深度强化学习的 18 个关键问题 | PaperDaily #30

2017 年 12 月 22 日 PaperWeekly 王凌霄




在碎片化阅读充斥眼球的时代,越来越少的人会去关注每篇论文背后的探索和思考。


在这个栏目里,你会快速 get 每篇精选论文的亮点和痛点,时刻紧跟 AI 前沿成果。


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这是 PaperDaily 的第 30 篇文章


关于作者:王凌霄(社区ID @Nevertiree),中国科学院自动化研究所实习生,研究方向为强化学习和多智能体。


这两天我阅读了两篇篇猛文 A Brief Survey of Deep Reinforcement LearningDeep Reinforcement Learning: An Overview,作者排山倒海的引用了 200 多篇文献,阐述强化学习未来的方向。


■ 论文 | A Brief Survey of Deep Reinforcement Learning

■ 链接 | http://www.paperweekly.site/papers/922

■ 作者 | Nevertiree


■ 论文 | Deep Reinforcement Learning: An Overview

■ 链接 | http://www.paperweekly.site/papers/1372

■ 作者 | Nevertiree


原文归纳出深度强化学习中的常见科学问题,并列出了目前解法与相关综述,我在这里做出整理,抽取了相关的论文。 这里精选 18 个关键问题,涵盖空间搜索、探索利用、策略评估、内存使用、网络设计、反馈激励等等话题


本文精选了 73 篇论文(其中 2017 年的论文有 27 篇,2016 年的论文有 21 篇),为了方便阅读,原标题放在文章最后,可以根据索引找到。


问题一:预测与策略评估


prediction, policy evaluation 


万变不离其宗,Temporal Difference 方法仍然是策略评估的核心哲学【Sutton 1988】。TD的拓展版本和她本身一样鼎鼎大名—1992 年的 Q-learning 与 2015 年的 DQN。 


美中不足,TD Learning 中很容易出现 Over-Estimate(高估)问题,具体原因如下: 


The max operator in standard Q-learning and DQN use the same values both to select and to evaluate an action. — van Hasselt 


旷世猛将 van Hasselt 先生很喜欢处理 Over-Estimate 问题,他先搞出一个 Double Q-learning【van Hasselt 2010】大闹 NIPS,六年后搞出深度学习版本的 Double DQN【van Hasselt 2016a】


问题二:控制与最佳策略选择


control, finding optimal policy 


目前解法有三个流派,一图胜千言:


△ 图1:台大李宏毅教授的 Slide


1. 最传统的方法是 Value-Based,就是选择有最优 Value 的 Action。最经典方法有:Q-learning 【Watkins and Dayan 1992】、SARSA 【Sutton and Barto 2017】


2. 后来 Policy-Based 方法引起注意,最开始是 REINFORCE 算法【Williams 1992】,后来策略梯度 Policy Gradient【Sutton 2000】出现。


3. 最时行的 Actor-Critic 【Barto et al 1983】把两者做了结合。楼上 Sutton 老爷子的好学生、AlphaGo 的总设计师 David Silver 同志提出了 Deterministic Policy Gradient,表面上是 PG,实际讲了一堆 AC,这个改进史称 DPG【Silver 2014】。


△ 图2:Actor-Critic 的循环促进过程


问题三:不稳定与不收敛问题


Instability and Divergence when combining off-policy,function approximation,bootstrapping 


早在 1997 年 Tsitsiklis 就证明了如果 Function Approximator 采用了神经网络这种非线性的黑箱,那么其收敛性和稳定性是无法保证的。 


分水岭论文 Deep Q-learning Network【Mnih et al 2013】中提到:虽然我们的结果看上去很好,但是没有任何理论依据(原文很狡猾的反过来说一遍)。 


This suggests that, despite lacking any theoretical convergence guarantees, our method is able to train large neural networks using a reinforcement learning signal and stochastic gradient descent in stable manner.


