Usually functions are named based on what they do. However, if you want to understand the functions you should open plt_logistic_loss.py and go through all the helper functions. If plt_logistic_loss.py is used in an assignment (either graded or ungraded) the Jupyter notebook will explain what they’re supposed to do. If you’re not satisfied with the explanation and want to view the python script, click File → Open - find and click plt_logistic_loss.py to view the source code.