port code to tensorflow2.0

[punitvara]

Compile and run code with tf2.0. Eager execution is
disabled. Tested code with python 3.5

Signed-off-by: Punit Vara punitvara@gmail.com

[punitvara]

Either #86 or this PR should get merged. Preferably this one. @adityakusupati Can you please review this ?

[adityakusupati]

I will try to set it up next week and test it out. @metastableB and @harsha-simhadri any thoughts? I think this is important for tf 2.0 transition.

[adityakusupati]

@punitvara , a couple of things

1. Bonsai example runs fine, but FastCells don't
2. Can you isolate the changes you made from the original files, this diff is very cumbersome to follow?

[punitvara]

Ok sure. I will push in tf directory once review is done I will create new PR with tf 2.0

[metastableB]

@adityakusupati I am of the opinion that we should hold out on this PR for a little bit longer till we have a clear view on what we are going to focus on; eager or static compilation. If you feel like going ahead with supporting static graphs with TF2.0, please do so. You can get a clean diff w.r.t tf/ directory by using the native diff command as explained here. You will have to go through it one file at a tile.

@punitvara Thanks for your contributions!

[cdknorow]

@metastableB I've been doing some work to do a port to tf2 for some functions (not using tf1.compat, but full tf2 with eager execution) I wouldn't mind putting together a PR for the work as I go through. But only if there is interest on your side.