The dangerous fine-tuning failures are not the ones that raise an exception. They are the ones where the run completes, the loss curve looks plausible and the model is quietly wrong — and the way to catch those is to know what each failure mode looks like from the outside. Failures that crash Out of memory partway through, not at the start A run that survives a thousand steps and then raises CUDA out of memory did not gradually leak. It met the longest sequence in ...