My config file has a controller field that I manually set using CLI options: +controller=mpc. The controller is defined inside the controller group. The filename is mpc.yaml. The content is this:

_target_: ...
_partial_: True
communicator:
  _target_: ...
# learning_rate: !!float 0.5

The controller has an optional field learning_rate that defaults to None. I want to sweep over exactly this parameter.

I used the command python main.py +controller=mpc +controller/learning_rate=0.5. But it does not set the parameter. It adds key-value pair with the name controller/learning_rate. How can I sweep over the learning rate? For example with values 0.5,0.7.