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Fix double timestep shifting in FlowMatchEulerDiscreteScheduler.set_timesteps (#13243) #13706

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Fix double timestep shifting in FlowMatchEulerDiscreteScheduler.set_timesteps (#13243) #13706

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8 changes: 6 additions & 2 deletions src/diffusers/schedulers/scheduling_flow_match_euler_discrete.py
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Original file line number Diff line number Diff line change
Expand Up @@ -333,9 +333,13 @@ def set_timesteps(

if sigmas is None:
if timesteps is None:
# Use the raw, pre-shift `[num_train_timesteps, ..., 1]` range here:
# `self.sigma_max`/`self.sigma_min` are recorded *after* the shift transform
# in `__init__`, so feeding them back into the linspace and then re-applying
# the shift below would shift the schedule twice (#13243).
timesteps = np.linspace(
self._sigma_to_t(self.sigma_max),
self._sigma_to_t(self.sigma_min),
self.config.num_train_timesteps,
1,
num_inference_steps,
)
sigmas = timesteps / self.config.num_train_timesteps
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