Pytorch Lightning v1.7.7 support

[benjaminrwilson]

Describe your question

Hi,

Thank you for the great work! How difficult would be bumping pytorch_lightning to v1.7.7 (#5111)?

This would be quite helpful.

Thanks!

[rb-determined-ai]

This isn't very high priority for us right now.

Part of the reason is that our current PTL support hooks into some of the internals of PTL. Those internals are pretty unstable and actually supporting new versions is quite a bit of work for us.

Another part of the reason is that we have a new vision for the PTL support we would like to provide, and it involves supporting PTL at the Trainer level rather than at the LightningModule level. We think that will be more stable for us to maintain and also a much better experience for end-users. That work is a little down the road, as we're prioritizing a newer integration with Keras first.