增加读latex文章的功能，添加测试样例

predict.py

@@ -86,6 +86,7 @@ def predict(inputs, top_p, temperature, chatbot=[], history=[], system_prompt=''
             chunk = next(stream_response)
             # print(chunk.decode()[6:])
             if is_head_of_the_stream:
+                # 数据流的第一帧不携带content
                 is_head_of_the_stream = False; continue
             
             if chunk: