update Benchmark.md

appendix/benchmark.md

@@ -3,7 +3,7 @@
 ## Photo
 
 Note: waifu2x's photo models was trained on [kou's photo collection](http://photosku.com/photo/category/%E6%92%AE%E5%BD%B1%E8%80%85/kou/).
-Note: PSNR in this benchmark uses a MATLAB's rgb2ycbcr compatible function(dynamic range [16 235], not [0, 255]) for converting grayscale image. I think it's not correct PSNR. But many paper used this metric.
+Note: PSNR in this benchmark uses a [MATLAB's rgb2ycbcr](https://jp.mathworks.com/help/images/ref/rgb2ycbcr.html?lang=en) compatible function (dynamic range [16 235], not [0 255]) for converting grayscale image. I think it's not correct PSNR. But many paper used this metric.
 
 command: 
 `th tools/benchmark.lua -dir <dataset_dir> -model1_dir <model_dir> -method scale -filter Catrom -color y -range_bug 1 -tta <0|1> -force_cudnn 1`
@@ -22,7 +22,7 @@ Urban100: https://github.com/jbhuang0604/SelfExSR
 
 ### 2x with TTA - PSNR 
 
-Note: TTA is an ensemble technique that is supported by waifu2x. This method is 8x slower than non TTA method but it improves PSNR (~+0.1 on photo, ~+0.4 on art).
+Note: TTA is an ensemble technique that is supported by waifu2x. TTA method is 8x slower than non TTA method but it improves PSNR (~+0.1 on photo, ~+0.4 on art).
 
 | Dataset/Model | Bicubic       | vgg\_7/photo  | upconv\_7/photo  | upconv\_7l/photo | 
 |---------------|---------------|---------------|------------------|------------------|