add comments

tasks/knwl_dialo/preprocessing.py

@@ -268,13 +268,12 @@ def get_database(test_datapath, train_datapath, data_type):
             turns = splits[1].split(" [SEP] ")[-3:]
             knowledge = splits[2]
             response = splits[3]
-
             # filtering data samples
             if knowledge == "no_passages_used":
                 # when no knowledge is used
                 continue
             if data_type != "wow_seen" and ("(" in knowledge or ")" in knowledge):
-                # when brackets existing in the knowledge
+                # when bracket exists in the knowledge
                 continue
             if data_type != "wow_seen" and topic not in knowledge:
                 # when topic does not exist in the knowledge