[schedulers] create self.sigmas
during __init__
#6006
Merged
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fix this #5981
we refactored
add_noise
method to calculate based on sigmas in #5158, butself.sigmas
is only created when you runset_timesteps()
this will cause error when the
add_noise
method is used withoutset_timesteps()
, i.e. typical when used in training. In this PR we will createself.sigmas
during__init__
.