optimization for read_func of lcqmc (#553)

* #530 add parameter verification

* skip illegal lines in dataset likes paws-x-zh

Co-authored-by: Zeyu Chen <[email protected]>

Author: King

paddlenlp/datasets/lcqmc.py

@@ -64,9 +64,11 @@ def _read(self, filename):
                 if len(data) == 3:
                     query, title, label = data
                     yield {"query": query, "title": title, "label": label}
-                else:
+                elif len(data) == 2:
                     query, title = data
                     yield {"query": query, "title": title, "label": ''}
+                else:
+                    continue
 
     def get_labels(self):
         """