The standard deviation of the data distribution. This is set to 0.5 in the EDM paper [1].
sigma_schedule (`str`, *optional*, defaults to `karras`):
Sigma schedule to compute the `sigmas`. By default, we the schedule introduced in the EDM paper
(https://arxiv.org/abs/2206.00364). Other acceptable value is "exponential". The exponential schedule was
incorporated in this model: https://huggingface.co/stabilityai/cosxl.
num_train_timesteps (`int`, defaults to 1000):