What is adapter in new FOundation Model from wwdc25?

In the new Foundation Model introduced at WWDC25, an "adapter" is a small collection of model weights that can be overlaid onto a common base foundation model. This allows the model to specialize itself dynamically for specific tasks. Adapters can be loaded and swapped as needed, making it an efficient way to scale the capabilities of the foundation model. Apple provides a broad set of adapters, each fine-tuned for a specific feature, which helps in efficiently fine-tuning the model for various tasks without needing to retrain the entire model. This approach is part of Apple's strategy to optimize the model for performance and efficiency on Apple devices.

For more details, you can refer to the session Platforms State of the Union (00:03:50).