TF2 is by default not enabled?

NeurIPS 2020: Procgen Competition
#1

Adding the following code to this line of train.py

from tensorflow.python import tf2
print(tf2.enabled())
assert False

it prints False. Is there any way to enable tf2?

#2

It seems that TF2.x is reduced to TF1.x in procgen competition.

#3

I see. But why should it be restricted to TF1.x even though I’ve set framework=tfe in the yaml file?