Deep Q Learning is Simple with Keras | Tutorial | Summary and Q&A

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July 15, 2019
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Machine Learning with Phil
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Deep Q Learning is Simple with Keras | Tutorial

TL;DR

Learn how to code and train a deep Q-network in Keras to beat the Lunar Lander environment in just 150 lines of code.

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Key Insights

  • 😆 The implementation of a deep Q-network in Keras requires importing essential libraries and creating a replay buffer class to handle memory storage.
  • 🏛️ The DQN model is built using the sequential object in Keras, with dense layers for fully connected operations and activation layers to apply activation functions.
  • ❓ The training process involves choosing actions using an epsilon-greedy approach and learning from state transitions using a temporal difference learning method.
  • ⌛ Gradually decreasing epsilon over time helps balance exploration and exploitation in the agent's training.
  • 👾 The agent's performance is evaluated using a running average of scores over a specific number of games.

Transcript

what's up everybody in this video you are gonna code a deep Q network in Carris and we're gonna beat the lunar lander environment and under 150 lines of code it's gonna be easier than you think and you're gonna see how easy right now so Karis has a number of imports we want to import the dents and activation layers to handle the fully connected as ... Read More

Questions & Answers

Q: What is the purpose of the replay buffer class?

The replay buffer class handles the storage of state-action-reward-state transition tuples, allowing the agent to learn from past experiences.

Q: How does the agent choose an action?

The agent uses an epsilon-greedy approach, randomly choosing actions with probability epsilon and selecting the action with the highest Q-value otherwise.

Q: How is the DQN model built in Keras?

The sequential object in Keras is used to construct a sequence of layers, including dense layers for fully connected operations, and activation layers for applying activation functions.

Q: What is the purpose of the epsilon decrement factor?

The epsilon decrement factor is used to gradually decrease epsilon over time, allowing the agent to exploit its learned knowledge more as training progresses.

Summary & Key Takeaways

  • This video focuses on implementing a deep Q-network (DQN) in Keras to train an agent to beat the Lunar Lander environment.

  • The code includes importing necessary libraries, creating a replay buffer class to handle memory storage, building the DQN model, and implementing functions for choosing actions and learning from state transitions.

  • The agent is trained using a temporal difference learning method, gradually decreasing epsilon to balance exploration and exploitation.

  • The performance of the agent is tracked using a running average of scores over 100 games.

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