override default config to create multiple instances with different arguments

[jayleicn]

Hi Hydra experts!

I have a config that set arguments for a dataloader

dataloader:
   load_image: true
   load_text: true
   other_arguments ...

In my final config, I would have two dataloaders share very similar arguments except the value of load_image, one is true and another is false, i.e.,

dataloader_1:
   load_image: false
   load_text: true
   other_arguments ...

dataloader_2:
   load_image: true
   load_text: true
   other_arguments ...

I can directly create dataloader_1 and _2 by coping the shared parts, but since the dataloader config is quite lengthy (40+lines), this results in a lot of duplications. Is there a way to create a shared config dataloader, and have _1 and _2 inherit it and only override the value load_image?