Interpolations in dictionary keys

[colobas]

Is your feature request related to a problem? Please describe. In situations where you have several related dicts with the same keys, it would be nice to be able to define those only once somewhere an interpolate them into all the dictionary keys, to avoid errors and repetition. It would also allow one to override the corresponding keys in all the dicts at once.

Describe the solution you'd like Being able to to something like:

model:
  x_label: image
  y_label: class
  id_column: index
  network:
    _target_: my_pkg.my_network.Network
 
data:
  ${model.id_column}:
    _target_: my_pkg.load_col_from_dataframe    # some custom function
    _partial_: true
    col: ${model.id_column}
  ${model.y_label}:
    _target_: my_pkg.load_col_from_dataframe
    _partial_: true
    col: ${model.y_label}
  ${model.x_label}:
    _target_: my_pkg.load_image_from_dataframe
    _partial_: true
    path_col: ${model.x_label} 

(This is a simplified version of what I do in serotiny

Describe alternatives you've considered No really good alternatives other than manually making sure the values match.

Additional context I would use this feature heavily in the context of a project I'm working on: https://github.com/allencell/serotiny