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[enhancement]: LoRA support for Ideogram 4 #9740

Description

@Pfannkuchensack

Is there an existing issue for this?

  • I have searched the existing issues

What should this feature add?

Load and apply LoRAs for Ideogram 4. Today there is no LoRA config for base ideogram-4, and the LoRA loader raises
"Unsupported LoRA base model" (invokeai/backend/model_manager/load/model_loaders/lora.py), so community LoRAs
for this family cannot be installed or used.

Alternatives

None within InvokeAI.

Additional Content

Needs a LoRA config (LyCORIS/kohya and, where published, diffusers/PEFT key layouts), a key converter to the
model's module names, patching in the denoise node (sidecar patching for quantized and GGUF builds), and a LoRA
slot in Generate.

The full matrix of what loads today is in #9726 (Model Format Support page).

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