Add benchmark results

appendix/vgg_7_vs_upconv_7_art.md

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+# models/vgg_7/art vs models/upconv_7/art
+
+## dataset
+
+noise free 84 anime style arts. PNG format only.
+
+## 2x
+
+### filter=Sinc
+
+| model         |  PSNR      | time   |
+|---------------|------------|--------|
+| vgg\_7/art    | 36.471     | 22.21  |
+| upconv\_7/art | 37.087     |  9.44  |
+
+### filter=Box
+| model         |  PSNR      | time   |
+|---------------|------------|--------|
+| vgg\_7/art    | 36.456     | 22.05  |
+| upconv\_7/art | 36.952     |  9.27  |
+
+## 2x + noise reduction level 1, jpeg quality=80
+
+### filter=Sinc
+| model         |  PSNR      | time   |
+|---------------|------------|--------|
+| vgg\_7/art    | 32.989     | 27.79  |
+| upconv\_7/art | 33.211     |  9.41  |
+
+### filter=Box
+
+| model         |  PSNR      | time   |
+|---------------|------------|--------|
+| vgg\_7/art    | 33.200     | 27.07  |
+| upconv\_7/art | 33.322     |  9.33  |
+
+### 2x + noise reduction level 2, jpeg quality=50,45
+
+### filter=Sinc
+
+| model         |  PSNR      | time   |
+|---------------|------------|--------|
+| vgg\_7/art    | 30.446     | 27.62  |
+| upconv\_7/art | 30.658     |  9.45  |
+
+### filter=Box
+
+| model         |  PSNR      | time   |
+|---------------|------------|--------|
+| vgg\_7/art    | 30.513     | 27.37  |
+| upconv\_7/art | 30.699     |  9.43  |