exp init: Revisit type="dl"

[daavoo]

Once iterative/dvclive#225 is solved, the live section will be deprecated in favor of using metrics and plots.

How should exp init behave when type="dl"?

[daavoo]

Would it make sense for type="dl" to generate:

stages:
  train:
    cmd: python train.py
    deps:
      - train.py
    metrics:
      - dvclive.json:
          cache: false
    plots:
      - dvclive/scalars:
          cache: false

Where dvclive would be replaced by the value passed to --live (if any) ?

[daavoo]

cc @dberenbaum @skshetry

[dberenbaum]

@daavoo Would you be up to contribute this change?

[daavoo]

@daavoo Would you be up to contribute this change?

If you all agree on proposed workaround, yes

[dberenbaum]

Sorry, I think I was too quick to approve this. Looking at it now, it seems more transparent to:

• Make --live optional and off by default for both default and dl. This makes --type dl seem less useful since it only differs by including checkpoints, but I don't think it's bad that we are unifying and simplifying.
• Make --live independent from whether to include checkpoints: true.
• Make --live mutually exclusive with metrics and plots.
• If --live and --interactive are both present, don't ask for metrics or plots.

This hopefully makes it a simple convenience to replace metrics and plots easily when using dvclive.

Again, sorry for not catching this earlier.

Thoughts?