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Inference

What is inference?

Inference is running a trained model to produce output. It is where nearly all lifetime cost accumulates for a successful model, because training happens a handful of times and inference happens on every request forever.

The cost structure differs fundamentally from training. Training is a bounded job with a known end; inference is an open-ended commitment whose cost scales with product success.

This is the argument for optimising model size against your accuracy bar rather than against ambition. A model twice as large costs roughly twice as much on every request for the rest of its deployment.

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