Sample fix

[jesperdlau]

I encountered some bugs while sampling. Maybe it's just me, but when instantiating the model in
src/walkjump/cmdline/_sample.py, The instantiate_model_for_sample_mode function doesn't seem to accept the DictConfig input. This is solved by either giving the specific inputs like
def instantiate_model_for_sample_mode( model_type, checkpoint_path, denoise_path) -> NoiseEnergyModel | DenoiseModel:

Or by instantiating the model by calling the function directly, like what is done with instantiate_redesign_mask and instantiate_seeds.

I also added some examples and comments.

[justinlubin]

Hey, I just wanted to say that this was a really helpful PR for me! I could get the model up and running with the changes you suggested. Thanks!

[justinlubin]

I also figured out that you need to specify the following option or something similar (e.g. in src/walkjump/hydra_config/sample.yaml) to enable sampling:

redesign_regions: ["L1", "L2", "H1", "H2"]

Otherwise, every index gets masked, and sampling never changes the seed values!