's convenient to add the property of self.trainer.is_first_batch so that I can achieve what I want.

[semaphore-egg]

Maybe testing batch_idx==0 is simple enough for this purpose.

[youngzhou1999]

ohh! It seems easy and reasonale.