connect dataset api to train-psy#2

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limorhe wants to merge 6 commits intomasterfrom

limorh-dataset-api

Commits on Jul 19, 2018

Commits on Jul 25, 2018

adding new stuff
svensht2
committed

Commits on Jul 26, 2018

connect input to train
limorhe
committed

Commits on Sep 25, 2018

work with smaller images in data set (avoid oom)
limorhe
committed

Commits on Oct 17, 2018

more updates
limorhe
committed