ValueError when `to('cuda')` on Value-guided planning pipeline

[hilookas]

Describe the bug

When I run the Value-guided planning pipeline colab https://colab.research.google.com/drive/1rXm8CX4ZdN5qivjJ2lhwhkOmt_m0CvU0 with to('cuda') to speed up the diffusion process. It gave me a ValueError.

Reproduction

https://colab.research.google.com/drive/1SFl7daLQxd8QyHJP6ndSPznSFX2rppQ2 Code block 24 pipeline.to(DEVICE)

Logs

ValueError: ValueGuidedRLPipeline {
 "_class_name": "ValueGuidedRLPipeline",
 "_diffusers_version": "0.25.0.dev0",
 "_name_or_path": "bglick13/hopper-medium-v2-value-function-hor32"
}
 has been incorrectly initialized or <class 'diffusers.experimental.rl.value_guided_sampling.ValueGuidedRLPipeline'> is incorrectly implemented. Expected {'env', 'unet', 'value_function', 'scheduler'} to be defined, but dict_keys([]) are defined.

System Info

colab

Who can help?

@yiyixuxu

[hilookas]

I add a Fix. A nice working example is here: https://colab.research.google.com/drive/1DjKaP7Vt8Tv4cVBfdoYPAb3BB5JyT9v2

Modified from https://colab.research.google.com/drive/1rXm8CX4ZdN5qivjJ2lhwhkOmt_m0CvU0 which is linked from https://huggingface.co/docs/diffusers/main/en/api/pipelines/value_guided_sampling
Original Notebook: https://colab.research.google.com/github/huggingface/notebooks/blob/main/diffusers/reinforcement_learning_with_diffusers.ipynb When this pr is accepted, I will update this notebook as well.

[hilookas]

This fix is similar to #5993 and was inspired by https://huggingface.co/docs/diffusers/main/en/using-diffusers/contribute_pipeline