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深度强化学习的 18 个关键问题 | PaperDaily #30

發布時間：2024/10/8 编程问答 30 豆豆

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在碎片化閱讀充斥眼球的時代，越來越少的人會去關注每篇論文背后的探索和思考。

在這個欄目里，你會快速 get 每篇精選論文的亮點和痛點，時刻緊跟 AI 前沿成果。

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這是 PaperDaily 的第?30?篇文章

關于作者：王凌霄（社區ID @Nevertiree），中國科學院自動化研究所實習生，研究方向為強化學習和多智能體。

這兩天我閱讀了兩篇篇猛文 A Brief Survey of Deep Reinforcement Learning 和 Deep Reinforcement Learning: An Overview，作者排山倒海的引用了 200 多篇文獻，闡述強化學習未來的方向。

■?論文 | A Brief Survey of Deep Reinforcement Learning

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

■ 作者 | Nevertiree

■?論文 | Deep Reinforcement Learning: An Overview

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

■ 作者 | Nevertiree

原文歸納出深度強化學習中的常見科學問題，并列出了目前解法與相關綜述，我在這里做出整理，抽取了相關的論文。 這里精選 18 個關鍵問題，涵蓋空間搜索、探索利用、策略評估、內存使用、網絡設計、反饋激勵等等話題。

本文精選了 73 篇論文（其中 2017 年的論文有 27 篇，2016 年的論文有 21 篇），為了方便閱讀，原標題放在文章最后，可以根據索引找到。

問題一：預測與策略評估

prediction, policy evaluation?

萬變不離其宗，Temporal Difference 方法仍然是策略評估的核心哲學【Sutton 1988】。TD的拓展版本和她本身一樣鼎鼎大名—1992 年的 Q-learning 與 2015 年的 DQN。?

美中不足，TD Learning 中很容易出現 Over-Estimate（高估）問題，具體原因如下：?

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

曠世猛將 van Hasselt 先生很喜歡處理 Over-Estimate 問題，他先搞出一個 Double Q-learning【van Hasselt 2010】大鬧 NIPS，六年后搞出深度學習版本的 Double DQN【van Hasselt 2016a】。

問題二：控制與最佳策略選擇

control, finding optimal policy?

目前解法有三個流派，一圖勝千言：

△?圖1：臺大李宏毅教授的 Slide

1. 最傳統的方法是 Value-Based，就是選擇有最優 Value 的 Action。最經典方法有：Q-learning 【Watkins and Dayan 1992】、SARSA 【Sutton and Barto 2017】 。

2. 后來 Policy-Based 方法引起注意，最開始是 REINFORCE 算法【Williams 1992】，后來策略梯度 Policy Gradient【Sutton 2000】出現。

3. 最時行的 Actor-Critic 【Barto et al 1983】把兩者做了結合。樓上 Sutton 老爺子的好學生、AlphaGo 的總設計師 David Silver 同志提出了 Deterministic Policy Gradient，表面上是 PG，實際講了一堆 AC，這個改進史稱 DPG【Silver 2014】。

△?圖2：Actor-Critic 的循環促進過程

問題三：不穩定與不收斂問題

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

早在 1997 年 Tsitsiklis 就證明了如果 Function Approximator 采用了神經網絡這種非線性的黑箱，那么其收斂性和穩定性是無法保證的。?

分水嶺論文 Deep Q-learning Network【Mnih et al 2013】中提到：雖然我們的結果看上去很好，但是沒有任何理論依據（原文很狡猾的反過來說一遍）。?

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.

△?圖3：征服 Atari 游戲的 DQN

DQN 的改良主要依靠兩個 Trick：?

1. 經驗回放【Lin 1993】

雖然做不到完美的獨立同分布，但還是要盡力減少數據之間的關聯性。

2. Target Network【Mnih 2015】

Estimated Network 和 Target Network 不能同時更新參數，應該另設 Target Network 以保證穩定性。

Since the network Q being updated is also used in calculating the target value, the Q update is prone to divergence.（為什么我們要用 Target Network）?

下面幾篇論文都是 DQN 相關話題的：?

1. 經驗回放升級版：Prioritized Experience Replay 【Schaul 2016】?

2. 更好探索策略【Osband 2016】?

3. DQN 加速【He 2017a】?

4. 通過平均減少方差與不穩定性 Averaged-DQN 【Anschel 2017】?

