Fix installation by pinning diffusers version to 0.9.0

[veeral-patel]

Thanks for this great project!

TLDR: Pin diffusers to 0.9.0 to fix install errors for new devs.
This should solve issues #161 #162 #160 #152
Similar to PRP #158, but that PR contains some auxiliary changes making CI fail

Problem

I reproduced not able to get my server running locally, with a fresh Riffusion download. I followed these steps:

virtualenv venv && source venv/bin/activate
pip install -r requirements.txt

And got this error:

  File "/Users/veeralpatel/dev/riffusion2/riffusion/riffusion_pipeline.py", line 14, in <module>
    from diffusers.pipeline_utils import DiffusionPipeline
ModuleNotFoundError: No module named 'diffusers.pipeline_utils'

Solution

I noticed pip is installing diffusers 0.24.0. I browsed the diffusers code. Looks like they refactored. We need to import DiffusionPipeline like this now:

from diffusers import DiffusionPipeline
# or
from diffusers.pipelines import DiffusionPipeline

I've just pinned diffusers to 0.9.0 which gets my server running fine.

(venv) riffusion git:main ❯ python -m riffusion.server --host 127.0.0.1 --port 3013                       ✹
/Users/veeralpatel/dev/riffusion3/riffusion/server.py:55: UserWarning: WARNING: cuda is not available, using cpu instead.
  PIPELINE = RiffusionPipeline.load_checkpoint(
WARNING: Falling back to float32 on cpu, float16 is unsupported
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