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Your training loss is oscillating, plateauing, or diverging. How do you debug it?

'The model won't train' has a short list of usual suspects, each with a distinctive loss-curve signature. The shape of the curve names the bug before you touch a single hyperparameter. Here is how to read it.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

'The model won't train' has a short list of usual suspects, each with a distinctive loss-curve signature. The shape of the curve names the bug before you touch a single hyperparameter. Here is how to read it.

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