This work was supported in part by National Natural Science Foundation of China (Grant Nos. 61876171, 61976203) and Fundamental Research Funds for the Central Universities.
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Figure 1
(Color online) Architecture of the proposed ICSD-GAN model. The whole network contains three stages (i.e., ${\rm~Stage}^0$, ${\rm~Stage}^1$ and ${\rm~Stage}^2$) and generates images with $64\times~64$, $128\times~128$, and $256\times~256$ resolutions. $G_i$ and $D_i$ are the generator and discriminator for ${\rm~Stage}^i$, respectively. We conduct interstage knowledge distillation between ${\rm~Stage}^2$ and ${\rm~Stage}^0$/${\rm~Stage}^1$ via the CSD block. On the red line, “T" means the teacher branch, and “S" means the student branch.
Figure 2
(Color online) Detailed structure of CSD block. This block takes student feature $F_{\rm~S}$ and teacher feature $F_{\rm~T}$ as input, and outputs the CSD loss. In this figure, the black solid line denotes forward-propagation and the blue dotted line denotes backpropagation. We optimize the output loss without backpropagation to the teacher branch.
Figure 3
(Color online) Visualization results of $256\times~256$ images generated by StackGAN, HDGAN, MS-GAN and our ICSD-GAN model on CUB and Oxford-102 dataset.
Figure 4
(Color online) Visualization of text modification to evaluate the generation ability of our ICSD-GAN on CUB dataset.
Figure 5
(Color online) Visualization of text modification to evaluate the generation ability of our ICSD-GAN on Oxford-102 dataset.
Initialize discriminator parameters $\theta_d~=~[\theta_{d_0},~\theta_{d_1},~\theta_{d_2}]$ and generator parameters $\theta_g~=~[\theta_{g_0},~\theta_{g_1},~\theta_{g_2}]$; |
Sample $x$, text $t$, mis-matching images $x_w$ and random noise $z$; |
$\hat{x}~=~G(z,~t)$ $(\hat{x}~=~[\hat{x}_0\in\mathbb{R}^{N\times3\times64\times~64},~\hat{x}_1\in\mathbb{R}^{N\times3\times128\times128},~\hat{x}_2\in\mathbb{R}^{N\times3\times256\times~256}])$; |
|
$L_{D_i}~\leftarrow~L_{D_i}^{\rm~TF}~+\lambda~L_{D_i}^{\rm~ASL}$; |
$\theta_{d_i}~\leftarrow~\mathrm{Adam}(L_{D_i},~\theta_{d_i},~\alpha_d,~\beta_1,~\beta_2)$; |
|
$L_{G}~\leftarrow~\sum_{i=0}^{2}~L_{G_i}~+~\lambda_1~L_{\rm~DAMSM}~+~L_{\rm~CA}~+~L_{\rm~CSD}(\hat{x}_0,~~\hat{x}_2)~+~L_{\rm~CSD}(\hat{x}_1,~\hat{x}_2)$; |
$\theta_{g}~\leftarrow~\mathrm{Adam}(L_{G},~\theta_{g},~\alpha_g,~\beta_1,~\beta_2)$; |
| $G_0$ | $G_1$/$G_2$ |
| Concat, FC, BN, GLU, Reshape | Attn, Concat |
| UpSample($2$), Conv($3\times3/1$), BN, GLU$\times4$ | AM block $\}\times~N_{\rm~AM}$ |
| Conv($3\times3/1$), Tanh | UpSample($2$), Conv($3\times3/1$), BN, GLU |
| Conv($3\times3/1$), Tanh |
a) AM block denotes the attention-modulation block
| Downsample block in $D_0$ | Downsample block in $D_1$ | Downsample block in $D_2$ |
| Conv($4\times4/2$), LeakyReLU | Conv($4\times4/2$), LeakyReLU | Conv($4\times4/2$), LeakyReLU |
| Conv($4\times4/2$), BN, LeakyReLU $\times~3$ | Conv($4\times4/2$), BN, LeakyReLU $\times~4$ | Conv($4\times4/2$), BN, LeakyReLU $\times~5$ |
| Conv($3\times3/1$), BN, LeakyReLU | Conv($3\times3/1$), BN, LeakyReLU $\times~2$ |
a) Conv($4\times4~/~2$) means that kernel size is 3 and stride is 1 for the convolutional layer.
| Dataset | #images | Captions per image | #categories | #train categories | #test categories |
| CUB | 11788 | 10 | 200 | 150 | 50 |
| Oxford-102 | 8189 | 10 | 102 | 82 | 20 |
| Method | CUB | Oxford-102 | ||
| Inception score ($\uparrow$) | FID ($\downarrow$) | Inception score ($\uparrow$) | FID ($\downarrow$) | |
| GAN_CLS_INT | 2.88 $\pm$ 0.04 | 68.79 | 2.66 $\pm$ 0.03 | 79.55 |
| GANWN | 3.62 $\pm$ 0.07 | 67.22 | – | – |
| StackGAN | 3.70 $\pm$ 0.04 | 51.89 | 3.20 $\pm$ 0.01 | 55.28 |
| StackGAN-v2 | 4.04 $\pm$ 0.05 | 15.30 | 3.26 $\pm$ 0.01 | 48.68 |
| HDGAN | 4.15 $\pm$ 0.05 | 18.23 | 3.45 $\pm$ 0.07 | – |
| AttnGAN | 4.36 $\pm$ 0.03 | 10.65 | 3.75 $\pm$ 0.02 | – |
| MirrorGAN | 4.56 $\pm$ 0.05 | – | – | – |
| LeicaGAN | 4.62 $\pm$ 0.06 | – | 3.92 $\pm$ 0.02 | – |
| MS-GAN | 4.56 $\pm$ 0.02 | 10.41 | 36.24 | |
| ICSD-GAN | 3.87 $\pm$ 0.05 | |||
| Method | Inception score ($\uparrow$) | FID ($\downarrow$) |
| Baseline | 4.56 $\pm$ 0.02 | 10.41 |
| With $L_{\rm~CSD}(I_0,~I_2)$ | 10.97 | |
| With $L_{\rm~CSD}(I_1,~I_2)$ | 4.58 $\pm$ 0.04 | 9.58 |
| ICSD-GAN | 4.66 $\pm$ 0.04 |
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