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You're reading from  Hands-On Machine Learning with Microsoft Excel 2019

Product typeBook
Published inApr 2019
PublisherPackt
ISBN-139781789345377
Edition1st Edition
Tools
Excel
Concepts
Machine Learning
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Author (1)
Julio Cesar Rodriguez Martino
Julio Cesar Rodriguez Martino
author image
Julio Cesar Rodriguez Martino

Julio Cesar Rodriguez Martino is a machine learning (ML) and artificial intelligence (AI) platform architect, focusing on applying the latest techniques and models in these fields to optimize, automate, and improve the work of tax and accounting consultants. The main tool used in this practice is the MS Office platform, which Azure services complement perfectly by adding intelligence to the different tasks. Julio's background is in experimental physics, where he learned and applied advanced statistical and data analysis methods. He also teaches university courses and provides in-company training on machine learning and analytics, and has a lot of experience leading data science teams.
Read more about Julio Cesar Rodriguez Martino

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Understanding the backpropagation algorithm

There are two phases in the training process of a deep neural network: forward and back propagation. We have seen the forward phase in detail:

  1. Calculate the weighted sum of the inputs:
  1. Apply the activation function to the result:
Find different activation functions in the suggested reading at the end of the chapter. The sigmoid function is the most common and is easier to use, but not the only one.
  1. Calculate the output by adding all the results from the last layer (N neurons):

After the forward phase, we calculate the error as the difference between the output and the known target value: Error = (Output-y)2.

All weights are assigned random values at the beginning of the forward phase.

The output, and therefore the error, are functions of the weights wi and θi. This means that we could go backward from the error and see...

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Hands-On Machine Learning with Microsoft Excel 2019
Published in: Apr 2019Publisher: PacktISBN-13: 9781789345377
© 2019 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Julio Cesar Rodriguez Martino

Julio Cesar Rodriguez Martino is a machine learning (ML) and artificial intelligence (AI) platform architect, focusing on applying the latest techniques and models in these fields to optimize, automate, and improve the work of tax and accounting consultants. The main tool used in this practice is the MS Office platform, which Azure services complement perfectly by adding intelligence to the different tasks. Julio's background is in experimental physics, where he learned and applied advanced statistical and data analysis methods. He also teaches university courses and provides in-company training on machine learning and analytics, and has a lot of experience leading data science teams.
Read more about Julio Cesar Rodriguez Martino

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