Download e-book for iPad: Mastering Probabilistic Graphical Models using Python by Ankur Ankan, Abinash Panda

By Ankur Ankan, Abinash Panda

ISBN-10: 1784394688

ISBN-13: 9781784394684

Master probabilistic graphical versions by means of studying via real-world difficulties and illustrative code examples in Python

About This Book

  • Gain in-depth wisdom of Probabilistic Graphical Models
  • Model time-series difficulties utilizing Dynamic Bayesian Networks
  • A useful advisor that will help you practice PGMs to real-world problems

Who This e-book Is For

If you're a researcher or a computing device studying fanatic, or are operating within the information technology box and feature a easy thought of Bayesian studying or probabilistic graphical types, this ebook might help you to appreciate the main points of graphical types and use them on your information technology problems.

What you are going to Learn

  • Get to grasp the fundamentals of likelihood concept and graph theory
  • Work with Markov networks
  • Implement Bayesian networks
  • Exact inference concepts in graphical types reminiscent of the variable removal algorithm
  • Understand approximate inference innovations in graphical versions corresponding to message passing algorithms
  • Sampling algorithms in graphical models
  • Grasp information of Naive Bayes with real-world examples
  • Deploy probabilistic graphical types utilizing quite a few libraries in Python
  • Gain operating information of Hidden Markov versions with real-world examples

In Detail

Probabilistic graphical types is a method in laptop studying that makes use of the innovations of graph conception to concisely signify and optimally are expecting values in our facts problems.

Graphical versions provides us thoughts to discover complicated styles within the info and are ordinary within the box of speech reputation, info extraction, photo segmentation, and modeling gene regulatory networks.

This ebook begins with the fundamentals of chance idea and graph thought, then is going directly to speak about a number of versions and inference algorithms. the entire types of types are mentioned in addition to code examples to create and alter them, and likewise run assorted inference algorithms on them. there's a whole bankruptcy that is going directly to conceal Naive Bayes version and Hidden Markov types. those types were completely mentioned utilizing real-world examples.

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Extra info for Mastering Probabilistic Graphical Models using Python

Sample text

These are similar to the Bayesian network, in the sense that we represent all the random variables in the form of nodes, but we represent the dependencies or interaction between these random variables with an undirected edge. Before we go into the representation of these models, we need to think about the parameterization of these models. In the Bayesian network, we had a CPD P( X i | Par (X i )) associated with every node X i . As we don't have any directional influence or a parent-children relationship in the case of the Markov network, instead of using CPDs, we use a more symmetric representation called factor, which basically represents how likely it is for some states of a variable to agree with the states of other variables.

Now, the probability of an accident increases, which is what we had expected. As we can see that before the observation of the traffic jam, both the random variables, heavy rain and traffic accident, were independent of each other, but with the observation of their common children, they are now dependent on each other. This type of reasoning is called as intercausal reasoning, where different causes with the same effect influence each other. [ 21 ] Bayesian Network Fundamentals D-separation In the last section, we saw how influence flows in a Bayesian network, and how observing some event changes our belief about other variables in the network.

The elements of the set V 2 are known as the nodes or the vertices of the graph, and the elements of E ⊆ V are the edges or the arcs of the graph. The number of nodes or cardinality of G, denoted by |V|, are known as the order of the graph. Similarly, the number of edges denoted by |E| are known as the size of the graph. 1 is of order 4 and size 7. In a graph, we say that two vertices, u, v ϵ V are adjacent if u, v ϵ E. In the City graph, all the four vertices are adjacent to each other because there is an edge for every possible combination of two vertices in the graph.

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Mastering Probabilistic Graphical Models using Python by Ankur Ankan, Abinash Panda

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