[rfeather]

The point about hacking away at the code needs to be couched heavily. It's too easy to conclude you've got negative or positive results when what you really have is a silly little bug. The lack of focus on implementation skills in data (or even "real" science) is frightful. The one take away anyone trained in software engineering could share is that if you aren't very sure if it is working as intended, it's very likely not. Code review is very applicable here when making major pivots, even if unit or other testing is decidedly too time consuming for the train test improve loop.

Edit: typo "of" to "if". Somewhat serendipitous if you think about it.