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LoRAs

A LoRA is a small trained add-on that teaches a base model one specific thing without retraining it: a particular face, a visual style, a concept the base model does not know.

They attach to a production design, which means they apply to everything that design generates.

What a LoRA is, and when to use one

The concept, what it's genuinely good at, and the cheaper things to try first.

Sources, weights and combining

Where LoRAs come from, tuning weight, and what happens when you stack them.