segnet memory requirements

It is interesting to know segnet (based on caffe) actually requires lots of memory for training, like:

 

batch_size: 1
Memory required for data: 410930228
htop RES column ~4230Mb

batch_size: 2
Memory required for data: 821856308
htop RES column ~4683Mb

batch_size: 4
Memory required for data: 1643708468
htop RES column ~5598Mb

batch_size: 8
Memory required for data: 3287412788
htop RES column ~6597Mb (after 1st iteration 7261Mb) 

As pointed out here: 
https://github.com/alexgkendall/caffe-segnet/issues/21

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