comment update

dataset.py

@@ -124,10 +124,13 @@ def __init__(self, root, opt):
             self.nSamples = nSamples
 
             if self.opt.data_filtering_off:
-                # for fast check with no filtering
+                # for fast check or benchmark evaluation with no filtering
                 self.filtered_index_list = [index + 1 for index in range(self.nSamples)]
             else:
-                # Filtering
+                """ Filtering part
+                If you want to evaluate IC152077 & CUTE80 datasets which have special character labels, use --data_filtering_off and evaluation with this snippet (only evaluate on alphabets and digits).
+                https://github.com/clovaai/deep-text-recognition-benchmark/blob/master/dataset.py#L186-L188
+                """
                 self.filtered_index_list = []
                 for index in range(self.nSamples):
                     index += 1  # lmdb starts with 1
@@ -276,7 +279,7 @@ def __call__(self, batch):
             resized_max_w = self.imgW
             input_channel = 3 if images[0].mode == 'RGB' else 1
             transform = NormalizePAD((input_channel, self.imgH, resized_max_w))
-           
+
             resized_images = []
             for image in images:
                 w, h = image.size