Make dual_net.py model setup more verbose (#291)
Make dual_net.py model setup more verbose (#291)

* Make dual_net.py setup more verbose

Model setup has numerous ambiguities this change aim to make our
decisions more obvious. A future PR will likely modify some of these
parameters.

tensorflow/minigo,tensorflow/minigo,tensorflow/minigo,tensorflow/minigo,tensorflow/minigo,tensorflow/minigo