The h2o package has been used to fit a NN to the famous iris data. The figure plots the predicted class probabilities vs the petal length variable (with other variables fixed at their means).

Why do you think the x axis shows petal length values that range from -1.5 to 1.5?

0.8 0.6 Species: Setosa Probability - - - Species: Versicolor . . ... Species: Virginica 0.4 0.2 0.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 Petal lengthA. Numeric variables are typically standardised. B. The values have been adjusted for the other variables. C. Perhaps the axis has been incorrectly labelled and it is some other variable. D. There must be an error