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Constant and Sigmoid Noise schedulers setup #149

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Constant and Sigmoid Noise schedulers setup #149

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0debb5f
adding sigmoid noise schedule
gabrielfnayres Dec 5, 2024
e634c2e
adding constant noise scheduler
gabrielfnayres Dec 5, 2024
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12 changes: 12 additions & 0 deletions improved_diffusion/gaussian_diffusion.py
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,18 @@ def get_named_beta_schedule(schedule_name, num_diffusion_timesteps):
num_diffusion_timesteps,
lambda t: math.cos((t + 0.008) / 1.008 * math.pi / 2) ** 2,
)
elif schedule_name == "constant":
scale = 1000 / num_diffusion_timesteps
beta_end = scale * 0.02
return beta_end * np.ones(
num_diffusion_timesteps, dtype=np.float64
)
elif schedule_name == "sigmoid":
scale = 1000 / num_diffusion_timesteps
beta_start = scale * 0.0001
beta_end = scale * 0.02
betas = np.linspace(-6, 6, num_diffusion_timesteps)
return (1/(np.exp(betas) + 1)) * (beta_end - beta_start) + beta_start
else:
raise NotImplementedError(f"unknown beta schedule: {schedule_name}")

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