7.12 kmeans visualise two variables

20220226 Where two variables are input to the clustering, the visualisation will be more natural for us in two dimensions.

To illustrate, use a pipeline with mlr to extract the two columns from the original training dataset. The training dataset is saved using tee so that it can be used later if need be (as it is here). The data is then piped through train , predict, and visualise.

cat iris.csv |
    mlr --csv cut -f sepal_length,sepal_width |
    tee iris_2.csv |
    ml train kmeans 3 |
    ml predict kmeans iris_2.csv |
    ml visualise kmeans -o kmeans_iris_pr_vis_2.png

The resulting plot, indicating the three clusters identified, will be displayed:

In this particular example, observe how the clustering is still apparently based on sepal_length.



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