[Python] Interpolating with Hydra

I am using Hydra to organise configs for an ML project and I have my main config file along the lines of:

config.yaml

defaults:
- model: model_a
- _self_


then in

model/model_a.yaml

feature_dim: 106
block_args:
layer_1:
input_dim: ${feature_dim}
embed_dim: 64
output_dim: 64
layer_2:
...


expecting ${feature_dim} to get the value of 106 so I only have to change it in one place, but when I print the model config I get {'feature_dim': 106, 'block_args': {'layer_1': {'input_dim': '${feature_dim}', 'embed_dim': 64, 'output_dim': 64}, 'layer_2': ...}

This should be fairly simple and I don't understand why it's not working, any suggestions would be greatly appreciated!

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