Fix some small things

[tolgacangoz]

Proposes to fix #10

1. This pull request updates the cc12m_256x256.yaml and cc12m_1024x1024.yaml files by adding a diffusion_config section because samplers are created with diffusion_config.sampler_config:
   

   ml-mdm/ml_mdm/diffusion.py

   Line 94 in 3695917

   self.sampler = samplers.Sampler(diffusion_config.sampler_config)

   
   

   ml-mdm/ml_mdm/diffusion.py

   Line 287 in 3695917

   self.sampler = samplers.NestedSampler(diffusion_config.sampler_config)

2. Also, diffusion_config.no_use_residual is needed:
   

   ml-mdm/ml_mdm/diffusion.py

   Line 262 in 3695917

   if not self.diffusion_config.no_use_residual:

3. None in the file is read by 'None' -as a string.

Proposes to fix #6

Fixes old module mimicry.

This pull request proposes a refactoring of the samplers.py file to ensure correct handling of scaling when the config.schedule_shifted flag is set to True. This change improves the behavior of the code, especially for higher resolutions.

Prompt = a blue jay stops on the top of a helmet of Japanese samurai, background with sakura tree
Guidance scale = 7.5
Thresholding = clip
Number of steps = 250

Before 1024x1024	After 1024x1024

@MultiPath @Shuangfei @luke-carlson

[luke-carlson]

Looks good to me so far, PR is undergoing internal review now

[MultiPath]

#21

Thanks @tolgacangoz I think your PR fixed most of the issues. Please check the above my proposal (i think it did not fix the typos you mentioned)

[tolgacangoz]

This PR now fixes some small nits.