nal sigma is set to 0.   lambda_min_clipped (float, defaults to -inf) —
Clipping threshold for the minimum value of lambda(t) for numerical stability. This is critical for the
cosine (squaredcos_cap_v2) noise schedule.   variance_type (str, optional) —
Set to “learned” or “learned_range” for diffusion models that predict variance. If set, the model’s output
contains the predicted Gaussian variance.   timestep_spacing (str, defaults to "linspace