[DISCUSSION] callbacks integration

[szymonmaszke]

Currently two tools (comet-ml and neptune.ai) are integrated as third party experiment savers/loggers.

Other tools we would like to integrate with:

• mlflow
• Weights & biases

You can see current work in callbacks module

TO-DO BEFORE 0.1.0 RELEASE:

• Integration tests before 0.1.0 release
• Implementation of the above two integrations

Other suggestions for similar integrations are more than welcome. Also if you have an idea for other non-experiment logging callbacks worth checking out (and possibly integrating), list those below as well, thanks.