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Update 15_DDPM.ipynb #21

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3 changes: 2 additions & 1 deletion nbs/15_DDPM.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -262,6 +262,7 @@
"class DDPMCB(TrainCB):\n",
" order = DeviceCB.order+1\n",
" def __init__(self, n_steps, beta_min, beta_max):\n",
" super().__init__()
" self.n_steps,self.βmin,self.βmax = n_steps,beta_min,beta_max\n",
" # variance schedule, linearly increased with timestep\n",
" self.β = torch.linspace(self.βmin, self.βmax, self.n_steps)\n",
Expand Down Expand Up @@ -295,7 +296,7 @@
" ᾱ_t1 = self.ᾱ[t-1] if t > 0 else torch.tensor(1)\n",
" b̄_t = 1 - self.ᾱ[t]\n",
" b̄_t1 = 1 - ᾱ_t1\n",
" noise_pred = learn.model(x_t, t_batch).sample\n",
" noise_pred = model(x_t, t_batch).sample\n",
" x_0_hat = ((x_t - b̄_t.sqrt() * noise_pred)/self.ᾱ[t].sqrt()).clamp(-1,1)\n",
" x0_coeff = ᾱ_t1.sqrt()*(1-self.α[t])/b̄_t\n",
" xt_coeff = self.α[t].sqrt()*b̄_t1/b̄_t\n",
Expand Down