Missing painter code

Thank you for the work.

According to the tutorial here, there should be a painter code under utils.py: https://colab.research.google.com/drive/1Te46XVWtHsdizAs3cBuXLw7ab5_cjsE7#scrollTo=UJ8YMaA9XnIg

However, the painter code is not in the current repo.

Could you please upload the painter code?

Many thanks!