Loading the original format checkpoints is supported via `from_single_file` method in the StableCascadeUNet.  
```python
import torch
from diffusers import (
StableCascadeDecoderPipeline,
StableCascadePriorPipeline,
StableCascadeUNet,
)

prompt = "an image of a shiba inu, donning a spacesuit and helmet"
negative_prompt = ""