While I try to convert jupyter notebook to html, I found that some input cells are missing.
When I check it in github, notebook display that input cell correctly. But in the webpage, that cell is missing, and only output is displayed.
That special comment means the cell is exported - at least as far as the convert to html is concerned.
You could change to “## Export with dot” or maybe remove the comment. For me the code says you’re exporting the chosen tree to a dot file so - at the risk of sounding too opinionated - the comment doesn’t add anything.