Update Lightning compatibility with PyTorch 1.2.0

[williamFalcon]

Is your feature request related to a problem? Please describe.
PyTorch 1.2.0 has breaking changes for the experiment object.
Likely underlying changes to SummaryWriter.

For now, Lightning requires pytorch 1.1.0 but need to update compatibility.

[williamFalcon]

@Borda apparently 1.2.0 came out a few hours ago which is breaking the summaryWriter... fixed the pytorch version for now to 1.1.0 unitl i sort that out (thus the 0.4.1 update...)

[cwerner]

Hm, I just downgraded torch to 1.1 but I still have problems with Experiment. I'm not getting any output for TensorBoard. Are there some more examples I could look at?

[williamFalcon]

you’re probably on a jupyter notebook. tensorbord and jupyter have issues

[cwerner]

I am indeed. Bummer... So no jupyterlab + TensorBoard for now?

[williamFalcon]

@cwerner yeah, maybe in this new version PT just released. update to 1.2.0 and lighting 0.4.2 to see what happens. they changed summaryWriter quite a bit

[cwerner]

Cool. Will do. Thanks 🙏

[Borda]

Sorry, I don't have connection now..

[cwerner]

@williamFalcon just a heads-up. Still no output in Lightning, but it get tb output if I use summarywriter directly in my PyTorch Code from jupyterlab (on Port 6006, not in the extension). Could be that I do miss something in the lightning code?!

[williamFalcon]

@cwerner ok, i need to look into this bc Experiment IS a SummaryWriter as well.

Can you post code with both?

But at a minimum i can make it so SummaryWriter can just be used directly. That way we can start the process to support other loggers.

[cwerner]

Will be of my machine for a few days but will update and try. If I still have issues I’ll post some code here...