CommencerCommencer gratuitement

Introduce a margin in the dataset

Your final task for Chapter 1 is to create a margin in the dataset that you generated in the previous exercise and then display the margin in a plot. The ggplot2 library has been preloaded for you. Recall that the slope of the linear decision boundary you created in the previous exercise is 1.4.

Cet exercice fait partie du cours

Support Vector Machines in R

Afficher le cours

Instructions

  • Introduce a margin delta of 0.07 units in your dataset.
  • Replot the dataset, displaying the margin boundaries as dashed lines and the decision boundary as a solid line.

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

#set margin
delta <- ___

# retain only those points that lie outside the margin
df1 <- df[abs(1.4*df$x1 - df$x2) > delta, ]

#build plot
plot_margins <- ggplot(data = df1, aes(x = x1, y = x2, color = y)) + geom_point() + 
    scale_color_manual(values = c("red", "blue")) + 
    geom_abline(slope = ___, intercept = 0)+
    geom_abline(slope = ___, intercept = ___, linetype = "dashed") +
    geom_abline(slope = ___, intercept = ___, linetype = "dashed")
 
#display plot 
plot_margins
Modifier et exécuter le code