changed to input ids

ref_seg_ger.py

@@ -232,6 +232,8 @@ class RefSeg(datasets.GeneratorBasedBuilder):
                             input_ids.append(input_id)
                             labels.append('O')
                 elif len(tokenized_input) == 1:
+                    if tokenized_input == '':
+                        continue
                     input_ids.append(tokenized_input[0])
                     if row['tag'] == 'O':
                         labels.append(row['tag'])