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Add set_shift to FlowMatchEulerDiscreteScheduler #10269

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Merged
merged 1 commit into from
Dec 17, 2024
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Add set_shift to FlowMatchEulerDiscreteScheduler #10269

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14 changes: 13 additions & 1 deletion 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 @@ -99,10 +99,19 @@ def __init__(
self._step_index = None
self._begin_index = None

self._shift = shift

self.sigmas = sigmas.to("cpu") # to avoid too much CPU/GPU communication
self.sigma_min = self.sigmas[-1].item()
self.sigma_max = self.sigmas[0].item()

@property
def shift(self):
"""
The value used for shifting.
"""
return self._shift

@property
def step_index(self):
"""
Expand All @@ -128,6 +137,9 @@ def set_begin_index(self, begin_index: int = 0):
"""
self._begin_index = begin_index

def set_shift(self, shift: float):
self._shift = shift

def scale_noise(
self,
sample: torch.FloatTensor,
Expand Down Expand Up @@ -236,7 +248,7 @@ def set_timesteps(
if self.config.use_dynamic_shifting:
sigmas = self.time_shift(mu, 1.0, sigmas)
else:
sigmas = self.config.shift * sigmas / (1 + (self.config.shift - 1) * sigmas)
sigmas = self.shift * sigmas / (1 + (self.shift - 1) * sigmas)

if self.config.shift_terminal:
sigmas = self.stretch_shift_to_terminal(sigmas)
Expand Down
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