How do I use the subcommand tune when using the CLI?

[goncalomcorreia]

When I run:

python main.py tune -h

At the end of the output, we can read:

Runs routines to tune hyperparameters before training:
  --scale_batch_size_kwargs SCALE_BATCH_SIZE_KWARGS
                        Arguments for :func:`~pytorch_lightning.tuner.batch_size_scaling.scale_batch_size` (type: Union[Dict[str, Any], null], default: null)
  --lr_find_kwargs LR_FIND_KWARGS
                        Arguments for :func:`~pytorch_lightning.tuner.lr_finder.lr_find` (type: Union[Dict[str, Any], null], default: null)

I would like to run the learning rate finder. From the documentation, it seems lr_find takes as input a trainer and a model. How do I get those from the config?

I tried something like this and it didn't work:

python main.py tune --lr_find_kwargs {"model": mypackage.models.MyVAE}

Can someone share a working example of using the tune subcommand with the CLI?