Some minor fixes#2

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michelgokan wants to merge 13 commits intoflixpar:masterfrom

michelgokan:master

Commits on Oct 23, 2019

Commits on Oct 28, 2019

Commits on Nov 13, 2019

Commits on Nov 16, 2019

added basic logger for supervised experiment
flixpar
committed

Commits on Jan 31, 2020

Commits on Feb 4, 2020

Fixing an error in policy_networks.py related to wrong usage of dots instead of brackets when working with dictionaries (graph object)
michelgokan
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Replacing graph.num_nodes with x.size(0)
michelgokan
committed