facebookresearch / facebookresearch/SlowFast

about FC layer output size

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![image](https://user-images.githubusercontent.com/14344027/76529096-c629c480-64ac-11ea-9694-29f0a155f443.png)

in head_helper.py ,when i training ,after x = self.projection(x),i get x size is sub_batch * 2 * 2*2*1,after x.view (x.shape[0], -1),x size is sub_batch*8, is right?why is it?

sub_batch = batch_size // gpu_num

thx

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