Computational Intelligence

198 Chapter Six—Neural Network Implementations

here is to discriminate the species according to the feature vectors. This is a

well-known three-class classification problem. Three of the 150 four-dimensional

vectors are listed here as examples:

0.637500 0.437500 0.175000 0.025000 1 0 0

0.875000 0.400000 0.587500 0.175000 0 1 0

0.787500 0.412500 0.750000 0.312500 0 0 1

In each row, the first four elements correspond to the sepal length, sepal width,

petal length, and petal width; the last three columns correspond to the three

species, Iris sectosa, Iris versicolor, and Iris virginica, respectively. Value 0 means

the feature vector doesn’t belong to this ...