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abstract indexed · arXiv 2609.25373 · updated 2026-10-18

Extending FunctionGemma for Practical On-Device Mobile Function Calling

First page of Extending FunctionGemma for Practical On-Device Mobile Function Calling
From the original paper · arXiv 2609.25373Page 1. Select the image to read the PDF.

The method replaces prompting a large general-purpose LLM (or using a narrow specialist) for mobile function calling with supervised fine-tuning of a 270M model on a schema-validated synthetic dataset of ~9,500 conversations covering fifteen Android control categories. Cost is modest: SFT of a 270M model with completion-only loss fits on a single 24 GB GPU, and the released dataset and pipeline reduce data-engineering effort; the trade-off is the 8.0-point accuracy loss on Google's benchmark when combining both datasets. It can fail on user requests outside the fifteen trained categories, on schema drift between training and deployment, and because a fully synthetic dataset may not represent real user phrasing, so validation on actual target workflows is required.

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Fine-tuned 270M specialist for on-device function calling
published
2026-09-21

A 270M fine-tuned model is cheap to train and serve on constrained infrastructure, the artifacts are released, and the accuracy gain over the base model is large enough to justify adoption for mobile or embedded function-calling use cases.

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    The method replaces prompting a large general-purpose LLM (or using a narrow specialist) for mobile function calling with supervised fine-tuning of a 270M model on a schema-validated synthetic dataset of ~9,500 conversations covering fifteen Android control categories. Cost is modest: SFT of a 270M model with completion-only loss fits on a single 24 GB GPU, and the released dataset and pipeline reduce data-engineering effort; the trade-off is the 8.0-point accuracy loss on Google's benchmark when combining both datasets. It can fail on user requests outside the fifteen trained categories, on schema drift between training and deployment, and because a fully synthetic dataset may not represent real user phrasing, so validation on actual target workflows is required.

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  2. claim 02Paperraft inference

    End-to-end function-calling accuracy rises from 29.3% (base FunctionGemma 270M) to 76.5% on MOBILEACTIONSEXTENDED; the combined model reaches 82.3% on MOBILEACTIONSGOOGLE, an 8.0-point drop versus Google's specialist.

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