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arXiv 2402.07876cs.LGcs.AIcs.CL
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利用语言反馈模型的策略改进

Policy Improvement using Language Feedback Models

University of Waterloo(滑铁卢大学);Microsoft Research(微软研究院)

Victor Zhong, Dipendra Misra, Xingdi Yuan, Marc-Alexandre Côté

AI总结:

该研究提出语言反馈模型(LFM),利用大语言模型对视觉轨迹的语言描述反馈识别理想行为,用于指令跟随的模仿学习,在多环境中提升任务完成率,可泛化到新环境,还能提供可解释反馈。

摘要:

我们提出了语言反馈模型(Language Feedback Models,LFMs),用于识别指令跟随模仿学习中的理想行为——即有助于完成指令所指定任务的动作。为训练LFM,我们将视觉轨迹转化为语言描述,再从大语言模型(Large Language Models,LLMs)处获取反馈。首先,通过使用LFM识别待模仿的理想行为,我们在三种不同的语言落地环境(Touchdown、ScienceWorld和ALFWorld)中,任务完成率优于强行为克隆基线。其次,在控制LLM输出token数量的情况下,LFM的表现优于直接用LLM作为专家预测动作的方法。第三,LFM可泛化到未见过的环境,经过一轮适应后,任务完成率提升3.5-12.0%。最后,LFM可被修改为提供人类可解释的反馈且不损失性能,支持人工验证模仿学习所需的理想行为。

英文摘要:

We introduce Language Feedback Models (LFMs) that identify desirable behaviour - actions that help achieve tasks specified in the instruction - for imitation learning in instruction following. To train LFMs, we obtain feedback from Large Language Models (LLMs) on visual trajectories verbalized to language descriptions. First, by using LFMs to identify desirable behaviour to imitate, we improve in task-completion rate over strong behavioural cloning baselines on three distinct language grounding environments (Touchdown, ScienceWorld, and ALFWorld). Second, LFMs outperform using LLMs as experts to directly predict actions, when controlling for the number of LLM output tokens. Third, LFMs generalize to unseen environments, improving task-completion rate by 3.5-12.0% through one round of adaptation. Finally, LFM can be modified to provide human-interpretable feedback without performance loss, allowing human verification of desirable behaviour for imitation learning.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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