INAOE. Dra. Ma. del Pilar Gómez Gil. Tutorial An Introduction to the Use of Artificial Neural Networks. Part 4: Examples using Matlab
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1 Tutorial An Introduction to the Use of Artificial Neural Networks. Part 4: Examples using Matlab Dra. Ma. del Pilar Gómez Gil INAOE This version: October 13,
2 Outline Duration Duration Topic Topic Sub-topics Sub-topics 1 hour 1. Artificial Neural Networks. 0.5 hours 1. What Artificial is that? Neural Networks. What is that? 1.1 Some definitions Some Advantages definitions. and drawbacks of 1.2 ANN. Advantages and drawbacks of ANN. 1.3 Characteristics of solutions 1.3 using Characteristics ANN. of solutions using 1.4 The ANN. fundamental neuron. 1.5 The concept of learning by 2.2 examples The concept of learning by examples Some Single ANN layer architectures. perceptron 2.4 network Examples using composed architectures 2.3 Multi-layer of Perceptrons ANN 2 hours 2. Basic concepts 2.1 The fundamental neuron. 1 hour 2. Basic architectures 2.1 Types of ANN 0.5 hours 3. Solutions using ANN 3.1 ANN as classifiers 1 hour 3. Solutions using ANN 3.1 ANN as classifiers 1 hour hour Examples Examples using using Matlab Matlab ANN ANN toolbox toolbox 3.2 ANN as function approximators. 3.2 ANN as a function 3.3 approximator. ANN as predictors 3.3 ANN as predictors 4.1 very simple classifier. 4.1 A very simple classifier. 4.2 very simple function 4.2 A very simple function approximator. approximator. 2
3 Basic Examples In this last part of the tutorial, we present a basic way to use a multi-layer perceptron as a classifier and as a function aproximator. Examples are shown using the ANN Matlab toolbox 3
4 Matlab and ANN Matlab is a language of technical computing, developed by Mathworks The Neural Network toolbox is part of the products offered for Statistics and Data Analysis (see figure next), used to design and simulate neural networks, based on Matlab This tool is very popular. It offers support for several architectures of NN and a GUI to design and maintain a neural net. A detailed description of this toolbox may be found at 4
5 Source: 5
6 Basic Concepts to use the toolbox There are 4 main steps to do: 1. Get the data to be used 2. Define the network 3. Train the network 4. Using and assessing the performance of the network After that, the network is ready to be used. 6
7 Matlab representation of a perceptron [Demuth &Mark Beale
8 Popular transfer function used at toolbox [Demuth &Mark Beale
9 NN Toolbox representation of a MLP There is one hidden and one output layer 9
10 See code classifierv4.m 10
11 A very simple classifier 11
12 Classifying 5 types of 2-D points CLASE MU SIGMA
13 Característica y Classifying 5 types of 2-D points (cont.) Patrones de 5 clases Clase 1 Clase 2 Clase 3 Clase 4 Clase Característica x 13
14 Classifying 5 types of 2-D points (cont.) 14
15 Classifying 5 types of 2-D points (cont.) Confusion matrix using training data (expected,real) confusion = Performance: % Error: 0.00 % Confusion matrix using testing data (expected,real) confusion = Generalization performance: % Error: 3.33 % 15
16 A very simple function approximator 16
17 f ( x 1,..., x m ) Approximating a function [Mendoza & Gómez-Gil 2009] A MLP with m inputs, one hidden layer with h neurons and one output layer with one neuron is able to approximate a function f x,..., x ) ( 1 m h m 1, x2... xm ) j ( w jixi b j ) j 1 i 1 F( x 17
18 Approximating a function (cont.) Activation function for hidden nodes: x 1 ( u) 1 1 e u 1 x i x m... w ji.. j h F Activation function for node in output layer: ( x) x 18
19 Example: learning a parabolic function See program funaprox.m 450 aproximation using training data as inputs 450 aproximation using testing data as inputs
20 References Howard Demuth &Mark Beale. Neural Networks toolbox to use with Matlab. User Guide, Version 4. Mathworks, 2001 Mendoza Velázquez A, Gómez-Gil P. Herramientas para el Pronóstico de la Calificación Crediticia de las Finanzas Públicas Estatales en México: Redes Neuronales Artificiales, Modelo Probit Ordenado y Análisis Discriminante Premio Nacional Bolsa Mexicana de Valores Disponible en: %20pronostico%20de%20la%20Calificacion%20Crediticia.pdf 20
21 Dra. Ma. del Pilar Gómez Gil ccc.inaoep.mx/~pgomez 21
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