Other things to know about MOJOs

You are now ready to deploy MOJOs, with or without required wrappers, as articulated in the previous section. Let's round up our knowledge of MOJOs by addressing the following secondary topics.

Inspecting MOJO decision logic

For tree-based models, you can use a utility built into h2o-genmodel.jar to generate a graphical representation of the tree logic in the MOJO. Here is how.

Let's use the same MOJO we used in the previous coding example of building a wrapper class. On the command line where your h2o-genmodel.jar is located, run the following:

java -cp h2o-genmodel.jar hex.genmodel.tools.PrintMojo \ 
-i "path/to/mojo" \
-o tree.png \
--format png \
--tree 0

This will create a .png file that looks like this:

Figure 9.7 – Output of the PrintMojo utility

Note that if you omitted --tree 0, you would have generated a folder holding a forest of all trees. We have specified to return...