Confusion related to precise_bn step

Hi,

First of all, thanks for this wonderful repo.

I am taking inspirations from your repo and building my own on custom dataset and models. I have a doubt related the the `precise_bn` step. Lets say, I am not using `distributed dataparallel` and using `dataparallel`. So, in this case do I need to call `misc.aggregate_sub_bn_stats(model)`? As, I don't need to aggregate explicitly when using 'dataparallel'.

Thanks in advance.