△ 图3:征服 Atari 游戏的 DQN


DQN 的改良主要依靠两个 Trick: 


1. 经验回放【Lin 1993】


虽然做不到完美的独立同分布,但还是要尽力减少数据之间的关联性 。


2. Target Network【Mnih 2015】


Estimated Network 和 Target Network 不能同时更新参数,应该另设 Target Network 以保证稳定性。


Since the network Q being updated is also used in calculating the target value, the Q update is prone to divergence.(为什么我们要用 Target Network) 


下面几篇论文都是 DQN 相关话题的: 


1. 经验回放升级版:Prioritized Experience Replay 【Schaul 2016】 


2. 更好探索策略 【Osband 2016】 


3. DQN 加速 【He 2017a】 


4. 通过平均减少方差与不稳定性 Averaged-DQN 【Anschel 2017】 


下面跳出 DQN 的范畴:


Duel DQN【Wang 2016c】(ICML 2016 最佳论文) 


Tips:阅读此文请掌握 DQN、Double DQN、Prioritized Experience Replay 这三个背景。 


  • 异步算法 A3C 【Mnih 2016】


  • TRPO (Trust Region Policy Optimization)【Schulman 2015】


  • Distributed Proximal Policy Optimization 【Heess 2017】 


  • Policy gradient 与 Q-learning 的结合【O'Donoghue 2017、Nachum 2017、 Gu 2017、Schulman 2017】 


  • GTD 【Sutton 2009a、Sutton 2009b、Mahmood 2014】 


  • Emphatic-TD 【Sutton 2016】


问题四:End-to-End 下的训练感知与控制


train perception and control jointly end-to-end 


现有解法是 Guided Policy Search 【Levine et al 2016a】。


问题五:数据利用效率


data/sample efficiency 


现有解法有: 


  • Q-learning 与 Actor-Critic 


  • 经验回放下的actor-critic 【Wang et al 2017b】 


  • PGQ,policy gradient and Q-learning 【O'Donoghue et al 2017】 


  • Q-Prop, policy gradient with off-policy critic 【Gu et al 2017】 


  • return-based off-policy control, Retrace 【Munos et al 2016】, Reactor 【Gruslyset al 2017】 


  • learning to learn, 【Duan et al 2017、Wang et al 2016a、Lake et al 2015】


问题六:无法取得激励


reward function not available 


现有解法基本上围绕模仿学习:


  • 吴恩达的逆强化学习【Ng and Russell 2000】 


  • learn from demonstration 【Hester et al 2017】 


  • imitation learning with GANs 【Ho and Ermon 2016、Stadie et al 2017】 (附TensorFlow 实现 [1]) 


  • train dialogue policy jointly with reward model 【Su et al 2016b】


问题七:探索-利用问题


exploration-exploitation tradeoff 


现有解法有: 


  • unify count-based exploration and intrinsic motivation 【Bellemare et al 2017】 


  • under-appreciated reward exploration 【Nachum et al 2017】 


  • deep exploration via bootstrapped DQN 【Osband et al 2016)】 


  • variational information maximizing exploration 【Houthooft et al 2016】


问题八:基于模型的学习


model-based learning 


现有解法: 


  • Sutton 老爷子教科书里的经典安利:Dyna-Q 【Sutton 1990】 


  • model-free 与 model-based 的结合使用【Chebotar et al 2017】


问题九:无模型规划


model-free planning 


比较新的解法有两个: 


1. Value Iteration Networks【Tamar et al 2016】是勇夺 NIPS2016 最佳论文头衔的猛文。


知乎上有专门的文章解说:Value iteration Network [2]还有作者的采访:NIPS 2016 最佳论文作者:如何打造新型强化学习观 [3]VIN 的 TensorFlow 实现 [4]


△ 图4:Value Iteration Network 的框架


2. DeepMind 的 Silver 大神发表的 Predictron 方法 【Silver et al 2016b】,附 TensorFlow 实现 [5]


问题十:它山之石可以攻玉


focus on salient parts 


@贾扬清 大神曾经说过: 


