# Reinforcement Learning

## Introduction

1. [Reinforcement Learning: An Introduction second edition WIP](https://web.stanford.edu/class/psych209/Readings/SuttonBartoIPRLBook2ndEd.pdf) & completed [book](http://incompleteideas.net/book/RLbook2020.pdf)
2. Vidhya on [Getting ready for AI based gaming agents – Overview of Open Source Reinforcement Learning Platforms](https://www.analyticsvidhya.com/blog/2016/12/getting-ready-for-ai-based-gaming-agents-overview-of-open-source-reinforcement-learning-platforms/)
3. Vidhya on [Simple Beginner’s guide to Reinforcement Learning & its implementation](https://www.analyticsvidhya.com/blog/2017/01/introduction-to-reinforcement-learning-implementation/)
4. ZipRecruiter on [Classifying Job Titles With Noisy Labels Using REINFORCE ](https://medium.com/@ziprecruiter.engineering/classifying-job-titles-with-noisy-labels-using-reinforce-ce1a4bde05e2)- Fine-grained job title classification with noisy labels using the REINFORCE algorithm and multi-task learning

   -> this article has a very nice trick in adding a reward component to the loss function in order to mitigate for unbalanced class label problem, instead of the usual balancing.
5. David Silver - [Home Page](https://www.davidsilver.uk/teaching/) - [1](https://www.youtube.com/watch?v=2pWv7GOvuf0) [2](https://www.youtube.com/watch?v=lfHX2hHRMVQ) [3](https://www.youtube.com/watch?v=Nd1-UUMVfz4) [4](https://www.youtube.com/watch?v=PnHCvfgC_ZA) [5](https://www.youtube.com/watch?v=0g4j2k_Ggc4) [6](https://www.youtube.com/watch?v=UoPei5o4fps) [7](https://www.youtube.com/watch?v=KHZVXao4qXs) [8](https://www.youtube.com/watch?v=ItMutbeOHtc) [9](https://www.youtube.com/watch?v=sGuiWX07sKw) [10](https://www.youtube.com/watch?v=kZ_AUmFcZtk)\
   ![](/files/n5qY5uZChFsGLQDAi6ER)
6. [Sequential Decision Analytics and Modeling](https://castle.princeton.edu/sdamodeling/) book

### **Q-LEARN**

* **Markov chain problem, (state, action, new state, reward)**
* **Lots of Exploration in the beginning, then exploitation** 
* **Returns optimal policy.**
* **Refer to youtube** [**here**](https://www.youtube.com/watch?v=9m_6q_KECTk)

### **Deep Learning**

1. [A review paper about RL in DL](https://arxiv.org/pdf/1701.07274.pdf)
2. [deep Q-learning](https://www.analyticsvidhya.com/blog/2019/04/introduction-deep-q-learning-python/)
3. Pytorch
   1. [DQN](https://pytorch.org/tutorials/intermediate/reinforcement_q_learning.html)
   2. [PPO](https://pytorch.org/tutorials/intermediate/reinforcement_ppo.html)
   3. [Mario example](https://pytorch.org/tutorials/intermediate/mario_rl_tutorial.html)

## RLHF

1. [illustrated RLHF by Huggingface](https://huggingface.co/blog/rlhf)


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