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schedulers/dpmsolver_multistep: add missing sde-dpmsolver branch in third-order update #13778

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schedulers/dpmsolver_multistep: add missing sde-dpmsolver branch in third-order update #13778

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9 changes: 9 additions & 0 deletions src/diffusers/schedulers/scheduling_dpmsolver_multistep.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1133,6 +1133,15 @@ def multistep_dpm_solver_third_order_update(
+ (alpha_t * ((1.0 - torch.exp(-2.0 * h) - 2.0 * h) / (2.0 * h) ** 2 - 0.5)) * D2
+ sigma_t * torch.sqrt(1.0 - torch.exp(-2 * h)) * noise
)
elif self.config.algorithm_type == "sde-dpmsolver":
assert noise is not None
x_t = (
(alpha_t / alpha_s0) * sample
- 2.0 * (sigma_t * (torch.exp(h) - 1.0)) * D0
- 2.0 * (sigma_t * ((torch.exp(h) - 1.0) / h - 1.0)) * D1
- 2.0 * (sigma_t * ((torch.exp(h) - 1.0 - h) / h**2 - 0.5)) * D2
+ sigma_t * torch.sqrt(torch.exp(2 * h) - 1.0) * noise
)
return x_t

def index_for_timestep(
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