伯克利人工智能方向的博士生,入学一年以后资格考试要考这几个内容:强化学习和 Robotics、 统计和概率图模型、 计算机视觉和图像处理、 语音和自然语言处理、 核方法及其理论、 搜索,CSP,逻辑,Planning 等。


如果真的想做人工智能,建议都了解一下,不是说都要搞懂搞透,但是至少要达到开会的时候和人在 poster 前面谈笑风生不出错的程度吧。 


因此,一个很好的思路是从计算机视觉与自然语言处理领域汲取灵感,例如下文中将会提到的 unsupervised auxiliary learning 方法借鉴了 RNN+LSTM 中的大量操作。 


下面是 CV 和 NLP 方面的几个简介:物体检测 【Mnih 2014】、机器翻译 【Bahdanau 2015】、图像标注【Xu 2015】、用 Attention 代替 CNN 和 RNN【Vaswani 2017】等等。


问题十一:长时间数据储存


data storage over long time, separating from computation 


最出名的解法是在 Nature 上大秀一把的 Differentiable Neural Computer【Graves et al 2016】。


问题十二:无回报训练


benefit from non-reward training signals in environments 


现有解法围绕着无监督学习开展:


Horde 【Sutton et al 2011】 


极其优秀的工作:


unsupervised reinforcement and auxiliary learning 【Jaderberg et al 2017】 


learn to navigate with unsupervised auxiliary learning 【Mirowski et al 2017】 


大名鼎鼎的 GANs 【Goodfellow et al 2014】


问题十三:跨领域学习


learn knowledge from different domains 


现有解法全部围绕迁移学习走:【Taylor and Stone, 2009、Pan and Yang 2010、Weiss et al 2016】,learn invariant features to transfer skills 【Gupta et al 2017】。


问题十四:有标签数据与无标签数据混合学习


benefit from both labelled and unlabelled data 


现有解法全部围绕半监督学习:


  • 【Zhu and Goldberg 2009】 


  • learn with MDPs both with and without reward functions 【Finn et al 2017)】 


  • learn with expert's trajectories and those may not from experts 【Audiffren et al 2015】


问题十五:多层抽象差分空间的表示与推断


learn, plan, and represent knowledge with spatio-temporal abstraction at multiple levels 


现有解法:


  • 多层强化学习 【Barto and Mahadevan 2003】 


  • strategic attentive writer to learn macro-actions 【Vezhnevets et al 2016】 


  • integrate temporal abstraction with intrinsic motivation 【Kulkarni et al 2016】 


  • stochastic neural networks for hierarchical RL 【Florensa et al 2017】 


  • lifelong learning with hierarchical RL 【Tessler et al 2017】

问题十六:不同任务环境快速适应


adapt rapidly to new tasks 


现有解法基本上是 learn to learn learn:


  • a flexible RNN model to handle a family of RL tasks 【Duan et al 2017、Wang et al 2016a】 


  • one/few/zero-shot learning 【Duan et al 2017、Johnson et al 2016、 Kaiser et al 2017b、Koch et al 2015、Lake et al 2015、Li and Malik 2017、Ravi and Larochelle, 2017、Vinyals et al 2016


问题十七:巨型搜索空间


gigantic search space 


现有解法依然是蒙特卡洛搜索,详情可以参考初代 AlphaGo 的实现【Silver et al 2016a】。


问题十八:神经网络架构设计


neural networks architecture design


现有的网络架构搜索方法【Baker et al 2017、Zoph and Le 2017】,其中 Zoph 的工作分量非常重。 


新的架构有【Kaiser et al 2017a、Silver et al 2016b、Tamar et al 2016、Vaswani et al 2017、Wang et al 2016c】。


相关链接


[1] imitation learning with GANs 实现

https://github.com/openai/imitation

[2] Value iteration Network  

https://zhuanlan.zhihu.com/p/24478944

[3] 如何打造新型强化学习观

http://www.sohu.com/a/121100017_465975

[4] Value Iteration Networks 实现

https://github.com/TheAbhiKumar/tensorflow-value-iteration-networks

[5] Predictron 实现

https://github.com/zhongwen/predictron


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