A training run from three months ago cannot be reproduced. Same code, same data, different result. Where does the difference come from?

Code and data are the two things people pin, and they are rarely the two things that changed. The driver, the framework build, the kernel selection and the data ordering all vary underneath a pinned repository.

Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.