Any proper code editor will send you to the function definition. For instance in VS code, you just have to press F12.
If you are in a notebook, typing the name of a function in a cell will tell you where it comes from. Since it’s a fastai function, typing show_doc(one_param) will pop the documentation with a link to the source code.
That’s fair. I was exploring it through github as I often do. I will definitely keep it in mind that it’s expected to be understood in the context of a proper ide.