Use Pytorch DataLoader option

stable

working version, beta of SeenExamples metric

Bugfixes, not working code

bugfixes, current version not working

Support metric

translation to pytorch lightning of example

Fixate numpy version used in build (#659)

CI with Tensorflow 2.1 (#536)

Reduce the size of a rowgroup for mnist example.

Remove `transform` argument from `DataLoader`

Print better error messages for pytorch usage

Make factory method for creating reader

Force loading pyarrow before torch

Resurrect mnist examples. Reenabled tests.