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- +![](assets/2023-10-06-18-59-33.png) ## 确定超参数的值 @@ -35,49 +32,57 @@ one_minus_alphas_bar_sqrt = torch.sqrt(1 - alphas_prod) # 计算1 - alphas_prod ``` -**betas = torch.linspace(-6,6,num_steps)**: -\[ +**betas = torch.linspace(-6,6,num_steps)**: + +$$ \text{betas}_i = -6 + \frac{(6 - (-6)) \times (i - 1)}{\text{num\_steps} - 1}, \quad i = 1, 2, \ldots, \text{num\_steps} -\] +$$ **betas = torch.sigmoid(betas)*(0.5e-2 - 1e-5)+1e-5**: -\[ + +$$ \text{betas}_i' = \frac{1}{1 + e^{-\text{betas}_i}} \times (0.5 \times 10^{-2} - 10^{-5}) + 10^{-5} -\] +$$ **alphas = 1-betas**: -\[ + +$$ \text{alphas}_i = 1 - \text{betas}_i' -\] +$$ **alphas_prod = torch.cumprod(alphas,0)**: -\[ + +$$ \text{alphas\_prod}_i = \prod_{j=1}^{i} \text{alphas}_j -\] +$$ **alphas_prod_p = torch.cat([torch.tensor([1]).float(),alphas_prod[:-1]],0)**: -\[ + +$$ \text{alphas\_prod\_p}_i = \begin{cases} 1, & \text{if } i = 1 \\ \text{alphas\_prod}_{i-1}, & \text{otherwise} \end{cases} -\] +$$ **alphas_bar_sqrt = torch.sqrt(alphas_prod)**: -\[ + +$$ \text{alphas\_bar\_sqrt}_i = \sqrt{\text{alphas\_prod}_i} -\] +$$ **one_minus_alphas_bar_log = torch.log(1 - alphas_prod)**: -\[ + +$$ \text{one\_minus\_alphas\_bar\_log}_i = \ln(1 - \text{alphas\_prod}_i) -\] +$$ **one_minus_alphas_bar_sqrt = torch.sqrt(1 - alphas_prod)**: -\[ + +$$ \text{one\_minus\_alphas\_bar\_sqrt}_i = \sqrt{1 - \text{alphas\_prod}_i} -\] +$$