comment update

train.py

@@ -21,6 +21,11 @@
 
 def train(opt):
     """ dataset preparation """
+    if not opt.data_filtering_off:
+        print('Filtering the images containing characters which are not in opt.character')
+        print('Filtering the images whose label is longer than opt.batch_max_length')
+        # see https://github.com/clovaai/deep-text-recognition-benchmark/blob/master/dataset.py#L130
+
     opt.select_data = opt.select_data.split('-')
     opt.batch_ratio = opt.batch_ratio.split('-')
     train_dataset = Batch_Balanced_Dataset(opt)