下面跳出 DQN 的范疇：

Duel DQN【Wang 2016c】（ICML 2016 最佳論文）?

Tips：閱讀此文請掌握 DQN、Double DQN、Prioritized Experience Replay 這三個背景。?

異步算法 A3C 【Mnih 2016】
TRPO (Trust Region Policy Optimization)【Schulman 2015】
Distributed Proximal Policy Optimization 【Heess 2017】?

Policy gradient 與 Q-learning 的結合【O'Donoghue 2017、Nachum 2017、 Gu 2017、Schulman 2017】?
GTD 【Sutton 2009a、Sutton 2009b、Mahmood 2014】?
Emphatic-TD 【Sutton 2016】

問題四：End-to-End 下的訓練感知與控制

train perception and control jointly end-to-end?

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

問題五：數據利用效率

data/sample efficiency?

現有解法有：?

Q-learning 與 Actor-Critic?
經驗回放下的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】

問題六：無法取得激勵

reward function not available?

現有解法基本上圍繞模仿學習：

吳恩達的逆強化學習【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 實現 [1]）?
train dialogue policy jointly with reward model 【Su et al 2016b】

問題七：探索-利用問題

exploration-exploitation tradeoff?

現有解法有：?

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】

問題八：基于模型的學習

model-based learning?

現有解法：?

Sutton 老爺子教科書里的經典安利：Dyna-Q 【Sutton 1990】?
model-free 與 model-based 的結合使用【Chebotar et al 2017】

問題九：無模型規劃

model-free planning?

比較新的解法有兩個：?

1. Value Iteration Networks【Tamar et al 2016】是勇奪 NIPS2016 最佳論文頭銜的猛文。

知乎上有專門的文章解說：Value iteration Network [2]，還有作者的采訪：NIPS 2016 最佳論文作者：如何打造新型強化學習觀?[3]。VIN 的 TensorFlow 實現 [4]。

△?圖4：Value Iteration Network 的框架

2.?DeepMind 的 Silver 大神發表的 Predictron 方法【Silver et al 2016b】，附 TensorFlow 實現 [5]。

問題十：它山之石可以攻玉

focus on salient parts?

@賈揚清大神曾經說過：?

伯克利人工智能方向的博士生，入學一年以后資格考試要考這幾個內容：強化學習和 Robotics、統計和概率圖模型、計算機視覺和圖像處理、語音和自然語言處理、核方法及其理論、搜索，CSP，邏輯，Planning 等。

如果真的想做人工智能，建議都了解一下，不是說都要搞懂搞透，但是至少要達到開會的時候和人在 poster 前面談笑風生不出錯的程度吧。?

因此，一個很好的思路是從計算機視覺與自然語言處理領域汲取靈感，例如下文中將會提到的 unsupervised auxiliary learning 方法借鑒了 RNN+LSTM 中的大量操作。?

下面是 CV 和 NLP 方面的幾個簡介：物體檢測【Mnih 2014】、機器翻譯【Bahdanau 2015】、圖像標注【Xu 2015】、用 Attention 代替 CNN 和 RNN【Vaswani 2017】等等。

問題十一：長時間數據儲存

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】。

問題十二：無回報訓練

benefit from non-reward training signals in environments?

現有解法圍繞著無監督學習開展：

Horde 【Sutton et al 2011】?

極其優秀的工作：

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】

問題十三：跨領域學習

learn knowledge from different domains?

現有解法全部圍繞遷移學習走：【Taylor and Stone, 2009、Pan and Yang 2010、Weiss et al 2016】，learn invariant features to transfer skills 【Gupta et al 2017】。

問題十四：有標簽數據與無標簽數據混合學習

benefit from both labelled and unlabelled data?

現有解法全部圍繞半監督學習：

【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】

問題十五：多層抽象差分空間的表示與推斷

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

現有解法：

多層強化學習【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】

問題十六：不同任務環境快速適應

adapt rapidly to new tasks?

現有解法基本上是 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】

問題十七：巨型搜索空間

gigantic search space?

現有解法依然是蒙特卡洛搜索，詳情可以參考初代 AlphaGo 的實現【Silver et al 2016a】。

問題十八：神經網絡架構設計

neural networks architecture design

現有的網絡架構搜索方法【Baker et al 2017、Zoph and Le 2017】，其中 Zoph 的工作分量非常重。?

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

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