Update README.md

README.md

@@ -130,12 +130,18 @@ generation_config = dict(
     do_sample=False,
 )
 
+# single-round conversation
 question = "请详细描述图片"
-response, history = model.chat(tokenizer, pixel_values, question, generation_config, history=None)
+response = model.chat(tokenizer, pixel_values, question, generation_config)
+print(question, response)
+
+# multi-round conversation
+question = "请详细描述图片"
+response, history = model.chat(tokenizer, pixel_values, question, generation_config, history=None, return_history=True)
 print(question, response)
 
 question = "请根据图片写一首诗"
-response, history = model.chat(tokenizer, pixel_values, question, generation_config, history=history)
+response, history = model.chat(tokenizer, pixel_values, question, generation_config, history=history, return_history=True)
 print(question, response)
 ```