Code for SVR in R is much more succinct than for this model in Python.
Decision Tree Regression
In Python:
Decision Tree Regression initially visualized as sloped segments, but increasing the resolution showed the desired stepped function visualization.
In R:
As in the Python tutorial for SVR, Decision Tree Regression initially visualized as a single horizontal average, but adding a command to forcibly increase the number of steps gave a more accurate tree. Similarly to the initial sloped segments issue for this model in Python, increasing ggplot resolution showed the desired stepped function visualization.
