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Update pipeline_ddpm.py #1

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8 changes: 7 additions & 1 deletion src/diffusers/pipelines/ddpm/pipeline_ddpm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -109,12 +109,18 @@ def __call__(
# set step values
self.scheduler.set_timesteps(num_inference_steps)

# check if the scheduler accepts generator
accepts_generator = "generator" in set(inspect.signature(self.scheduler.step).parameters.keys())

for t in self.progress_bar(self.scheduler.timesteps):
# 1. predict noise model_output
model_output = self.unet(image, t).sample

# 2. compute previous image: x_t -> x_t-1
image = self.scheduler.step(model_output, t, image, generator=generator).prev_sample
if accepts_generator:
image = self.scheduler.step(model_output, t, image, generator=generator).prev_sample
else:
image = self.scheduler.step(model_output, t, image, ).prev_sample

image = (image / 2 + 0.5).clamp(0, 1)
image = image.cpu().permute(0, 2, 3, 1).numpy()
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