Why Doesn’t My Model Work?

Have you ever trained a model you thought was good, but then it failed miserably when applied to real world data? If so, you’re in good company. Machine learning processes are complex, and it’s very easy to do things that will cause overfitting without it being obvious. In the 20 years or so that I’ve been working in machine learning, I’ve seen many examples of this, prompting me to write “How to avoid machine learning pitfalls: a guide for academic researchers” in an attempt to prevent other pe...