specializing configs (conditional statements)

[danbider]

I've read the docs here.

Still trying to figure out how can I do something like

single_frame:
  train:
    sequence_length: 16 
    step: ${sequence_length} # step = sequence_length by default
    batch_size: 1 # default, can't be changed
    random_shuffle: True

this returns:

single_frame': {'train': {'sequence_length': 16, 'step': '${sequence_length}', 'batch_size': 1, 'random_shuffle': True}

but I want step: 16.
how should i go about it?

[Jasha10]

You'll probably want to use a relative interpolation ${.sequence_length} instead of an absolute path ${sequence_length}. See the OmegaConf docs on Variable interpolation.
The following script works for me:

from omegaconf import OmegaConf

yaml_data = """
single_frame:
  train:
    sequence_length: 16 
    step: ${.sequence_length} # step = sequence_length by default
    batch_size: 1 # default, can't be changed
    random_shuffle: True
"""
config = OmegaConf.create(yaml_data)
assert config.single_frame.train.step == 16

See also OmegaConf.resolve.