论文标题

探索以一定的观察来探索最佳控制

Exploring Optimal Control With Observations at a Cost

论文作者

Aguiar, Rui, Mofid, Nikka, Nam, Hyunji Alex

论文摘要

当前的医疗保健文献增强学习趋势是为了准备临床数据集,研究人员将在未经管理的测试中取得最后的结果,即被称为最后一个观察到的(LOCF)值(LOCF)值以填补空白,假设它仍然是患者当前状态的准确指标。这些值是在不保留有关这些值的准确信息的情况下进行的,从而导致了歧义。我们的方法使用Openai Gym的Mountain Car模拟了这个问题,旨在解决何时观察患者的生理状态并部分干预,因为我们认为我们只能在观察后才采取行动。 So far, we have found that for a last-observation-carried-forward implementation of the state space, augmenting the state with counters for each state variable tracking the time since last observation was made, improves the predictive performance of an agent, supporting the notion of "informative missingness", and using a neural network based Dynamics Model to predict the most probable next state value of non-observed state variables instead of carrying forward the last observed value through LOCF further改善了代理的性能,从而导致更快的收敛性和差异降低。

There has been a current trend in reinforcement learning for healthcare literature, where in order to prepare clinical datasets, researchers will carry forward the last results of the non-administered test known as the last-observation-carried-forward (LOCF) value to fill in gaps, assuming that it is still an accurate indicator of the patient's current state. These values are carried forward without maintaining information about exactly how these values were imputed, leading to ambiguity. Our approach models this problem using OpenAI Gym's Mountain Car and aims to address when to observe the patient's physiological state and partly how to intervene, as we have assumed we can only act after following an observation. So far, we have found that for a last-observation-carried-forward implementation of the state space, augmenting the state with counters for each state variable tracking the time since last observation was made, improves the predictive performance of an agent, supporting the notion of "informative missingness", and using a neural network based Dynamics Model to predict the most probable next state value of non-observed state variables instead of carrying forward the last observed value through LOCF further improves the agent's performance, leading to faster convergence and reduced variance.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源