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Your large-model pretraining hits sudden loss spikes that don't recover. How do you stabilize it?

At billion-parameter scale, training can be cruising and then the loss jumps and never comes back, burning a fortune in compute. The causes and the playbook are well-known to the few who've done it. Here it is.

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

At billion-parameter scale, training can be cruising and then the loss jumps and never comes back, burning a fortune in compute. The causes and the playbook are well-known to the few who've done it. Here it is.

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