This tutorial is an introduction to the deep reinforcement learning algorithm of Deep Q-Networks (DQN) using Tensorflow. It will cover the basic algorithm as well as how to implement it using Tensorflow.

For more information check out our video:

## Introduction

This tutorial is an extension of the TensorFlow getting started guide. It will teach you how to implement a Deep Q Network using TensorFlow. A Deep Q Network (DQN) is a specific type of neural network designed to play optimally in reinforcement learning environments.

##Heading: Requirements

##Expansion:

To follow this tutorial, you need:

-TensorFlow >0.12 installed on your system. You can install it from here.

-A basic understanding of machine learning and neural networks. If you’re new to this field, we recommend that you take a look at our beginner’s guide to machine learning.

-Knowledge of Python. This tutorial uses Python 3.5.

## What is TensorFlow?

TensorFlow is a powerful, open-source software library for data analysis and machine learning. Originally developed by researchers and engineers working on the Google Brain team within Google’s Machine Intelligence research organization, TensorFlow is now used by many companies all over the world.

## What is a DQN?

A Deep Q Network (DQN) is a type of artificial intelligence algorithm that is used to learn how to play games. It is a reinforcement learning algorithm that is similar to Q-learning, but with the ability to handle large state spaces and non-linear relationships.

## Why use TensorFlow for a DQN?

There are a number of reasons why you might want to use TensorFlow for your DQN. First, it’s a powerful framework that can provide you with all the tools you need to build and train your DQN. Second, it’s easy to use, which means you can get started quickly. Third, TensorFlow has excellent documentation, which means you can find all the information you need to get started. Finally, TensorFlow is open source, which means you can use it for free.

## How to get started with TensorFlow

TensorFlow is an open-source software library for machine learning. It was originally developed by researchers and engineers working on the Google Brain team within Google’s Machine Intelligence research organization for the purposes of conducting machine learning and deep neural networks research, but the system is general enough to be applicable in a wide variety of other domains as well.

This tutorial will show you how to get started with TensorFlow so that you can begin building and working with your own models. We’ll cover the basics of installing TensorFlow, creating your first model, and running it on some data. By the end of this tutorial, you’ll have a good understanding of how TensorFlow works and be able to start building your own models.

## How to create a DQN in TensorFlow

Deep Q-Networks (DQN) are a type of neural network used to approximate the Q-function. In reinforcement learning, the Q-function is used to map states to action values, so that the agent can choose the best possible action in any given state. DQNs are well-suited to approximating the Q-function because they can handle complex, high-dimensional state spaces.

TensorFlow is a powerful open-source software library for machine learning, and it offers a great platform for developing and training DQNs. In this tutorial, we’ll show you how to create a DQN in TensorFlow. We’ll also provide some tips for training and deploying your DQN.

##Creating a DQN in TensorFlow

The first step in creating a DQN is to define the network architecture. We’ll need to specify the number of input nodes, hidden nodes, and output nodes. For this tutorial, we’ll use a simple network with one hidden layer and an output layer.

Next, we need to create the weights and biases for our network. We can use the tf.Variable class to create variables that can be modified during training. For example, we might create a weight variable like this:

weight = tf.Variable(tf.zeros([input_nodes, hidden_nodes]))

bias = tf.Variable(tf.zeros([hidden_nodes]))

## How to train a DQN in TensorFlow

Deep Q Networks (DQN) are powerful function approximators that can be used to learn policies for reinforcement learning tasks. In this tutorial, we’ll be using the Keras sequential API to train a DQN on the CartPole environment from OpenAI Gym. We’ll also be using TensorFlow 2.0 in this tutorial.

## How to use a DQN in TensorFlow

Deep Q-Networks (DQN) are a popular algorithm used in Deep Reinforcement Learning. In this tutorial, we’ll be using a DQN to solve the classic CartPole problem.

We’ll be using TensorFlow and the open source gym library to implement our DQN. If you’re not familiar with either of these libraries, don’t worry – we’ll walk through all the necessary code step-by-step. By the end of this tutorial, you’ll have a solid understanding of how to use DQNs to solve complex problems.

## Conclusion

We have now seen how to implement a Deep Q-Network using TensorFlow. We have also seen how to combine it with an experience replay memory to stabilize learning.

There are many ways to improve upon the basic DQN algorithm we have implemented here. Some ideas to try include:

– Prioritized Experience Replay: Giving more importance (i.e., higher probabilities of selection) to transitions which would result in a greater learning gain. This can be achieved by, instead of uniformly sampling from the replay memory, selecting batch_size transitions with the highest q-values (potential future rewards).

– Double DQN: Decoupling the selection of the best action from its evaluation by using two different estimators for these two distinct tasks. This helps prevent overoptimistic value estimates which can lead to poorer performance.

– N-step DQN: Making better use of information by concatenating multiple successive states together and using this as input into our DQN so as to estimate expected long-term rewards more accurately.

## Further Reading

If you are looking for more information on DQNs, the following resources may be helpful:

-Tensorflow’s Deep Q-Network tutorial: https://www.tensorflow.org/tutorials/dqn

-DeepMind’s Nature paper on DQNs: https://storage.googleapis.com/deepmind-media/dqn/DQNNaturePaper.pdf

-Berkeley’s CS188 course on AI, which goes over Q-learning in detail: http://ai.berkeley.edu/course_schedule.html

Keyword: Tensorflow DQN Tutorial – Getting Started