How to share configurations that are one level above the configuration using it?

[akkiokun]

Hello everyone,

I have the following directory structure:

d-- data_loader_config
f---- dl_config.yaml
d-- pretrain_config
f---- pt_config.yaml
d-- finetune_config
f---- ft_config.yaml
main_config.yaml

# pt_config.yaml
_target_: custom.PtConfig
defaults:
  - ../data_loader_config: dl_config

# ft_config.yaml
_target_: custom.FtConfig
defaults:
  - ../data_loader_config: dl_config

# main_config.yaml
_target_: custom.MainConfig
defaults:
  - pretrain_config: pt_config
  - finetune_config: ft_config

What is the best way to use a shared configuration that is located outside the configuration directory where it is used? What would be a better approach for this case without any kind of duplication?

Thank you very much in advance.