Book Image

Python: Advanced Guide to Artificial Intelligence

By : Giuseppe Bonaccorso, Rajalingappaa Shanmugamani
Book Image

Python: Advanced Guide to Artificial Intelligence

By: Giuseppe Bonaccorso, Rajalingappaa Shanmugamani

Overview of this book

This Learning Path is your complete guide to quickly getting to grips with popular machine learning algorithms. You'll be introduced to the most widely used algorithms in supervised, unsupervised, and semi-supervised machine learning, and learn how to use them in the best possible manner. Ranging from Bayesian models to the MCMC algorithm to Hidden Markov models, this Learning Path will teach you how to extract features from your dataset and perform dimensionality reduction by making use of Python-based libraries. You'll bring the use of TensorFlow and Keras to build deep learning models, using concepts such as transfer learning, generative adversarial networks, and deep reinforcement learning. Next, you'll learn the advanced features of TensorFlow1.x, such as distributed TensorFlow with TF clusters, deploy production models with TensorFlow Serving. You'll implement different techniques related to object classification, object detection, image segmentation, and more. By the end of this Learning Path, you'll have obtained in-depth knowledge of TensorFlow, making you the go-to person for solving artificial intelligence problems This Learning Path includes content from the following Packt products: • Mastering Machine Learning Algorithms by Giuseppe Bonaccorso • Mastering TensorFlow 1.x by Armando Fandango • Deep Learning for Computer Vision by Rajalingappaa Shanmugamani
Table of Contents (31 chapters)
Title Page
About Packt
Tensor Processing Units

Naive Neural Network policy for Reinforcement Learning

We proceed with the policy as follows:

  1. Let us implement a naive neural network-based policy. Define a new policy to use the neural network based predictions to return the actions:
def policy_naive_nn(nn,obs):
return np.argmax(nn.predict(np.array([obs])))
  1. Define nn as a simple one layer MLP network that takes the observations having four dimensions as input, and produces the probabilities of the two actions:
from keras.models import Sequential
from keras.layers import Dense
model = Sequential()
model.add(Dense(8,input_dim=4, activation='relu'))
model.add(Dense(2, activation='softmax'))

This is what the model looks like:

Layer (type)                 Output Shape              Param #   
dense_16 (Dense)             (None, 8)                 40