Fixed the bug that caused the training to stop directly when the training data was not alternating between user and assistant. (#221)

* fix bug

* Update parse.py

Author: jiapingW

specforge/data/parse.py

@@ -68,7 +68,11 @@ def parse(
             convroles = ["user", "assistant"]
             for j, sentence in enumerate(conversation):
                 role = sentence["role"]
-                assert role == convroles[j % 2], f"unexpected role {role}"
+                if role != convroles[j % 2]:
+                    warnings.warn(
+                        f"Conversation truncated due to unexpected role '{role}'. Expected '{convroles[j % 2]}'."
+                    )
+                    break
                 messages.append({"role": role, "content": sentence["content"]})
 
             conversation = self.tokenizer.apply_chat_template(