#
ConsistencyDecoderScheduler

This scheduler is a part of the `ConsistencyDecoderPipeline` and was introduced in DALL-E 3.

The original codebase can be found at openai/consistency_models.

##
ConsistencyDecoderScheduler

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class diffusers.schedulers.ConsistencyDecoderScheduler

< source >

( num_train_timesteps: int = 1024 sigma_data: float = 0.5 )

####
scale_model_input

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( sample: FloatTensor timestep: Optional = None ) → `torch.FloatTensor`

Parameters

- sample (`torch.FloatTensor`) — The input sample.
- timestep (`int`, optional) — The current timestep in the diffusion chain.

Returns

`torch.FloatTensor`

A scaled input sample.

Ensures interchangeability with schedulers that need to scale the denoising model input depending on the current timestep.

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step

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( model_output: FloatTensor timestep: Union sample: FloatTensor generator: Optional = None return_dict: bool = True ) → `~schedulers.scheduling_consistency_models.ConsistencyDecoderSchedulerOutput` or `tuple`

Parameters

- model_output (`torch.FloatTensor`) — The direct output from the learned diffusion model.
- timestep (`float`) — The current timestep in the diffusion chain.
- sample (`torch.FloatTensor`) — A current instance of a sample created by the diffusion process.
- generator (`torch.Generator`, optional) — A random number generator.
- return_dict (`bool`, optional, defaults to `True`) — Whether or not to return a `~schedulers.scheduling_consistency_models.ConsistencyDecoderSchedulerOutput` or `tuple`.

Returns

`~schedulers.scheduling_consistency_models.ConsistencyDecoderSchedulerOutput` or `tuple`

If return_dict is `True`, `~schedulers.scheduling_consistency_models.ConsistencyDecoderSchedulerOutput` is returned, otherwise a tuple is returned where the first element is the sample tensor.

Predict the sample from the previous timestep by reversing the SDE. This function propagates the diffusion process from the learned model outputs (most often the predicted noise).