Representing results of Agent best practice with Qwen2-7b-instruct outputs unexpected <|endoftext|> and <|im_start|>

[edgeinfinity-wzt]

Describe the bug
What the bug is, and how to reproduce, better with screenshots(描述bug以及复现过程，最好有截图)

使用agent最佳实践提供的脚本, 训练测试后, response中出现额外的<|endoftext|>和Human. 如果继续循环, 会破坏模型的应答模式.

Your hardware and system info
Write your system info like CUDA version/system/GPU/torch version here(在这里给出硬件信息和系统信息，如CUDA版本，系统，GPU型号和torch版本等)
此问题应该与硬件和系统无关.

Additional context
Add any other context about the problem here(在这里补充其他信息)