Whether to use the uniform-logSNR for step sizes proposed by Lu's DPM-Solver in the noise schedule during
the sampling process. If `True`, the sigmas and time steps are determined according to a sequence of
`lambda(t)`.
use_flow_sigmas (`bool`, *optional*, defaults to `False`):
Whether to use flow sigmas for step sizes in the noise schedule during the sampling process.
flow_shift (`float`, *optional*, defaults to 1.0):
The shift value for the timestep schedule for flow matching.