Enable Minigo for TensorFlow 2.0

[trollyxia]

Hi, is there a plan for Minigo to support for TensorFlow 2.0?

[amj]

@brilee do you know of any plans?

[brilee]

Don't have bandwidth to do this migration at the moment. After 2.0 officially launches I might have time.

[delock]

2.0 is about to officially launch. Is there any change of status? What is the main obstacle for moving to TF2.0? I see absl version conflict might be a reason, is it correct?

[tommadams]

No change of status right now.

We have higher priorities at the moment and not enough time to work on an upgrade.

For one thing, we'll need to update all of our Python code because the APIs have apparently changed quite substantially. We also need to update to the latest TF 1.14 release before upgrading to 2.0. I look at that briefly a couple of weeks ago and they had made a number WORKSPACE changes since 1.13.1 that broke our project configuration.