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An Introduction to Reinforcement Learning with Amazon SageMaker
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An Introduction to Reinforcement Learning with Amazon SageMaker
1.
© 2018, Amazon
Web Services, Inc. or its Affiliates. All rights reserved. Julien Simon Principal Technical Evangelist, AI & Machine Learning, AWS @julsimon An Introduction to Reinforcement Learning
2.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Supervised learning Run an algorithm on a labelled data set, i.e. a data set containing samples and answers. Gradually, the model learns how to correctly predict the right answer. Regression and classification are examples of supervised learning. Unsupervised learning Run an algorithm on an unlabelled data set, i.e. a data set containing samples only. Here, the model progressively learns patterns in data and organizes samples accordingly. Clustering and topic modeling are examples of unsupervised learning. Types of Machine Learning
3.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Supervised learning Unsupervised learning Types of Machine LearningSOPHISTICATIONOFMLMODELS AMOUNT OF TRAINING DATA REQUIRED
4.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Types of Machine Learning AMOUNT OF TRAINING DATA REQUIRED Supervised learning Unsupervised learning SOPHISTICATIONOFMLMODELS
5.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Types of Machine Learning Reinforcement learning (RL) Supervised learning Unsupervised learning AMOUNT OF TRAINING DATA REQUIRED SOPHISTICATIONOFMLMODELS
6.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Remember when you first learned this?
7.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Or this?
8.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. We didn’t have an extensive labelled data set back then ☺ And yet we learned How?
9.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Defining Reinforcement Learning An algorithm (aka an agent) interacts with its environment. The agent receives a positive or negative reward for actions that it takes: rewards are computed by a user-defined function which outputs a numeric representation of the actions that should be incentivized. By trying to maximize the accumulation of rewards, the agent learns an optimal strategy (aka policy) for decision making. Source: Wikipedia
10.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Use cases • Large complex problems • Uncertain, dynamic environments • Continuous learning • Supply chain management • HVAC systems • Industrial robotics • Autonomous vehicles • Portfolio management • Oil exploration • etc. Caterpillar: 250-ton autonomous mining trucks https://diginomica.com/2017/04/17/sending-disruption-mines/ https://www.cat.com/en_US/articles/customer-stories/built-for-it/thefutureisnow-driverless.html
11.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Example: navigating a maze • Imagine an agent learning to navigate a maze. It can move in certain directions but is blocked from going through walls. • The agent discovers its environment (the current maze) one step at at time, receiving a reward each time: stepping into a dead end is a negative reward, moving one step closer to the exit is a positive reward. • After a certain number of steps (or if we found the exit), the current episode ends. • After a certain number of episodes, the agent uses the action/reward data points to train a model, in order to make better decisions next time around. • One critical thing to understand is that the RL model isn’t trained on a predefined set of labelled mazes (that would be supervised learning). • This cycle of exploring and training is central to RL: given enough mazes and enough training time, we would soon enough know how to navigate any maze.
12.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Environment • The space in which the RL model operates. • This can be either a real-world environment or a simulator. • If you train a physical autonomous vehicle on a physical road, that would be a real- world environment. • If you train a computer program that models an autonomous vehicle driving on a road, that would be a simulator… probably a much safer option!
13.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Exploitation vs Exploration • Selecting the next action is a balance between exploitation (‘using what you’ve learned’) and exploration (‘taking a chance to learn new things’) • If you favor exploitation, you may never reach high-value rewards. • If you favor exploration, you’ll probably run into trouble very often! • Initially, the agent will explore at random for a fixed number of episodes (aka heatup phase): this generates data for the first round of training.
14.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Training a RL model 1. Formulate the problem: goal, environment, state, actions, reward 2. Define the environment: real-world or simulator? 3. Define the presets 4. Write the training code and the value function 5. Train the model
15.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Amazon SageMaker RL Reinforcementlearningfor every developer and data scientist Broad support for frameworks Broad support for simulation environments including SimuLink and MatLab K E Y F E AT U R E S TensorFlow, Apache MXNet, Intel Coach, and Ray RL support 2D & 3D physics environments and OpenAI Gym support Supports Amazon Sumerian and Amazon RoboMaker Fully managed Example notebooks and tutorials
16.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved.
17.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved.
18.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved.
19.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved.© 2018, Amazon Web Services, Inc. or its affiliates. All rights reserved.
20.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. How can we get developers rolling with reinforcement learning?
21.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Introducing AWS DeepRacer Fullyautonomous1/18thscaleracecar, drivenbyreinforcementlearning https://youtu.be/X-6v4RZy-TE HD video camera Dual-core Intel processorFour-wheel drive Dual power for compute and drive Accelerometer Gyroscope © 2018, Amazon Web Services, Inc. or its affiliates. All rights reserved.
22.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. AWS DeepRacer
23.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. AWS DeepRacer League Competitive racing league for AWS DeepRacer Compete virtually onlineTrain models with RL Race in trials Final at AWS re:Invent
24.
© 2018, Amazon
Web Services, Inc. or its affiliates. All rights reserved. Getting started http://aws.amazon.com/free https://ml.aws https://aws.amazon.com/sagemaker https://aws.amazon.com/deepracer/ https://github.com/aws/sagemaker-python-sdk https://github.com/awslabs/amazon-sagemaker-examples https://medium.com/@julsimon https://gitlab.com/juliensimon/dlnotebooks
25.
Thank you! © 2018,
Amazon Web Services, Inc. or its affiliates. All rights reserved. Julien Simon Principal Technical Evangelist, AI & Machine Learning, AWS @julsimon